Swelling Characteristics of Bentonite Clay Mats

Diman, Siti F. and Wijeyesekera, D.Chitral (2008) ‘Swelling Characteristics of Bentonite Clay Mats’,

Diman, SF (2008) AC&T 179-85.pdf - Published Version
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Bentonite absorbs water to a greater extent than any other ordinary plastic clay and as a consequence it swells depending on the change in its moisture content. This paper aims to give an overview of the swelling characteristic of bentonites with particular observations from that of prehydrated clay mats. How the swelling characteristics vary with the type of clay, water, and the encompassing boundary materials is presented. Accordingly, it examines the swelling response of the clay mat and the pressure exerted when the swelling is both fully and partially restrained. The development of a new apparatus to measure pressures exerted by the clay as a result of the swelling process is also described. A theoretical study is made to postulate how these pressures can be evaluated for field situations. Though bentonites are known to have very high swelling pressures, how this is negated by the compressibility of the composite behaviour with the necessary backfill is demonstrated. Tests show significant differences in swelling behaviour and pressure development when the GCL is in deionized water and sea water environments. Free swell characteristics were similarly affected.. Unique variation of pressure exerted due to swelling in partially restrained conditions was established with experimental observations made during the study.

Item Type: Conference or Event Item (Paper)
Divisions: Schools > Architecture Computing and Engineering, School of
Depositing User: Mr Stephen Grace
Date Deposited: 08 Jun 2010 09:33
Last Modified: 27 Sep 2012 11:59
URI: http://hdl.handle.net/10552/781

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