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Volume change behavior of lime treated gypseous soil - influence of mineralogy and microstructure

Jha, Arvind Kumar and Sivapullaiah, PV (2016) Volume change behavior of lime treated gypseous soil - influence of mineralogy and microstructure. In: APPLIED CLAY SCIENCE, 119 (2). pp. 202-212.

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Official URL: http://dx.doi.org/10.1016/j.clay.2015.09.017

Abstract

Series of oedometer tests and micro-analytical studies (XRD, SEM and EDAX) have been carried out to investigate the influence of varying gypsum content on swell, compressibility and permeability of lime treated montmorillonitic soil after curing for different period. Immediate swell is observed on inundation of compacted samples with water and continuously increased with gypsum content. However, changes in swell are found to be marginal with curing. This is attributed to the formation and growth of ettringite crystals by ionic reactions of aluminum calcium-sulfate in the presence of water which is confirmed through detailed micro-analysis. The higher swell in uncured specimens and gradual reduction in swell with increase in curing periods are due to relative dominance of formation and growth of ettringite and cementitious compounds, respectively. Also, the ionic reaction products are found to bear a significant influence on the compressibility and permeability behavior. (C) 2015 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Keywords: Cementitious; Compressibility; Ettringite; Hydration; Swell
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Depositing User: Id for Latest eprints
Date Deposited: 14 Jan 2016 05:08
Last Modified: 14 Jan 2016 05:08
URI: http://eprints.iisc.ac.in/id/eprint/53075

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