Volume : 3, Issue : 9, SEP 2017

ECONOMIC EVALUATION OF FLEXIBLE PAVEMENT WITH RESPECT TO FLY ASH AND LIME STABILIZATION OF EXPANSIVE SUB-GRADE SOIL IN VIJAYAWADA

A.SIVA NAGA RAJU, B.SRIKANTH

Abstract

Black cotton soils cover about 25 % of the total land area in India. They are problematic to civil engineering structures because they undergo large volume changes due to variations in water content. In order to improve their properties, different admixtures are used. Among them, fly ash, which is the byproduct of combustion of pulverized coal in thermal power plants is being increasingly used. In our report, the study carried out on the engineering properties of black cotton soil as affected by different percentages of a fly ash and combination of lime and fly ash. Lime and the natural soil both are easily available materials at the most of places. Fly ash is a waste product resulting from the combustion of powdered coal in the steel and the thermal power plants. It acts as a pozzolan with lime, yielding slow setting cement which has been found suitable for stabilizing most types of soils. Locally available soil stabilized with lime-fly ash (LF A) as admixtures results in economical construction of good roads especially in the area in the vicinity of steel and thermal power plants. Its use in the construction would indirectly help in solving the problem of disposal of huge quantities of generated fly ash, which is an industrial waste. The results show that adding fly ash and lime to black cotton soil not only helps to improve the engineering properties of black cotton soil but also helps in the utilization of fly ash which can reduce the disposal and pollution problems associated with fly ash.

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References

1. Balasubramanyam,A.S., Ting, W.H., Bergado.D.T. and Sivandran.c., (1990), “Engineering Behaviour of soils in southeast Asia”, A commemorative Vol of southeast Asian Geotechnical Society, PP.25-92 2. Brandal, H., (1981) “Alteration of soil parameters by stabilization with lime” X ICSMFE, STOCKHOLM, Vol.3, PP.587-594 3. Broms, B.B and Bowman, P.(1979), “Lime xolumns – A new foundation mothod” Journal of the Geotechnical Engg. Division ASCE. PP.92-93 4.Chowdary, A.K.,(1994), “Influence of Flyash on the characteristics of Expansive soil”, Indian Geotechnical conference,Warangal, PP.215-218 5. Clare, K.E. and Orchley , A.F.(16957), “Laboratory experiments in the stabilization of clays with hydrated lime”, Geotechnique, Vol 7,PP. 97-111. 6. CRRI Annular report (1980-81), “Specifications for rural road”, Nandawala, Haryana, P.43
7. CRRI-CBRI Collaborative Research project Report (1979), “Lime – Flyash stabilized soil for Road and Building construction”, May 1979. 8. Deshpande, M.D., Pandya, P.C., Shan,J.D., Vanjara, S.V.,(1990), “Performance study of road section constructed with local expansive clay (stabilized with lime) as sub base material”, Indian Highways Vol .7, No.4 PP.29-36 9. Evans,G.L.,Bell D.H.,(1981), “Chemical stabilization of Loess, Newzealand”, X ICSMFE, STOCKHOLM, Vol.3, PP.649-658 10. Grim,E.R.,(1953), a text book on clay mineralogy, McGraw Hill Publishing Co.,London.