Stabilisation of rice husk ash for use as cushion below foundations on expansive soils

Sivapullaiah, PV and Rao, Subba KS and Gurumurthy, JV (2004) Stabilisation of rice husk ash for use as cushion below foundations on expansive soils. In: Ground Improvement, 8 (4). pp. 137-149.

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Abstract

Placing a cushion between the expansive soil and the foundation is an attractive proposal for overcoming the problems associated with construction of structures over expansive soils such as Indian black cotton soil. Extensive studies on cohesive non-swelling soil as a cushion have shown that it is ineffective over cycles of swelling and shrinkage of soil. The present paper explores the possibility of using rice husk ash (RHA) as a cushion. It was found that RHA stabilised with 3–9% of lime (LSR) or 10% of cement (CSR) and cured for about a week develops the properties required for an effective cushion material. Stabilised RHA reduces the bandwidth of vertical movements in expansive soil not only during the first cycle of swelling but also during subsequent cycles of swelling and shrinkage. The reduction increases with the thickness of the cushion. However, it is found that the middle level between the equilibrium swollen and equilibrium shrunken levels, called the operating level, decreases with the use of LSR/CSR as a cushion. LSR is more effective than CSR.

Item Type:	Journal Article
Publication:	Ground Improvement
Publisher:	Thomas Telford
Additional Information:	Copyright of this article belongs to Thomas Telford.
Keywords:	Cement;Expansive soil;Lime;Rice husk ash;Unconfined compressive strength
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	10 Apr 2007
Last Modified:	19 Sep 2010 04:32
URI:	http://eprints.iisc.ac.in/id/eprint/8749

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