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Role of filter paper separators on the response of clays under long-duration sustained loading

Robinson, RG and Allam, MM (1998) Role of filter paper separators on the response of clays under long-duration sustained loading. In: Journal of Testing and Evaluation, 26 (05). pp. 463-466.

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In a one-dimensional consolidation test, a sustained load duration in excess of 10(4) min is rarely used for evaluation of the coefficient of secondary compression even for very plastic clays. However, there are instances in the literature where load durations have exceeded 10(5) min. The clogging of porous stones by migration of soil fines is conventionally prevented by interposing filter paper separators between the porous stones and the soil specimen. The present study examines the effect of filter paper separators on the secondary compression and swelling characteristics of a bentonite-sand mixture. In longterm volume change tests, use of filter paper separators results in increased deformation when the soil is undergoing drained creep in consolidation tests. When the soil undergoes swelling over a long period of time, some collapse occurs due to the decay of the filter paper separators. The observations of a long-duration drained creep test on this soil are used to explain the reported secondary compression behavior of some natural soils. The results of the study bring out the need to develop nondegradable separators for long-duration tests to protect porous stones from clogging with soil fines.

Item Type: Journal Article
Publication: Journal of Testing and Evaluation
Publisher: ASTM International
Additional Information: Copyright of this article belongs to ASTM International.
Keywords: filter paper separators;soil;sustained loading;secondary compression;swelling;biodegradation;organic matte.
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 21 Dec 2009 10:34
Last Modified: 21 Dec 2009 10:34
URI: http://eprints.iisc.ac.in/id/eprint/19136

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