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CHAPTER ON FLY ASH FOR GRADUATE (CIVIL ENGINEERING) COURSE STUDENTS Subhash Chandra Sr Engineer AUD NTPC Limited Noida Office
Fly Ash – A Resource Material
1.Fly ash Introduction
1.1.General 1.2.Production and Classification 1.3.History of Fly Ash Utilization 1.4.Properties of Fly Ash 1.5.Geo-technical Properties 1.6.Chemical Properties 1.7.Quality of Fly Ash as per BIS, ASTM
2.Main avenues for use of fly ash
2.1Cement concrete and mortar 2.2Fill Material – Road and embankments construction 2.3Reclaim wasteland 2.4Mine filling 2.5Bricks, blocks and tiles Manufacturing 2.6Agricultural soil 2.7Ash Dykes 2.8Autoclaved Aerated Concrete 2.9Lightweight aggregates 2.10Cenosphere
3.Legal Issues – Ash Utilization
4.Major Successful examples
1Fly Ash Introduction 1.1General
The Fly ash word sounds its own definition i.e. material which flies along with gases and ash – a residue of burnt material. This name is used for residue of coal which is used as pulverized fuel for generation of electricity in thermal power station. In present life style electricity has become one of the most important part of day to day of human life. For generation of electricity coal is continued to be used as a major source of fuel in many countries in the World including India. In the process of electricity generation, large quantity of fly ash gets produced and becomes available as a by-product of coal-based power stations.
Fig. 1: Fly Ash mound Fig. 2: Fly Ash-microscopic view
1.2Production and Classification
In thermal power station, pulverized coal is fed into boiler furnace, after burning; the lighter and finer particles fly along with hot flue gases which are passed through Electrostatic Precipitators (ESP). In ESP these particles are arrested and then taken out either pneumatically to a storage silos in dry form or sluiced through with water and sent to ash ponds. The particles collected in ESP are called Fly Ash. It is then collected by either using electrostatic precipitators, baghouses or a combination of both.
There are four categories of Ash normally available from a coal based thermal power station. a.Fly Ash: This kind of ash is collected from different rows of Electro-Static Precipitators (ESP) in dry form. This is characterized by comparatively lower carbon content and higher fineness. Fineness of fly ash is more in subsequent field of ESP as compared to initial fields. This ash comprises about 80% of total ash produced in a station. b. Bottom Ash: This kind of ash is collected at the bottom of Boiler furnace as a result of coal burning activity. This is characterized by comparatively higher carbon content and coarse size. This comprises about 20% of total ash produced in a station. c.Pond Ash: The slurry formed after mixing ash with water is pumped to the nearby ash ponds wherein water gets drained away. The ash thus stored in ash ponds is called Pond Ash. d.Mound Ash: Fly ash conveyed in dry form and deposited dry in mounds.
1.3History of Fly Ash Utilization
Utilization of fly ash is not a new phenomenon rather it is about seven decades old. The fly ash became available in coal based thermal power station in the year 1930 in USA. In order to find out its properties, scientist started research activities and in the year 1937, R.E. Davis and his associates at university of California published research details on use of fly ash in cement concrete. This research had laid foundation for its specification, testing & usages. The research had established that fly ash possesses specific property called as pozzolanic property which was similar to volcanic ash and deserves to utilize in lime/ cement concrete works.
The pozzolanic property of a substance is defined as -A Siliceous or Siliceous and Aluminous material, which in itself possesses little or no cementitious value but will, in finely divided form and in the presence of moisture, chemically react with calcium hydroxide at ordinary temperatures to form compounds possessing cementitious properties.
The pozzolana term came from Roman city. About 2,000 years ago, Roman used volcanic ash along with lime and sand to produce mortars, which possesses superior strength characteristics & resistances to corrosive water. The best variety of this volcanic ash was obtained from the locality of pozzoli and thus the volcanic ash had acquired the name of Pozzolana. The investigations had also established that the geo-technical properties of fly ash are similar or better than many of the soils and can be utilized for structural fill & embankment construction substituting soil.
In India, to establish more uses of fly ash produced from Indian coal, research activities were continued at various research institutes of Council of Scientific and Industrial Research (CSIR) like Central Building Research Institute, Roorkee, Central Institute for Mining Fuel Research Institute, Dhanbad, Central Road Research Institute, New Delhi etc and other Institutes like National Council for Cement & Building Materials, Ballabhgarh, IIT Kanpur, IIT Chennai, NTPC (R&D)etc. Studies have revealed that fly ash can be used in manufacture clay ash bricks, fly ash lime/ cement bricks and other building products, in agriculture, road embankments construction and fill applications.
1.4Properties of Fly Ash
Fly ash is complex material having wide range of chemical, physical and mineralogical compositions. The chemical composition of fly ash depends on the type of coal burnt in boiler furnace, oil firing, oxygen flow temperature of furnace, degree of pulverization of coal, efficiency of ESP etc. Physical properties of fly ash such as fineness or particle size, reactivity with lime / cement etc depends on design and efficiency of boiler, combustion process, coal grinding techniques employed, process of ash collection and handling method and efficiency of Electrostatic Precipitator etc.
The majority of fly ash particles are glassy, solid or hollow, slightly to highly porous and spherical in shape. The specific gravity falls within the range of 2.1 to 2.6 and dry density is commonly found to be in the range of 950-1200 kg/m3 depending on the degree of compaction. The particle size of fly ash generally ranges from 1 micron to 100 micron in diameter of glassy spheres and 7 to 300 microns in diameter for angular carbon particles. In terms of soil grain size analysis, most fly ash particles fall within the silt range, with small percentages in the fine sand and clay sizes.
Table 1: Geo-technical properties of Fly Ash
Specific gravity g/cc1.90-2.55 PlasticityNon Plastic Proctor compaction – Maximum dry density (g/cc)0.90-1.60 Optimum moisture content (%)38.0-18.0 Angle of internal friction ( o)300-400 Cohesion (kg/cm2 )Negligible Compression index0.05-0.4 Permeability (cm/sec)105-103 Particle size distribution Clay size fraction (%) Silt size fraction (%) Sand size fraction (%) Gravel size fraction (%) 1-10 8-85 7-90 0-10 Coefficient of uniformity3.1-10.7
The major constituents of most of the fly ashes are Silica (SiO2), alumina ((Al2O3), ferric oxide (Fe2O3) and calcium oxide (CaO). The other minor constituent of the fly ash are MgO, Na2O, K2O, SO3, MnO, TiO2 and unburnt carbon. There is wide range of variation in the principal constituents – Silica (25-60%), Alumina (10-30%) and ferric oxide (5-25%). When the sum of these three principal constituents is 70% or more and reactive calcium oxide is less than 10% -technically the fly ash is considered as Siliceous fly ash and also called as Class F fly ash. Such type of fly ash is produced by burning of anthracite or bituminous coal. Siliceous fly ash characteristically contains a large part of silicate glass of high silica content and crystalline phases of low reactivity mullite, magnetite and quartz. The active constituents of this type of fly ash is siliceous or alumino-silicate glass. If the sum of these three constituents is equal or less than 70% and reactive calcium oxide is not less than 10%, fly ash will be considered as Calcareous fly ash and also called as Class C fly ash. This type of fly ash is commonly produced by burning of lignite or sub-bituminous coal and possesses self setting property similar to cement.
Table 2: Chemical composition
ComponentBituminous Sub bituminous Lignite
SiO2 (%)20-6040-6015-45 Al2O3 (%)5-3520-3020-25 Fe2O3 (%)10-404-104-15 CaO (%) 1-125-3015-40 LOI (%) 0-150-30-5
1.7Quality of Fly Ash as per BIS, ASTM
To utilize fly ash as a Pozzolana in cement concrete and cement mortar, Bureau of Indian Standards (BIS) has formulated IS: 3812 Part-1 2003. In this code quality requirement for siliceous fly ash and calcareous fly ash with respect its chemical and physical composition has been specified. These requirements are given as below.
Table 3: Chemical Requirements of fly ash as a Pozzolana in cement concrete and cement mortar as per Bureau of Indian Standards (BIS)
S. No.CharacteristicsRequirements Siliceous fly ashCalcareous fly ash 1Silicon dioxide (SiO2) + Aluminium oxide (Al2O3) + Iron oxide (Fe2O3), in percent my mass, minimum7050 2Silicon dioxide in percent my mass, minimum3525 3Reactive silica in percent my mass, minimum (Optional test)2020 4Magnesium Oxide (MgO), in percent my mass, max.5.05.0 5Total sulphur as sulphur trioxide (SO3), in percent my mass, max.3.03.0 6Available alkalis as sodium oxide (Na2O), in percent my mass, max.1.51.5 7Total chlorides in percent my mass, max0.050.05 8Loss on Ignition, in percent my mass, max.5.05.0
Table 4: Physical Requirements of fly ash as a Pozzolana in cement concrete and cement mortar as per Bureau of Indian Standards (BIS)
S. No.CharacteristicsRequirements Siliceous fly ash and Calcareous fly ash 1Fineness – Specific surface in m2/kg by Blaine’s permeability method, Min.320
2Particles retained on 45 micron IS sieve (wet sieving) in percent, Max. (Optional Test)34 3Lime reactivity – Average compressive strength in N/mm2, Min4.5
4Compressive strength at 28 days in N/mm2, Min.Not less than 80 percent of the strength of corresponding plain cement mortar cubes 5Soundness by autoclave test – Expansion of specimen in percent, Max.0.8
ASTM International for fly ash: ASTM International C-618-03 specifies the chemical composition and physical requirements for fly ash to be used as mineral admixture in concrete. The standards requirements are given as below.
Table 5: Chemical Requirements of fly ash as a Pozzolana in cement concrete and cement mortar as per ASTM International
S. No.CharacteristicsRequirements Class F (Siliceous fly ash)Class C (Calcareous fly ash) 1Silicon dioxide (SiO2) + Aluminium oxide (Al2O3) + Iron oxide (Fe2O3), in percent my mass, minimum7050 2Sulfur trioxide (SO3), max. Percent5.05.0 3Moisture content, max., percent3.03.0 4Loss on ignition, max., percent6.06.0
Table 6: Physical Requirements of fly ash as a Pozzolana in cement concrete and cement mortar as per ASTM International
S. No.CharacteristicsRequirements for class F & class C fly ash 1Fineness – amount retained when wet-sieved on 45 micron (No. 325) sieve, Max., percent.34
2Strength activity index oWith portland cement, at 7 days, min., percent of control oWith portland cement, at 28 days, min., percent of control75c
75c 3Water requirement, max., percent of control105
4Soundness Autoclave expansion or contraction, max., percent0.8 5Uniformity requirements: The density and fineness of individual samples shall not vary from the average established by ten preceding tests, or by all preceding tests if the number is less than ten, by more than Density (max.) variation from average percent. Percent retained on 45 micron (no. 325), max variation, percentage points from average
2Main avenues for use of fly ash
2.1Cement concrete and mortar 2.2Fill Material – Road and embankments construction 2.3Reclaim wasteland 2.4Mine filling 2.5Bricks, blocks and tiles Manufacturing 2.6Agricultural soil 2.7Ash Dykes 2.8Autoclaved Aerated Concrete (AAC) 2.9Lightweight aggregates 2.10Cenosphere
2.1Using fly ash in cement concrete and mortar
Portland Pozzolana Cement fly ash based is manufactured either by intimately intergrinding Portland cement clinker and fly ash with addition of gypsum or calcium sulphate or by intimately and uniformly blending with OPC and fine fly ash. The pozzolanic property of fly ash makes it suitable as raw material for manufacture of PPC. IS:1489 Part-1-1991(Reaffirmed 2005) is BIS specification for this cement. As per the BIS specification, fly ash constituent shall not be less than 15 percent and not more than 35 percent by mass of Portland Pozzolana Cement.
Portland Pozzolana cement produces less heat of hydration and offer greater resistance to the attack of aggressive waters than Ordinary Portland Cement. It is particularly useful in marine and hydraulic construction and other mass construction structures. This cement is equivalent to Ordinary Portland cement on the basis of the 28 days and above compressive strength. Use of fly ash in cement manufacturing helps to conserve raw material such lime stone, clay etc and also conserve coal required for clinkerization for manufacture of cement clinker. During this process generation of CO2 is also reduced, therefore, eco-friendly.
It may be noted that, Bureau of Indian Standard also permits use of Fly ash up to 5% as a Performance Improver in the manufacturing of 33 grade, 43grade and 53grade of Ordinary Portland Cement.
2.1.1How fly ash woks with cement?
Fly ash being a pozzolanic material is found to be useful for part replacement of Ordinary Cement in cement concrete and Mortar. In the concrete, cement chemically reacts with water and produces strength bearing gels called as C-H-S gels that binds other component together and provide strength to concrete and creates strength bearing materials. The reaction process is called ‘hydration’ of cement. In this process some amount of lime [Ca (OH)2] is also liberated. Fly ash available in concrete reacts with this lime and forms additional similar strength bearing gel which provides strength to concrete. As we know Ordinary Portland Cement (OPC) is a product of four principal mineralogical phases. These phases are Tricalcium Silicate – C3S(3CaO.SiO2), Dicalcium Silicate – C2S(2CaO.SiO2), Tricalcium Aluminate – C3A(3CaO.Al2O3) and Tetracalcium alumino-ferrite – C4AF(4CaO.Al2O3Fe2O3). The setting and hardening of the OPC takes place as a result of reaction between these principal compound and water [H2O(H)] as shown under:
2C3S + 6H = C3S2H3 + 3CH (tricalcium silicate) water (C-S-H gel)(Calcium hydroxide) 2C2S +4H = C3S2H3 + CH (dicalcium silicate) (water) (C-S-H gel)(Calcium hydroxide)
The hydration products from C3S and C2S are similar but quantity of calcium hydroxide (lime) released is higher in C3S as compared to C2S. The reaction of C3A with water takes place in presence of sulphate ions supplied by dissolution of gypsum present in OPC. This reaction is very fast and shown under:
C3A + 3(CSH2) + 26H =C3A(CS)3H22 (tricalcium Aluminate (gypsum) (water) (ettringite)
C3A + CSH2 + 10H =C3ACSH2
(monosulphoaluminate hydrate) (S – SiO2, C – CaO, A – Al2O3, F – Fe2O3)
Tetracalcium alumino-ferrite forms hydration product similar to those of similar of C3A, with iron substituting partially for alumina in the crystal structures of ettringite and mono sulpho-aluminate hydrate.
Above reaction indicate that during the hydration process of cement, lime is released out and remains as surplus in the hydrated cement. This leached out surplus lime renders deleterious effects to concrete such as make the concrete porous, give chance to the development of micro-cracks, weakening the bond with aggregates and thus affects the durability of concrete.
If fly ash is available in the mix, this surplus lime becomes the source for pozzolanic reaction with fly ash and forms additional C-S-H gel having similar binding properties in the concrete as those product by hydration of cement paste. The reaction of fly ash with surplus lime continues as long as lime is present in the pores of liquid cement. The process is illustrated as below.
2.1.2Advantage of use of Fly ash with concrete
Fly ash concrete3 was as early as used in the U.S. for the Hoover Dam, where engineers found that it allowed for less total cement. It is now used across the world. Consisting mostly of silica, alumina and iron, fly ash is a pozzolana substance containing aluminous and silicious material that forms cement in the presence of water. When mixed with lime and water it forms a compound similar to portland cement. The spherical shape of the particles reduces internal friction thereby increasing the concrete’s consistency and workability, permitting longer pumping distances. Improved workability means less water is needed, resulting in less segregation of the mixture.
(i)Reduced Heat of Hydration
In concrete mix, when water and cement come in contact, a chemical reaction initiates that produces binding material and consolidates the concrete mass. The process is exothermic and heat is released which increases the temperature of the mass. The large temperature rise of concrete mass exerts temperature stresses and can lead to formation of micro cracks. When fly ash is used as part of cementitious material, quantum of heat liberated is low and staggers through pozzolanic reactions and thus reduces micro-cracking and improves soundness of concrete mass. (ii)Improved Workability of Concrete Fly ash particles are generally spherical in shape; this gives a ball bearing effect to the mixing of aggregates & cement. This way part mixing is achieved and leads for reduced water requirements for a given slump. The spherical shape helps to reduce friction between aggregates and between concrete and pump line and thus increases workability and improve pumpability of concrete. Fly ash use in concrete increases volume of fines and decreases water content and thus reduces bleeding of concrete. (iii)Reduced Permeability & increased corrosion protection Water is essential constituent of concrete preparation. When concrete is hardened, part of the entrapped water in the concrete mass is consumed by cement mineralogy for hydration. Some part of entrapped water evaporates, thus leaving porous channel to the extent of volume occupied by the water. Some part of this porous volume is filled by the hydrated products of the cement paste. The remaining part of the voids consists capillary voids and give way for ingress of water. Similarly, the liberated lime by hydration of cement is water-soluble and is leached out from hardened concrete mass, leaving capillary voids for the ingress of water. Higher the water cement ratio, higher will be the porosity and thus higher will be the permeability. The permeability makes the ingress of moisture and air easy and is the cause for corrosion of reinforcement. Higher permeability facilitate ingress of chloride ions into concrete and is the main cause for initiation of chloride induced corrosion. Additional cementitious material results from reaction between liberated surplus lime and fly ash, blocks these capillary voids and also reduces the risk of leaching of surplus free lime and thereby reduces permeability of concrete. (iv)Improved Resistance for Carbonation Phenomena Carbonation phenomenon in concrete occurs when lime of the hydrated Portland Cement react with carbondioxide from atmospheres in the presence of moisture and form calcium carbonate. To a small extent, calcium carbonate is also formed when calcium silicate and aluminates of the hydrated Portland cement react with carbon dioxide from atmosphere. Carbonation process in concrete results in two deleterious effects (i) shrinkage (ii) Corrosion. Concrete immediately adjacent to steel reinforcement may reduce its resistance to corrosion. The rate of carbonation depends on permeability of concrete, quantity of surplus lime and environmental conditions such as moisture and temperature. When fly ash is available in concrete; it consumes surplus lime by way of pozzolanic reaction, reduces permeability and as a result improves resistance of concrete against carbonation phenomenon.
(v)Increased Sulphate Resistance
Sulphate attacks in concrete occur due to reaction between sulphate from external origins or from atmosphere with surplus lime leads to formation of etrringite, which causes expansion and results in volume destabilization of the concrete. Increase in sulphate resistance of fly ash concrete is due to continuous reaction between fly ash and leached out lime, which continue to form additional C-S-H gel. This C-S-H gel fills in capillary pores in the cement paste, reducing permeability and ingress of sulphate ions.
(vi)Reduced alkali- aggregate reaction Certain types of aggregates react with available alkalis and cause expansion and damage to concrete. These aggregates are termed as reactive aggregates. It has been established that use of adequate quantity of fly ash in concrete reduces the amount of alkali aggregate reaction and reduces/ eliminates harmful expansion of concrete. The reaction between the siliceous glass in fly ash and the alkali hydroxide of Portland cement paste consumes alkalis thereby reduces their availability for expansive reaction with reactive silica aggregates. (vii)Greater long – term strength
The pozzolanic reaction between fly ash and lime liberated from hydration cement continue for longer period & generates additional cementitious gel which provide greater strength to concrete mass.
In a nutshell, it can be summarized that permeability and surplus lime liberated during the hydration of Portland cement are the root causes for deleterious effect on the concrete. Impermeability is the foremost defensive mechanism for making concrete more durable and is best achieved by using fly ash as above. Use of fly ash in concrete saves the cement requirement for the same strength thus saving of raw materials such as limestone, coal etc required for manufacture of cement and thus activity is eco-friendly.
The Indian Standards IS: 456-2000-entitled Plain and Reinforced cement concrete code of practice permits use of fly ash (conforming to IS:3812 Part-1) up to 35% as part replacement of OPC in the concrete. 2.2Use of Fly ash as a fill material i.e. for road embankment construction and similar projects One of the most significant characteristics of fly ash in its use as a fill material is its strength. Well-compacted fly ash has strength comparable to or greater than soils normally used in earth fill operations. In addition, fly ash possesses self-hardening properties which can result in the development of shear strengths. Significant increases in shear strength can be realized in relatively short periods of time and it can be very useful in the design of embankments6.
Construction of road embankments using fly ash, involves encapsulation of fly ash in earthen core or with RCC facing panels. Since there is no seepage of rain water into the fly ash core, leaching of heavy metals is also prevented. When fly ash is used in concrete, it chemically reacts with cement and reduces any leaching effect. Even when it is used in stabilization work, a similar chemical reaction takes place which binds fly ash particles. Moisture content of pond ash to be nearer to OMC after having been taken out from pond and stored for one or two days.
Use of fly ash in the construction of road embankment of the second Nizamuddin Bridge in New Delhi, has amply demonstrated its suitability as a material for road/embankment construction. The site proximity to the river Yamuna posed a challenge to use the conventional material; moreover, the embankment of 7 to 8 metre height was to be constructed for a stretch of about two kilometers in a flood zone.
The construction work has been completed in a record time. The on-site quality control was maintained with simple tests and procedures. These were similar to the corresponding requirements in case of earthworks. No operational or execution problems have been faced on technical aspects, rather the working with fly ash has been found to be easier and better. Further, use of fly ash results in an enormous amount of cost saving.
Advantages of using fly ash for road construction
a)Fly ash is a lightweight material, as compared to commonly used fill material (local soils), therefore, causes lesser settlements. b)Easy to handle and compact because the material is light and there are no large lumps to be broken down. Can be compacted using either vibratory or static rollers. c)High permeability ensures free and efficient drainage. After rainfall, water gets drained out freely ensuring better workability than soil. d)Work on fly ash fills/ embankments can be restarted within a few hours after rainfall, while in case of soil it requires much longer period. e)Conserves good earth, which is precious topsoil, thereby protecting the environment. f)Higher value of California Bearing Ratio as compared to soil provides for a more efficient design of road pavement. g)Pozzolanic hardening property imparts additional strength to the road pavements/ embankments and decreases the post construction horizontal pressure on retaining walls. h)Amenable to stabilization with lime and cement. i)Can replace a part of cement and sand in concrete pavements thus making them more economical than roads constructed using conventional materials.
2.3Use of Ash in waste land Reclamation
It is a very difficult task to convert a wasteland to greenery. Tata Energy and Resources Institute (TERI) had identified certain strains of naturally occurring mycorrhizal fungi that provide nutritional support and high level of stress tolerance to the plants. These were applied to plants on fly ash dumps in Korba Super Thermal Power Station with additional doses of organic and Mycorrhizal fertilizers. The fungi form a reciprocating relationship with the living roots by providing nutrition to plants from the substrate and receive carbon in turn from them. The mycelial network of the Mycorrhizal fungi, accumulate heavy metal from fly ash and retain them in their living cells. In a short period of time, the grey, toxic fly ash laden waste land was converted to that of green vegetation. The technology was successfully replicated in Badarpur and Vijayawada Thermal Power Stations
Waste5/degraded land/low lying areas near in the vicinity of different TPPs viz. Farakka STPP, Bhusawal TPS, Chandrapur STPP, Harduaganj/ Obra/ Anpara TPPs of UPRVUNL, NLC and in the State of Jharkhand have been reclaimed and made suitable for crop farming /social forestry /medicinal plants through bulk use of fly ash. Thus Fly Ash has been established to act as excellent soil conditioner/ modifier.
2.4Use of fly ash in Mine filling
Fly ash in back filling of opencast mines and stowing of underground mines can be used. In open cast mines after extraction of coal and completion of mining operation, mines are back-filled with over burden materials and remaining area can be backfilled with ash.
In case of under ground mines the conventional material for back filling is river sand. NTPC has got studies conducted (including fields trials) through Central Mining Research Institute, Dhanbad for use of bottom ash from Ramagundam for stowing operation in the under ground mines of Singreni. The study indicates that it is technically feasible to utilize bottom ash in stowing operations. More than 1,00,000 tonnes of bottom ash have already been stowed in these underground mines.
2.5Use of Fly Ash in Bricks and other building product Manufacturing
Fly ash can be used for making a variety of building materials such as Bricks, Blocks, Cellular concrete, Tiles etc. Brick is a basic need for the development works. Several studies show that fly ash brick is a far superior building material than burnt clay brick. The use of fly ash brick provides a stronger, more durable construction that is better protected from efflorescence and salinity with meaningful savings in construction costs. Fly Ash Brick Making Machines used for manufacturing bricks of different sizes from fly ash.
The process of manufacturing lime fly ash bricks is based on the reaction of lime with silica of fly ash to form calcium silicate hydrates(C-S-H) which binds the ingredients to form a brick. The quality of bricks8 obtained is highly dependant on the quality of fly ash. The manufacturing of Lime-Fly ash bricks are generally designed such that they stand at par with burnt clay bricks used conventionally. Fly ash bricks have good compressive strength, low water absorption, high density and low shrinkage value as compared to burnt clay bricks. 3.5.1Fly ash bricks can be divided into the following types
Clay Fly ash Bricks: Manufacturing process of clay fly ash bricks by manual or extrusion process involves mixing of fly ash (20 % – 80 %) with clay of moderate plasticity. The green bricks are dried under ambient atmospheric conditions or in shed to equilibrium moisture level of below 3 %. Dried bricks are fired in traditional brick kilns at 1000 30 C with a soaking period of 5 – 7 hours at maturing temperature. Fly ash Sand Lime Bricks: In presence of moisture, fly ash reacts with lime at ordinary temperature and forms a compound possessing cementitious properties. After reactions between lime and fly ash, calcium silicate hydrates are produced which are responsible for the high strength of the compound. This process involves homogeneous mixing of raw materials (generally fly ash, sand and lime), moulding of bricks and then curing of the green bricks. 3.5.2Advanced work: Cold Bonded Lightweight Fly ash Bricks, Blocks and Tiles: The material can be produced in a variety of building blocks, bricks and tiles, depending on local markets and regulations. The mixed raw material is cast in moulds, after which the moulds are processed in a microwave oven for transportation to the building site. Flux Bonded Fly ash Bricks Blocks and Tiles: The process is similar to the one in the conventional tile industry: fly ash is mixed with less than 10 % plastic clay and a few additives and tiles, bricks or blocks are pressed. These shapes are fired in the range of 900C to 1000C to make the final product. More than 85% of fly ash is used in the process. 3.5.2Advantages of fly ash bricks over clay bricks:
1)Growing cold crushing strength 2)No efflorescence 3)Compact construction & Consistent quality 4)Better thermal insulation properties 5)Availability through out the year. 6)Better shape & finish 7)Rationalization of Mortar with optional need of Plaster.
Fly ash Bricks v/s Normal Clay Bricks – Comparison
NORMAL CLAY BRICKFLY ASH BRICK Varying colour as per soil Uniform pleasing colour like cement Uneven shape as hand made Uniform in shape and smooth in finish Lightly bonded Dense composition Plastering required No plastering required Heavier in weight Lighter in weight Compressive strength is around 35 kg/cm2Compressive strength is around 100 kg/cm2 More porous Less porous Thermal conductivity 1.25 – 1.35 w/m2 C Thermal conductivity 0.90-1.05 w/m2 C Water absorption 20-25%Water absorption 6-12%
Subhash Chandra Sr Engineer AUD NTPC Limited Noida Office
Normal Clay Brick Fly Ash Brick
Day by day the uses of concrete blocks are gaining importance due to its own importance and advantages, except for its cost. The cost of concrete blocks can be cut drastically with the use of fly ash for its manufacturing. Manufacturing of fly ash blocks requires following ingredients Fly Ash: The fly ash should conform to IS requirement; dry fly ash with lime reactivity more than 60 kg/cm2. Cement: 43 grade Ordinary Portland Cement conforming to IS Sand: sand required for the mix should be free from dirt, impurities and fall in zone II. Coarse Aggregate: Crushed aggregate of maximum nominal size 10 mm.
Manufacturing: The fly ash concrete blocks can be manufactured on machine. Blocks are partially compacted and it requires to attend early strength so that transportation is easy. The fly ash is mix dry with the cement, before adding the raw materials to the mixer. The properly mixed concrete is placed in the block making machine. The blocks extracted from the machine is air dried and then sent for curing. Fly ash concrete requires more period for curing than ordinary concrete.
2.6Use of Ash in Agriculture Fly Ash consists of practically all the elements present in soil except organic carbon and nitrogen. Thus it was found that this material could be used as an additive material in agriculture applications. In view of the above, some agencies/ individuals/ institutes at dispersed locations conducted some preliminary studies on the effect and feasibility of fly ash as an input material in agricultural7 applications. It was generally observed that both sandy and clayey soils tend to become loamy in texture. Optimum bulk density in turn improves the soil porosity, the workability of the soil, the root penetration and the moisture retention capacity of the soil. The application of Fly Ash has been found to increase the available water content of loamy sand soil by 120% and of a sandy soil by 67%. RRL Bhopal reported that application of Fly Ash increase the porosity of Black Cotton Soil and decreases the porosity of sandy soils and thereby saves irrigation water around by 26% and 30% respectively. This improvement in water holding capacity is beneficial to the plants especially under rainfed agriculture. Further, in India most of the Fly Ash produced is alkaline in nature. Hence an application of these to agricultural soil increases the soil PH; it simultaneously adds essential plant nutrients to the soil. Some fly ash is acidic which may be used for reclamation of alkaline soils. Fly ash application helps in reducing surface encrustation, which is a problem in red soils. Studies in this context have revealed the followings. It improves permeability status of soil Improves fertility status of soil (soil health) / crop yield Improves soil texture Reduces bulk density of soil Improves water holding capacity / porosity Optimizes ph value Improves soil aeration Reduces crust formation Provides micro nutrients like Fe, Zn, Cu, Mo, B, Mn, etc. Provides macro nutrients like K, P, Ca, Mg, S etc.
Keeping the above important findings in view, pond ash at a dose of 30-50 tonne per hectare on one time basis along with recommended dose of fertilizers / manures is recommended for its use agriculture/ forestry sector/wasteland management or cultivation of different cereals / pluses/ oil seeds / vegetables etc., the repeat application of which can be made after 4-5 years as it would have significant residual effect on the yield of succeeding crops over a period of 4-5 years. 2.7Ash Dyke Raising
A number of ash disposal facilities across the country have been designed. Ash dyke9 maintaining is one of them. It can be raised both by dry disposal and wet disposal system. In dry disposal, the fly ash is transported by truck, chute or conveyor at the site and disposed of by constructing a dry embankment (dyke). An important aspect of design of ash dykes is the internal drainage system. The seepage discharge from internal surfaces must be controlled with filters that permit water to escape freely and also to hold particles in place and the piezometric surface on the downstream of the dyke. The internal drainage system consists of construction of rock toe, 0.5m thick sand blanket and sand chimney. After completion of the final section including earth cover the turfing is developed from sod on the downstream slope. 2.8Autoclaved Aerated Concrete Autoclaved Aerated Concrete (AAC) is a precast structural product made with all-natural raw materials. In 1914, the Swedes discovered a mixture of cement, lime, water and sand that expands by adding aluminum powder. The material was further developed to what we know today as autoclaved aerated concrete (also called autoclaved cellular concrete). It is an economical, sustainable, solid block that provides thermal and acoustic insulation as well as fire and termite resistance. AAC is available in a variety of forms, ranging from wall and roof panels to blocks and lintels. To manufacture AAC, Portland cement is mixed with lime, silica sand, fly ash, water and aluminum powder or paste and poured into a mold. The reaction between aluminum and concrete causes microscopic hydrogen bubbles to form, expanding the concrete to about five times its original volume. After evaporation of the hydrogen, the now highly closed-cell, aerated concrete is cut to size and formed by steam-curing in a pressurized chamber (an autoclave). The result is a non-organic, non-toxic, airtight material that can be used for wall, floor, and roof panels, blocks, and lintels which according to the manufacturers, generate no pollutants or hazardous waste during the manufacturing process AAC may be beneficial in climates where outdoor temperature fluctuates over a 24-hour period from above to below the indoor temperature conditioned air set point. Advantages of AAC: 1.Light weight construction hence lighter foundation 2.Faster construction 3.Higher thermal and sound insulation 4.Higher resistively to fire 5.Lesser size of structural member i.e. lesser section of beams and columns 2.9Manufacturing lightweight aggregates from fly ash These are in great demand where stone mining is banned. However it is not true replacement of stone aggregate but good alternative where local requirement are of lower range. Lightweight aggregates have been manufactured by sintering fly ash and crushing the product into suitable sizes. These aggregates possess unique characteristics that make them suitable for high strength and high performance concrete. Concrete produced using these aggregates is around 22% lighter and at the same time 20% stronger than normal weight aggregate concrete. Drying shrinkage is around 33% less than that of normal weight concrete. Moreover, the aggregates possess high durability characteristics required in high performance structures. The importance of the new aggregates lies mostly in the fact that superior qualities are achieved without having to increase the cement content. Thus it is possible to reduce the amount of cement by as much as 20% without affecting the required strength. The use of lightweight aggregate in concrete has many advantages. These include: (a) Reduction of dead load that may result in reduced footings sizes and lighter and smaller upper structure. This may result in reduction in cement quantity and possible reduction in reinforcement. (b) Lighter and smaller pre-cast elements needing smaller and less expensive handling and transporting equipment. (c) Reductions in the sizes of columns and slab and beam dimensions that result in larger space availability. (d) High thermal insulation. (e) Enhanced fire resistance. 2.10Cenosphere – Fly Ash by-product The process of burning coal in thermal power plants produces fly ash containing ceramic particles made largely of alumina and silica. The ceramic particles in fly ash have three types of structures. The first type of particles are solid and are called precipitator. The second type of particles are hollow and are called cenospheres. The third type of particles are called plerospheres, which are hollow particles of large diameter filled with smaller size precipitator and cenospheres. Thus Cenosphere is a by-product of fly ash. A cenosphere is a lightweight, inert, hollow sphere filled with inert air or gas. The color of cenospheres varies from gray to almost white and their density is about 0.4-0.8 g/cm, which gives them a great buoyancy. These are hard and rigid, light, waterproof, innoxious, and insulative. This makes them highly useful in a variety of products, notably fillers. 3Legal Issues – Ash Utilization United Nations Conference on the Human Environment held at Stockholm in June, 1972, in which India participated, to take appropriate steps for the protection and improvement of human environment. In view of this, parliament passed THE ENVIRONMENT (PROTECTION) ACT, 1986 on 23rd May, 1986 for protection and improvement of environment and the prevention of hazards to human beings, other living creatures, plants and property. Consequently Ministry of Environment and Forest, Govt of India has issued Gazette Notification regarding use of Fly Ash, which is as under:
1st Notification – 14.09.1999
Use of fly ash, bottom ash or pond ash in the manufacture of bricks and other construction activities.- (1) No person shall within a radius of fifty kilometers from coal or lignite based thermal power plants, manufacture clay bricks or tiles or blocks for use in construction activities without mixing at least 25 per cent of ash (fly ash, bottom ash or pond ash) with soil on weight to weight basis. ‘ (2) There shall be a authority for ensuring the use of specified quantity. In case of non-compliance, the said authority may cancel the license of brick kiln or may cancel mining lease (3) In case of non-availability of ash from thermal power plant in sufficient quantities as certified by the said power plant, the stipulation under para (1) shall be suitably modified (waived/ relaxed). (4) Each coal or lignite based thermal power plant shall constitute a dispute settlement committee. (5) Annual implementation report providing information about the compliance of provisions in this notification shall be submitted by the 30th day of April every year to the Central Pollution Control Board, concerned State Pollution Control Board/Committee and the concerned Regional Office of the Ministry of Environment and Forests by the coal or lignite based thermal power plants. (6) Power Plants to issue ash free of cost for ten years. (7) Use of fly ash, 100% utilization of Ash by all thermal power stations in – 15 years for existing stations – 9 years for new stations Specifications for use of ash-based products.- (1) Manufacture of ash-based products such as cement, concrete blocks, bricks, panels or any other material or the use of ash in construction activity such as in road laying, embankments or use as landfill to reclaim low lying areas including back filling in abandoned mines or pitheads or for any other use shall be carried out in accordance with specifications and guidelines laid down by the Bureau of Indian Standards, Indian Bureau of Mines, Indian Road Congress, Central Building Research institute, Roorkee, Central Road Research Institute, New Delhi, Building Materials and Technology Promotion Council, New Delhi, Central Public Works Department, State Public Works Departments and other Central and State Government agencies. (2) The Central Public Works Department, Public Works Departments in the State/Union Territory Governments, Development Authorities, Housing Boards, National Highway Authority of India and other construction agencies including those in the private sector shall also prescribe the use of ash and ash-based products in their respective schedules of specifications and construction applications, including appropriate standards and codes of practice, within a period of four months from the publication of this notification. (3) All local authorities shall specify in their respective building bye-laws and regulations the use of ash and ash-based products and construction techniques in building materials, roads, embankments or for any other use within a period of four months from the date of publication of this notification.
2nd Notification – 27.08.2003 (Amendment)
1.Radius for Use of ash for Brick manufacturing increased from 50 km to 100 km 2.Buildings within a radius of 50 Km to use ash based Bricks / Blocks /Tiles in phased manner i.e. 50% by 31st August 2004 100% by 31st August 2005 3.Buildings within a radius of 50 to 100 Km 25% by 31st August 2004 50% by 31st August 2005 75% by 31st August 2006 100% by 31st August 2007 4.It is responsibility of the construction agency either undertaking the construction or approving the design or both to ensure the implementation of the above provision 5.In case of non-compliance, consent order & mining lease of brick kilns to be cancelled. 6.Power plants to maintain month-wise record of ash made available to each brick kiln. 7.Implementing authority shall be Regional Officer of the State PCB or the Pollution Control Committee.
3rdNotification – 03.09.2009 (Amendment)
1.Mandate of compulsory use of fly ash in clay bricks/ tile/ block within 100 km of TPS-deleted 2.Free issue of fly ash and pond ash to Cement, Ready Mixed Concrete, Asbestos Products etc.-deleted 3.Existing TPS / expansion units in operation to achieve ash utilization levels (from date of Notification), as mentioned below: At least 50%- 1 year, 60% -2 years, 75% – 3 years,90% -4 years, 100%-5 years 4.New TPS / expansion units commissioned after this notification At least 50% – 1 year, 70% – 2 years, 90%-3 years, 100%- 4 years
5.TPS would be free to sell fly ash to User Agencies subject to: Pond ash -to be given free on -as is where is basis- to manufacturers of Bricks/ Blocks and tiles, Farmers, Central / State Road Construction Agencies, PWD and to agencies engaged in Mine filling. At least 20% of dry ESP fly ash -free of charge to units manufacturing fly ash/ clay-fly ash bricks, blocks & tiles on a priority basis over other users. No fly ash to be made available to defaulting users. 6.The amount from sale (including by subsidiary / sister concern) to be kept in separate account head and to be utilized only for development of infrastructure / facilities and promotion / facilitation activities for use of fly ash, until 100% ash utilization is achieved. 7.The amount can be utilized for other development programs as long as 100% ash utilization level is maintained. 8.TPS to constitute dispute settlement committee which shall include GM of plant, representatives of relevant construction and fly ash brick manufacturing association. 9.Fly ash means all type of ash such as ESP ash, dry fly ash, bottom ash, pond ash and mound ash. 10.Mandatory to use at least 25% of fly ash within a distance of 50km (by road) under the guidance of DGMS
4Major Successful examples World Over The ash generated from Volcanoes was used extensively in the construction of ancient Roman structures i.e. The Aqueduct of Segovia, Spain, Dome of the Pantheon, Insula in Ostia Antica, The Baths of Caracalla, etc. Colosseum (in the year 100 A.D.) is a classic example of durability achieved by using volcanic ash. Volcanic Ash acts just like our Fly Ash. In the United States of America more than six million tonnes and in Europe more than nine million tonnes are used annually in cement and concrete. So it is hard to think about concrete construction without considering the use of fly ash. Some of the most prestigious projects of recent times have relied on fly ash concrete, including dams, power stations, offshore platforms, the Channel tunnel, highways, airports, commercial and residential buildings, bridges, pipelines and silos. No wonder that fly ash is used in all sectors of the concrete industry, covering ready-mixed, precast and on-site applications. Fine examples of application of minerals from coal can be seen throughout world: Water Tower Place in Chicago, the Eisenhower Expressway in Chicago, Picasso Tower in Madrid, the Commerzbank Tower in Frankfurt, Puylaurent dam in France, the Channel Fig. 5: Burj Dubai Tunnel between France and United Kingdom, the Underground railway tunnel in Vienna, in the East Bridge in Copenhagen, and the Eindhoven Airport landing strip in the Netherlands. High performance concrete is used in the construction of the world’s tallest building (Burj Dubai) in Dubai, United Arab Emirates: 990 fine aggregate, 810 coarse aggregate, 350 Portland cement, 120 Class F fly ash (probably exported from India), 30 Microsilica, 135 water and superplasticizer (kg/m3). India Fly Ash has been used successfully in many prestigious projects in India. Some of them are: Okhla Fly over Bridge, New Delhi, Hanumaan setu, the fly over near Yamuna Bazar, Delhi, Sarita Vihar flyover in Delhi, Noida-Greater Noida Expressway, plant roads at Budge-Budge thermal power station, NH-6 four laning work near Kolkata, one km long rural road near Raichur in Karnataka etc. Use of Roller Compacted concrete technology using high doses of fly ash for construction of Saddle Dam and upper Dam of Ghatghar pumped storage Scheme near Nashik, have been implemented. 5.Conclusion:
Use of fly ash in various applications imparts several technical and environmental benefits and thus it is eco-friendly. Large quantity of fly ash is being produced every year in power generation process and huge area of agriculture land is being used for its storage / disposal. Since electricity is requirement of every individual, it is the responsibility of every user to make sincere efforts for its gainful utilization and protection of environment. References: – 1.IS 3812-2003, Pulverized Fuel Ash specification, part 1for use as pozzolana in cement, cement mortar and concrete. 2.ASTM international C: 618-03 Standard specification for coal ash and Raw or Calcined Natural Pozzolana for use in concrete. 3.V M Malhotra and A A Ramezaniapour March 1994, Fly Ash in Concrete. 4.Seminar document, May 1996 Maharshtra India Chapter of ACI, Use of fly ash in concrete. 5.Using fly ash Extracting value from waste Published by INEP. 6.Vimal Kumar and Mukesh Mathur Fly ash in roads and embankment, National seminar and Business Meet in Use of Fly Ash in Roads and Embankment, Allahabad, June 2005, pp.3-15. 7.Chand, S.K. and Rao, Bhuganga D.D. Fly ash disposal or utilization?, International Conference on Fly Ash and Utilization, 1998, Central Board of Irrigation and Power, pp. I-5, 35-40. 8.Bhanumathidas, N. and Kalidas, N. Fly ash for bricks, cement and concrete: The Indian perspective, Paper presented at the plenary session of the CANMET/ACI Conference on Fly ash, Silica fume, Slag and Natural Pozzolanas in Concrete, Chennai, July 2001. 9.Extract from paper ‘Technology: Fly ash Disposal and Utilization: The Indian Scenario’ by Rajiv Sinha, Department of Civil Engineering, IIT Kanpur Subhash Chandra Sr Engineer AUD NTPC Limited Noida Office CHAPTER ON FLY ASH FOR GRADUATE (CIVIL ENGINEERING) COURSE STUDENTS
Copyright 2009 Chip Cooper
Safire’s New Political Dictionary defines “hot-button” as follows: word or issue that ignites anger, fear, enthusiasm, or other passionate response.
Safire’s definition fits two Internet advertising issues – behavioral and keyword ads – perfectly. Two developments in the first few months of 2009 show how these hot-button issues are developing, and how they may ultimately impact Internet advertising in a fundamental way.
Relevance is a key concept in any advertising. With it, advertisers’ messages hit home with purchasers, and conversions increase. Without it, advertisers’ messages are wasted on blind eyes and deaf ears.
Behavioral ads take Internet advertising to a new level of relevancy. Behavioral technology tracks a user’s behavior on the Web, including sites visited, length of visits, content read, and searches made. All of this data is then analyzed and a behavioral pattern is produced for a user which classifies that user by his or her online demographic. Behavioral ad networks then serve targeted ads that are relevant to that online demographic.
Recent announcements by Google (with its AdSense network) and Facebook that they will begin serving behavioral ads has triggered increased interest in related privacy issues. The concerns: the lack of transparency regarding collection practices and the risk of disclosure of the information collected, particularly sensitive information.
The Federal Trade Commission (FTC) has shown interest in privacy issues related to behavioral ads even before the announcements by Google and Facebook. In November 2007, the FTC conducted a town hall discussion to discuss privacy issues raised by online behavioral advertising. Afterward, the FTC developed proposed principles based on comments received at the town hall discussions.
In February 2009, the FTC issued a staff report entitled “Self-Regulatory Principles For Online Behavioral Advertising” (Principles). The Principles are designed to encourage industry self regulation for the protection of consumer privacy in online advertising activities.
The new development for behavioral ads is that – if three U.S. Congressmen have their way – behavioral ads will move from self-regulation to regulation by a federal statute.
It’s interesting to note that the legislative effort is bi-partisan. Rep. Cliff Stearns (R.-Fla.), Rep. Rick Boucher (D.-Va.) and Rep. Joe Barton (R.-Texas) are working to present a bill to Congress that would regulate behavioral ads. Boucher has stated that websites participating in behavioral ads should be required to obtain explicit permission from a user, plus the requirement to disclose how they collect and use data.
In the last four years or so, cases involving keyword-triggered ads have been hotly litigated. The dispute is now a familiar one — whether a search engine such as Google should permit pay-per-click advertisers to use keywords that are also a competitor’s trademarks for purposes of triggering their ads on a search results page.
Legal issues arise when a competitor purchases a competitor’s trademark as a keyword. The Lanham Act (Federal Trademark Act) prohibits any:
* “use in commerce”, and
* “likelihood of confusion”.
In order to prevail, a plaintiff must satisfy two of the foregoing elements.
The legal battle has focused on the “use in commerce” issue, with courts being hopelessly divided on the issue. Courts finding that keyword-triggered ads are a “use in commerce” favor plaintiffs (the trademark owners). Conversely, courts finding that keyword-triggered ads are not a “use in commerce” favor the defendants (the advertisers – search engines and their advertiser customers).
Until April 3, 2009, the 2nd Circuit (Connecticut, New York, and Vermont) has held that use of a trademark in keyword-triggered ads, provided the trademark is internal and not visible, does not amount to “use in commerce” – thereby favoring defendant-advertisers.
On April 3, 2009, the 2nd Circuit reversed its position on the “use in commerce” issue. In the case of Rescuecom v. Google, the 2nd Circuit ruled on a Motion to Dismiss that Google’s recommendation and sale of Rescuecom’s trademark to competing advertisers amounted to a “use in commerce”. Although this decision went against Google, Google may still prevail in the case if the court finds later that there is no likelihood of confusion.
It’s interesting to note that the majority of Circuit Courts have previously held that similar uses of a trademark amount to a “use in commerce”. Does the reversal by the 2nd Circuit signal a trend that could significantly favor trademark owners against advertisers and close the split among the Circuits? Possibly — and that’s why this decision is so important.
With the foregoing update, this is where we stand on the two hot-button issues of Internet advertising:
* behavioral advertising — although the status remains unchanged at present, there is federal regulation in the works that could impose significant privacy regulations in the near future; and * keyword-triggered ads — there’s still a significant split among the Circuits; however, the split has narrowed in favor of trademark owners due to the 2nd Circuit’s ruling in the Rescuecom v. Google case. The 2nd Circuit in its decision suggested that it would make sense for Congress to resolve this split with specific legislation in the future.
This article is provided for educational and informative purposes only. This information does not constitute legal advice, and should not be construed as such.
Many people who are unfamiliar with general transcription ask where to find transcription training so they can start working at home as a general transcriptionist. Some people think you don’t need any training at all and it’s simply a matter of being able to type fast and listen well. And there are some people that are naturals; they learn quickly how to use the software and other tools and they start right in on picking up work within a few days.
And some others start in this business after learning and doing transcription on the job with a former employer. Since they have the skills already in place and have been doing transcription for a while, they simply need to adapt to being home-based and self employed.
But for many others, it’s not so simple and they really need to get back to the basics and learn additional skills before attempting to move into this business as a source of home-based employment or income because this isn’t just some “type from home and make money” scheme. This is a genuine business working with real people and real companies to earn real money.
And it’s up to you to use your best judgement and decide if paying for a transcription course is really necessary.
If you’re unfamiliar with what “general transcription” is, let me start by saying that in my opinion, there really is no way to “train” to do general transcription. There are no accredited or certified General Transcription courses and learning to use a transcription machine or software is often part of another course in business or a part of certified medical and legal transcription programs. But so far, you cannot become a Certified General Transcriptionist.
And why is that? Because general transcription fills in the gap; it is everything but medical and legal, so you can get transcription work from any industry and any individual. Unlike the medical and legal fields, there are no industry specific structured ways of typing information into specific templates.
You may do an academic transcript one day in one format on one subject, then do a podcast or general interview the next day in another format in a completely different subject. And since each client sets up their documents a different way depending on what they’re going to do with it, the same client may have several different formats they want you to use.
In fact, your clients may simply say, ‘Just set it up how you think is best,’ and you get to be creative. So you simply cannot learn to use only one or two different “one size fits all” templates. It’s much too varied.
So basically, if you decide you need hands-on training in a formal setting, you’re more than likely looking at having to take a medical transcription or legal transcription certificate program and then adapt what you’ve learned into the general transcription field. And that’s not really a bad thing because you can never have enough education.
Now if you already have a solid grasp of the English language, typing and you can learn software rather quickly, you may not need to take any professional courses to start in general transcription. But you may need to learn a little bit more about the business end of things, like what software you need and how to get clients. In this case, there are a few books and online resources you can buy.
You need to thoroughly check these resources out though to make sure you’re not wasting your money. So check for testimonials and even contact the authors. Make sure the course or book will provide a wide variety of sample document formats to use and how to set them up. This will help you learn your word processing program. But remember, these are just samples. You won’t know ahead of time what your specific clients may want, but if you get enough practice, you’ll be able to set up anything they require.
Good transcription training courses that are worth their money should also provide you with several sample digital audio files you can practice with, and where to find more samples online, such as business podcasts to download and practice with. It should also include a section that shows you how to record a webcast or podcast from the Internet using digital audio recording software, and a brief section on how to convert a physical cassette tape to a digital file.
And finally, it should show you how to use AutoCorrect and other keyboard shortcuts that will help you with your typing speed.
So, while taking a formal course in transcription training can be costly without getting a college grant, finding a decent course online or simply learning by doing does not have to be expensive. With a little research and effort, you should be finished and on your way to working from home in as little as a few months time.
And remember, having the freedom to work at home with a business that is growing in demand will provide you with the means to enjoy your family, avoid the stress of the average workplace, and give you a sense of pride that you can only achieve from being your own boss.
Everything comes to us by probably the most fundamental law of physics – LIKE ATTRACTS LIKE! This is known as the Law of Attraction.
The Law of Attraction, like all physical laws, operates with precise precision. It is impersonal, which means it really works whenever you want it to and when you don’t want it to.
It has nothing to do with your personality, your spiritual beliefs, being a ”good or a bad person or something else. No one lives outside this law. It is an irrefutable law as real as the Law of Gravity.
Before the Law of Gravity was discovered nobody believed it existed, and yet everyone was still affected by it. Such in the case with the Law of Attraction. Most people are unaware of the procedure of how it really works and yet everyone seems to be still affected by it.
You don’t need to understand the procedure of how the Law of Gravity works to keep yourself from floating off into space. You also don’t need to be familiar with the mechanics of how the Law of Attraction works for it to function in your life.
You may not have realized it until now, but everything you go through in your life is invited, attracted and created by you. There are no exceptions. That won’t be good news if your life is not going the way you want it to go. And because most of us are not too happy with what we have produced in our lives, we have become extremely gifted masters at attracting an overabundance of conditions that we would rather not have.
The mind attracts anything is familiar to itself. The frightened mind attracts frightening experiences. A confused brain attracts further confusion. The abundant brain attracts additional abundance.
Since we attract what we think about, it makes good sense to detect the subconscious thinking patterns that manipulate our lives.
If you want to take control of your life, it is important that you gain a basic understanding of who you are and where you are going .Start your journey of self discovery at once. Nothing but good can come out of it.
Allow yourself to take the next step right now. A step that goes Beyond the Law of Attraction.
Life is like taking a trip on the river and reacting to the FLOW.It is always about the FLOW. The problem is most people take their Boat down to the river, put it in the river and then they invariably turn it UPSTREAM and start paddling hard against the current. It never occurs to them to go downstream because they think they have to struggle to have what they want.
The 2009 Car Complaint Index has just been published, showing the ranking, by vehicle, of cars receiving the highest ratio of complaints to sales. Complaints are fielded by the National Highway Traffic Safety Administration (NHTSA), results are published yearly and this year shows the Land Rover LR2, the Mitsubishi Lancer, the Pontiac Solstice, the Dodge Avenger and Subaru Impreza to be the top offenders.
Attention is sharply paid to vehicles with high complaint ratios for good reason: the percentage of defective vehicles, or lemons, is astoundingly high, especially from the U.S. Big Three automakers. To add insult to injury, when a defect is found in a vehicle, a manufacturer will do as much as possible to cover it up so that they are not plagued with demands for refunds or replacements.
There is, in fact, something called a secret warranty that can act as a deflection to consumers with valid lemon law complaints. A secret warranty is a strategy that manufacturers use to avoid a recall, explained California lemon law attorney Norman Taylor. Under a secret warranty, manufacturers will pay for repair of a particular defect in a particular kind of vehicle, even after the warranty has expired. They call them warranty adjustment policies or goodwill gestures. And even these have to be pried from the manufacturers by loudly complaining consumersonly the squeaky wheel actually gets the grease.
Taylor has witnessed such practice many times over the years. He has been a lemon law specialist since 1987, and he and his firm, Norman Taylor and Associates, have handled over 6,000 cases for consumers with a 98 percent success rate. He is one of the leading lemon law attorneys in southern California.
It comes as no surprise that manufacturers will resort to such tactics to avoid a recall. If the NHTSA discovers safety-related defects and orders a recall, the manufacturer must arrange to repair the defect at no charge or, if the manufacturer chooses, can replace or repurchase the vehicle or defective component. The manufacturer must also file a public report with detailed information on the recall, must notify all owners of affected vehicles, and take numerous other costly steps to right the wrong.
Because manufacturers can and do take every measure to avoid replacement or refund of defective vehicles, it behooves any consumer who believes he or she may have purchased a lemon to contact a qualified lemon law attorney right away.
About Norman Taylor & Associates
Norman Taylor and Associates have been assisting consumers since 1987. At Norman Taylor & Associates, the goal is to provide clients with the highest quality of legal representation if theyre one of the unfortunate residents of California whove had the misfortune of purchasing defective vehicles or goods and who have recourse under the Lemon Law. They represent consumers in Los Angeles, Orange, Riverside, San Bernardino, Ventura and Santa Barbara counties. With a twenty two year history of successful cases, Norman Taylor & Associates has established their reputation as a firm of consumer advocates that get the job done.
What is Mental Photography?
Mental Photography is your brain’s natural ability to tap into your own photographic memory. It’s a capability that everyone possesses and enables us to take in books and other information at a phenomenal rate. This process even leaves speed readers in the dust. In fact this advanced learning technique allows a person to take in new information about 100 times faster than the average reading speed. Even people with Dyslexia, ADD or ADHD can quickly master learning new information at amazing speeds.
Not only does Mental Photography help your brain process information at a faster rate, but it also enables us to retain the memory for life. Most of the things we read are forgotten within the first 48 hours. This learning system uses different pathways in your brain to help you process facts quickly and easily. More importantly, your brain will not forget. Information goes straight in and stays in long-term memory. They say it’s as if you read a book 100 times.
The process also helps you to become a lateral thinker. This ability helps a persons brain to solve complex problems that would ordinarily boggle the mind. Your brain’s thinking capabilities will improve exponentially.
Using Mental Photography can fully enhance your use of the Law of Attraction. According to the people at Zox Training Systems, by using Mental Photography, “You are actually turbo charging the part of your brain that works with The Secret Law of Attraction…To put your powers of manifestation 100% into hyper-drive.” What an intriguing possibility that is, hyper-driven manifestation.
The only limitations any of us have are our own negative thoughts. Our brains are fully programmable. The problem is most of us have been programmed with limited, negative thinking. It is proven by years of research that a brain can be reprogrammed. It doesn’t matter how old you are. You can achieve anything if you only think you can. The human brain can be programmed to eliminate negative thought patterns. Without this negativity a person can begin to move toward his/her own unlimited being. The power of the Law of Attraction along with your own enhanced mental powers can be life changing.
Astronaut, Edgar Mitchell says this about the technique, “What better way to be of service to our fellow humans and to simultaneously create a better life for ourselves than to introduce everyone to the benefits of the Subliminal Dynamics/Brain Management process?”
Mental Photography can help to use that huge area of the brain that normally goes untapped. Imagine how that could alter your world.
Dreams may be big or small for all, but dreams are seen by all. Everyone loves to be in a dreamy world and some people are so very determined about their dreams that they turn no stones unturned to make it happen. Elaborating of business is an aspiration for all. All the business people want to have a bigger platform for their business to expand. US are one of the biggest nations over the world. Everyone tries to own a place there so that their lives can be better and bigger as well. The availability of the platform in US is not found that easily. The process of getting US platform is very tough and a person has to go through a lot of rules and regulations to achieve it.
What is EB5 Investment?
Let us jot down some of the points that will make you get to know how about who to make your base over US. The first step to enter over the US world is through EB5 Investment Visa. This is the visa that is used for the foreign nationals for acquiring of the green card and become a legal citizen of United States. The process of getting this visa is not at all easy. For making your business appear in a bigger platform you have to appear for the investment visa. This visa act is created by the Immigration Act of 1990 and is considered as the United States visa. For obtaining that visa it is a long process and the person has to go through a detailed process mode. If anyone wants to obtain the visa then the individuals must invest $1,000,000 or at least $500,000 in a “Targeted Employment Area”, creating and preserving of atleast 10jobs for the U.S worker by each of the migrated company.ny.
Going through such a process will help you to get the EB5 Investment that will help you to acquire a great life and a prosperous business over the world’s most influential state. The business gets a great increase very easily. When you have acquired this then it can be made for sure that you will get a citizenship of the country as well. EB5 Green Card holders are found very rare and they have to go through a tedious process to posses it. Getting green card means that you have the rights to access all types of benefits for its citizens in US. Being a legal citizen is a great achievement for all who have acquired it. it helps the betterment of your life easily.
Now let us focus a bit on what does franchise opportunity all means. It is about to increase your business in a much easier way. The more the outlets of a business, the more its popularity and also the profit benefits are also increased very easily through this opportunity. In short it would not be wrong to say that business gets expanded when the franchises are more.
If the world of law inspires you and the system of justice fascinates you, a career in law is for you. Legal profession is a fast growing, lucrative and the most respected career in India today. It is a very exciting and adventurous career. To pursue a career in law, one needs to pursue professional law courses. There are a number of institutes and universities in India that offer law courses. One could specialize into one of the various arms of law such as: corporation law, civil law, criminal law, and international law, labor law, patent law, tax law and so on.
In India, both government and private institutes offer under-graduate and post-graduate law courses to students. One could pursue LLB and LLM after graduation from these universities. Apart from the degree law courses, some institutes also offer diploma law courses in various disciplines such as Administrative Law, International Law, Labour Laws, Tax Laws and Corporate Laws. These small law courses are also helpful in building a successful career in law.
There are various branches of specialization in the field of law. These include civil law, criminal law, corporate law, property law, income tax law, marine law, public international law, family law, labour law, press law, excise law, constitutional law, administration law, sale of goods law, trade mark, copyright and patent law etc. Thus, there are numerous options for one to choose from. The eligibility to pursue LLB is 10+2. Course duration is 3-5 years and for a PG programme in law, the eligibility is LLB degree. Duration of LLM is two years. Once you pursue a course in law, you can opt for employment in different courts of law, in government service, as a law teacher, as a legal advisor to a company or a business house. One could also practice privately as a legal advisors advocate, solicitor etc.
On completion of the course, one can enroll with the local State Central Bar council. The Bar Council of India and the State Bar Councils are the statutory bodies that form a self regulated code of law for legal professionals practicing in India. Thus, all aspiring lawyers are required to enroll with these councils. Lawyers enjoy a position of reputation in the society and their services are required at different fronts in different situations of life. One falls back to the legal system when all else fails so the demand for legal practitioners is always high in society. During any dispute or a matter of legal concern, it is the duty of lawyers to counsel their clients about their legal rights. Lawyers suggest legal remedies and course of action in matters of contention. It is also the duty of lawyers to draw up legal documents like wills and contracts. Lawyers also represent clients in court and tribunal proceedings and conduct negotiations on behalf of their clients. .
To become a successful lawyer, just academic qualification is not sufficient. One needs to acquire professional competence through experience and practice under the mentorship of efficient lawyers. One learns the ropes of the profession and the shrewdness that is required with experience. The personal attributes that are required to be a good lawyer include communication skills, patience, logical reasoning, and a very good memory. A good lawyer would be well updated with the latest information on nay changes in law and would have done a fair amount of reading.
With a law degree, if one takes up additional qualification too, it will help in making the person eligible for a variety of employment opportunities such as government services where lawyers are appointed through UPSC and can join Indian Legal Service and serve as Law officers, Dy. Legal Advisors and Legal Advisors. One can also join judiciary where the posts are that of the magistrate, district and sessions judge, sub-magistrate, public prosecutor, solicitors, attorney general, advocate general, notary and oath commissioner. Then, there are law inspectors, legal officers in banks, judicial members of income tax, sales tax and excise departments, government advocates and staff in the registrar of companies’ office. Thus, there is no dearth of employment opportunities for those who have done law courses. With a law degree and an additional course, one can aspire to make a very successful career in the field of law.
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It is a spiritual law that the desire to do necessarily implies the ability to do.”
You have all read of “Aladdin’s Lamp,” which accomplished such wonderful things. This, of course, is only a fairy story, but it illustrates the fact that man has within him the power, if he is able to use it, to gratify his every wish.
If you are unable to satisfy your deepest longings it is time you learned how to use your God-given powers. You will soon be conscious that you have latent powers within capable when once developed of revealing to you priceless knowledge and unlimited possibilities of success.
Man should have plenty of everything and not merely substance to live on as so many have. All natural desires can be realized. It would be wrong for the Infinite to create wants that could not be supplied. Man’s very soul is in his power to think, and it, therefore, is the essence of all created things. Every instinct of man leads to thought, and in every thought there is great possibility because true thought development, when allied to those mysterious powers which perhaps transcend it, has been the cause of all the world’s true progress.
In the silence we become conscious of “that something” which transcends thought and which uses thought as a medium for expression. Many have glimpses of “that something,” but few ever reach the state where the mind is steady enough to fathom these depths. Silent, concentrated thought is more potent than spoken words, for speech distracts from the focusing power of the mind by drawing more and more attention to the without.
Man must learn more and more to depend on himself; to seek more for the Infinite within. It is from this source alone that he ever gains the power to solve his practical difficulties. No one should give up when there is always the resources of Infinity. The cause of failure is that men search in the wrong direction for success, because they are not conscious of their real powers that when used are capable of guiding them.
The Infinite within is foreign to those persons who go through life without developing their spiritual powers. But the Infinite helps only he who helps himself. There is no such thing as a Special “Providence.” Man will not receive help from the Infinite except to the extent that he believes and hopes and prays for help from this great source.
Concentrate on What You Want and Get It.
The weakling is controlled by conditions. The strong man controls conditions. You can be either the conqueror or the conquered. By the law of concentration you can achieve your heart’s desire. This law is so powerful that that which at first seems impossible becomes attainable.
By this law what you at first see as a dream becomes a reality.
Remember that the first step in concentration is to form a Mental Image of what you wish to accomplish. Thisimage becomes a thought-seed that attracts thoughts of a similar nature. Around this thought, when it is once planted in the imagination or creative region of the mind, you group or build associated thoughts which continue to grow as long as your desire is keen enough to compel close concentration.
Form the habit of thinking of something you wish to accomplish for five minutes each day. Shut every other thought out of consciousness. Be confident that you will succeed; make up your mind that all obstacles that are in your way will be overcome and you can rise above any environment.
You do this by utilizing the natural laws of the thought world which are all powerful.