16-11-2012, 12:20 PM
ENGINEERING PROPERTIES OF VTPS FLYASH
[attachment=39743]
ABSTRACT:
In this paper we found the suitability of Fly ash by finding out the Specificgravity, by doing sieve analysis, Compaction and Shear test .We did Heavy and Light compaction and represented it on a graph which we compared with the IISC Bangalore and IIT Delhi graphs. For a given compaction energy, fly ash attains the maximum dry density at a particular moisture content i.e., optimum moisture content.
From the values of Shear strength we made graphs with different moisture contents and we finally made a conclusion that Fly ash can be made used in Rising Embankment and filling materials etc. Technological solutions for increasing the utilization of ash as well as safe management of unutilized ash deposits are the two imperatives of the immediate future.
TYPES OF FLY ASH
Three categories of ash available from thermal power stations:
1.Dry Fly Ash: Collected from different rows of electrostatic precipitators in dry form. It is used for manufacture of Portland cement, pozzolana cement, cement concrete, mortar, lime fly ash bricks, building blocks etc.
2.Bottom Ash: Collected at bottom of bottle furnace characterized by better geotechnical properties. Good material for fill, road and embankment construction.
3.Pond Ash: Fly ash and bottom ash are mixed together with water to form that is pumped to the ash pond area. In such ash pond area, ash gets settled and excess water is decanted. This deposited ash is pond ash. It is being used as filling material including embankment and road construction. Selected pond ash can be used for manufacture of building products like lime fly ash bricks and blocks.
SPECIFIC GRAVITY:
Specific gravity is the ratio of mass/weight in air of a given volume of dry fly ash to the mass/weight of equal volume of distilled water. Specific gravity value gives an idea about the suitability of the fly ash as a construction material; higher value of specific gravity gives more strength if used in the construction of roads and for various constructions.
Compaction:
Compaction is the process of densification of fly ash by reducing air voids.
Compaction is the important property, which gives the optimum moisture content, and maximum dry density of fly ash by Proctor Compaction Test.
The degree of compaction of the fly ash is measured in terms of its dry density. It mainly depends upon its moisture content, compaction energy and type of fly ash.
For a given compaction energy, fly ash attains the maximum dry density at a particular moisture content i.e., optimum moisture content.
CONCLUSION
Fly ash is found to be having MDD of 1.103g/cc. Based on the above aspect of fly ash; it can be used in the embankment construction. Pond ash is having angle of friction value of 30 degrees. From IRC specifications of embankment the value 1.103g/cc is >0.95g/cc, so for this value we can construct or raise any embankment for a height of more than 7m.
Also it can be used for various geotechnical constructions such as filling material, rising of ash dykes etc.
Technological solutions for increasing the utilization of ash as well as safe management of unutilized ash deposits are the two imperatives of the immediate future.
[attachment=39743]
ABSTRACT:
In this paper we found the suitability of Fly ash by finding out the Specificgravity, by doing sieve analysis, Compaction and Shear test .We did Heavy and Light compaction and represented it on a graph which we compared with the IISC Bangalore and IIT Delhi graphs. For a given compaction energy, fly ash attains the maximum dry density at a particular moisture content i.e., optimum moisture content.
From the values of Shear strength we made graphs with different moisture contents and we finally made a conclusion that Fly ash can be made used in Rising Embankment and filling materials etc. Technological solutions for increasing the utilization of ash as well as safe management of unutilized ash deposits are the two imperatives of the immediate future.
TYPES OF FLY ASH
Three categories of ash available from thermal power stations:
1.Dry Fly Ash: Collected from different rows of electrostatic precipitators in dry form. It is used for manufacture of Portland cement, pozzolana cement, cement concrete, mortar, lime fly ash bricks, building blocks etc.
2.Bottom Ash: Collected at bottom of bottle furnace characterized by better geotechnical properties. Good material for fill, road and embankment construction.
3.Pond Ash: Fly ash and bottom ash are mixed together with water to form that is pumped to the ash pond area. In such ash pond area, ash gets settled and excess water is decanted. This deposited ash is pond ash. It is being used as filling material including embankment and road construction. Selected pond ash can be used for manufacture of building products like lime fly ash bricks and blocks.
SPECIFIC GRAVITY:
Specific gravity is the ratio of mass/weight in air of a given volume of dry fly ash to the mass/weight of equal volume of distilled water. Specific gravity value gives an idea about the suitability of the fly ash as a construction material; higher value of specific gravity gives more strength if used in the construction of roads and for various constructions.
Compaction:
Compaction is the process of densification of fly ash by reducing air voids.
Compaction is the important property, which gives the optimum moisture content, and maximum dry density of fly ash by Proctor Compaction Test.
The degree of compaction of the fly ash is measured in terms of its dry density. It mainly depends upon its moisture content, compaction energy and type of fly ash.
For a given compaction energy, fly ash attains the maximum dry density at a particular moisture content i.e., optimum moisture content.
CONCLUSION
Fly ash is found to be having MDD of 1.103g/cc. Based on the above aspect of fly ash; it can be used in the embankment construction. Pond ash is having angle of friction value of 30 degrees. From IRC specifications of embankment the value 1.103g/cc is >0.95g/cc, so for this value we can construct or raise any embankment for a height of more than 7m.
Also it can be used for various geotechnical constructions such as filling material, rising of ash dykes etc.
Technological solutions for increasing the utilization of ash as well as safe management of unutilized ash deposits are the two imperatives of the immediate future.