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Enhancement of Strength of Soft Soils with Fly ash and Lime

Sivapullaiah, PV and Katageri, Basavaraj and Herkal, RN (2007) Enhancement of Strength of Soft Soils with Fly ash and Lime. In: Sri Lankan Geotechnical Society's 1st Int. Conf. on Soil & Rock Engg., Colombo, Colombo.

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Disposal of large quantities of fly ash poses a major environmental problem. To enhance its utilization, fly ash is considered for stabilizing of expansive soft soils. Improving the strength of soil, which is of major importance, depends on the pozzolanic nature of fly ash. Fly ashes with high pozzolanic reactivity are widely used but those with less pozzolanic reactivity are greatly inhibited. As the strength development in natural expansive soil considered in this investigation is very less with different percentages of fly ash, an attempt is made to increase the same by addition of lime along with fly ash. Based on several tests conducted, the optimum lime contents for fly ash and soils are 5% and 8% respectively. The strength of compacted soil with different fly ash contents of 10 to 40% with lime contents of 5% and 8% are determined after curing for different periods. The strength improvement for any soil-fly ash mixture, which is substantial with 5% of lime, is further improved with 8% of lime. The strength of soil-fly ash mixtures with any lime content increases with curing period.

Item Type: Conference Paper
Keywords: lime;fly ash;strength characteristics;curing period;soft soils
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 03 Nov 2011 06:01
Last Modified: 03 Nov 2011 06:01
URI: http://eprints.iisc.ac.in/id/eprint/41697

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