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Effect of heat-treatment on strength of clays

Joshi, RC and Achari, G and Horsfield, D and Nagaraj, TS (1994) Effect of heat-treatment on strength of clays. In: Journal of gotechnical and geoenvironmental engineering, 120 (6). pp. 1080-1088.

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Abstract

The main objective of this investigation was to understand the strength development of clays below fusion or vitrification temperatures of 900°C. The other objective was to establish threshold temperatures to produce a satisfactory construction material from clayey sediments from the Western Beaufort Sea for shore protection of artificial islands with minimum expense of thermal energy. Studies were, therefore, conducted using kaolinite, bentonite, and a clayey sediment from the Beaufort Sea. Unconfined-compressive-strength tests were conducted on clay samples heat treated from 110 to 700°C. Furthermore, to understand the factors responsible for strength-development-thermogravimetric studies and pore-size analysis, using mercury porosimetry, were also conducted. A gradual increase in strength was obtained with an increase in firing temperature. However, substantial and permanent increase in strength occurred only after dehydroxylation of all the clays studied; Clay samples heated to temperatures above dehydroxylation became resistant to disintegration upon immersion in water. Results indicate that the clayey sediments from Western Beaufort Sea have to be heat treated to about 600°C to produce granular material for use as a fill or shore-protection material for artificial islands.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American society of civil engineers.
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 04 Aug 2011 05:33
Last Modified: 04 Aug 2011 05:33
URI: http://eprints.iisc.ernet.in/id/eprint/36430

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