Mechanism of improvement in the strength and volume change behavior of lime stabilized soil

Jha, Arvind Kumar and Sivapullaiah, PV (2015) Mechanism of improvement in the strength and volume change behavior of lime stabilized soil. In: ENGINEERING GEOLOGY, 198 . pp. 53-64.

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Abstract

An attempt has been made to bring out the influence on strength and volume change behavior of fabric changes and new cementitious compound formation in a soil upon addition of various lime contents and with curing periods. The effects of changes in fabric of treatment with various lime contents (0, 2,4 and 6%) and with curing periods (0, 7, 14 and 28 days) have been evaluated by one-dimensional consolidation tests, in terms of void ratio changes and compressibility. The strength of soil treated with different lime contents with curing periods up to 28 days, and with the optimum lime content of 6% up to one year has been determined by unconfined compression tests. Comparison of effects of lime on the strength and volume change behavior of the soil brings out that the formation of flocculated fabric and cation exchange significantly reduces the compressibility of soil but marginally increases the strength. Cementation of soil particles and filling with cementitious compounds of the voids of flocculated fabric in the soil marginally reduces the compressibility but significantly increases the strength. Thus, the mechanism of volume change behavior of soil treated with lower lime content at short curing periods is distinctly different from that of the soil treated with optimum lime content at longer curing periods. This is consistent with the increase in the permeability caused by the addition from 2 to 4% lime and the decrease following the addition of 6% lime. Changes consistent with mechanical behavior have been determined by scanning electron microscope, X-ray diffraction and thermal analyses, energy dispersive X-ray spectrometer and pH value in microstructure, mineralogy, chemical composition and alkalinity, respectively. (C) 2015 Published by Elsevier B.V.

Item Type:	Journal Article
Publication:	ENGINEERING GEOLOGY
Publisher:	ELSEVIER SCIENCE BV
Additional Information:	Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Keywords:	Compressibility; Fabric; Microstructure; Mineralogy; Strength; Thermogravimetry
Department/Centre:	Division of Mechanical Sciences > Civil Engineering
Date Deposited:	30 Dec 2015 06:03
Last Modified:	30 Dec 2015 06:03
URI:	http://eprints.iisc.ac.in/id/eprint/52940

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