Volume Change Behavior of Fly Ash-Stabilized Clays
Publication: Journal of Materials in Civil Engineering
Volume 19, Issue 1
Abstract
This paper presents, by way of comparison, the effect of fly ash on the volume change of two different types of clay, one a highly plastic expansive clay and the other a nonexpansive clay, also of high plasticity. Expansive clays swell on absorbing water and shrink on drying. Nonexpansive clays undergo large compression at high water contents. The effect of fly ash content on free swell index, swell potential, and swelling pressure of expansive clays was studied. Compression index and secondary consolidation characteristics of both expansive and nonexpansive clays were also determined. Swell potential and swelling pressure, when determined at constant dry unit weight of the sample (mixture), decreased by nearly 50% and, when determined at constant weight of clay, increased by nearly 60% at 20% fly ash content. Compression index and coefficient of secondary consolidation of both the clays decreased by 40% at 20% fly ash content.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 19 • Issue 1 • January 2007
Pages: 67 - 74
Copyright
© 2007 ASCE.
History
Received: Feb 11, 2005
Accepted: Jul 29, 2005
Published online: Jan 1, 2007
Published in print: Jan 2007
Notes
Note. Associate Editor: Hilary I. Inyang
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