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Fly ash wealth or waste

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  • 1. FLY ASH – WEALTH OR WASTE
  • 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. 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. 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. 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. 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. 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. 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. 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. • 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.  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. • 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. 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. CONCLUSION Let Us Harness A Billion Dollar Resource That Has Been Wasted So Far