Fly ash wealth or waste

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Fly ash wealth or waste

  1. 1. FLY ASH – WEALTH OR WASTE
  2. 2. FLY ASH  Fly ash, a principal byproduct of coal burning power plants, is an industrial waste product containing large amounts of silica, alumina and small amount of unburned carbon, which pollutes environment. This fly ash has real disposal problems, and should hence be utilized effectively for various purposes.
  3. 3. Fly ash, being primarily pozzolanic, can actually replace a percentage of the Portland cement, to produce a stronger, more durable and more environment friendly concrete.  The cement production process releases a lot of carbon-di- oxide in atmosphere, which is the primary green house gas that causes global warming.  Hence replacement of a considerable portion of cement by fly ash, can make a major contribution toward solving the global warming problem.
  4. 4. ASH PRODUCTION IN INDIA YEAR ASH PRODUCED IN MILLION TONES ASH USED IN MILLION TONES 2006-07 116 24.80 2007-08 123 27.15 2008-09 130 29.68 2009-10 138 32.21 2010-11 145 34.74 2011-12 154 38.00 2012-13 163 42.50 PROJECTED VALUE OF FLY ASH UTILISATION 2013-14 173 48.00
  5. 5. ASH WITH PORTLAND CEMENT CONCRETE Fly ash can be used with Portland Cement Concrete as a cement extender to enhance the performance of the concrete. Some of the resulting benefits are: • Higher Ultimate Strength • Increased Durability, • Improved Workability • Reduced Bleeding • Increased Resistance To Sulfate Attack • Reduced Shrinkage
  6. 6. FLY ASH BRICKS Fly ash possesses both ceramic as well as pozollanic properties and therefore can be utilized in a unique way for manufacturing bricks. This proves to be very useful for building construction. These bricks produced by the new process are superior in quality as they offer higher cold crushing strength and smooth, uniform size.
  7. 7. S.NO FEATURES NORMAL CLAY BRICKS FLY ASH BRICKS 1 BINDING LIGHT DENSE 2 COLOUR VARY UNIFORM 3 SHAPE IRREGULAR UNIFORM 4 WEIGHT MORE LESS 5 COMPRESSIVE STRENGTH 35 KGS/SQ.CM 100 KGS/SQ.CM 6 WATER ABSORPTION 20-25% 6-12%
  8. 8. ECONOMIC SAVINGS: Reduces excavation of clay. Low cost of brick as compared to clay brick as same quality. Number of bricks required per unit volume of construction is less. Less consumption of mortar. Less number of joints in case of blocks. Plastering is not required if it required
  9. 9. FLY ASH FOR ROAD Fly ash can be used for construction of road and embankment. This utilization has many advantages over conventional methods. • Saves top soil which otherwise is conventionally used . • Avoids creation of low lying areas (by excavation of soil to be used for construction of embankments) . • Avoids recurring expenditure on excavation of soil from one place for construction and filling up of low lying areas thus created
  10. 10. • Does not deprive the nation of the agricultural produce that would be grown on the top soil which otherwise would have been used for embankment construction. • Reduces the demand of land for disposal/deposition of fly ash that otherwise would not have been used for construction of embankment. Good Compaction . • Free draining ( Less interruption due to raining ). • Light in weight ( can be used in weak sub – grade )
  11. 11.  The superior benefits of PFA as a fill material come from its lower density when compared to soils. PFA has a density of 1.5Mg/m3 compared to around 2Mg/m3 for soils.  The benefits of PFA as a fill material include: • Reduced settlement in poor underlying soils. • Lightweight and therefore leads to savings in materials and haulage costs. For example, there is approximately a 25% reduction in lorry movements FLY ASH AS FILL MATERIAL
  12. 12. • Increased stability as its self-supporting properties provide stable conditions for shallow trenches and other excavations • Immediate and increasing strength. For example, field tests on existing embankments have demonstrated the positive strength gain and long-term stability of PFA. In addition, PFA will absorb water and therefore is not easily saturated, allowing construction work to continue in bad weather conditions • No internal settlement
  13. 13. SOIL STABILIZATION • Soil stabilization is the alteration of soil properties to improve the engineering performance of soils. • Modification of soil properties is the temporary enhancement of subgrade stability to expedite construction. • Stabilization can increase the shear strength of a soil and/or control the shrink-swell properties of a soil, thus improving the load-bearing capacity of a sub-grade to support pavements and foundations. • Stabilization can be used to treat a wide range of sub-grade materials from expansive clays to granular materials.
  14. 14. CONCLUSION Let Us Harness A Billion Dollar Resource That Has Been Wasted So Far

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