Effective Void Ratio for Assessing the Mechanical Properties of Cement-Clay Admixtures at High Water Content
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 137, Issue 6
Abstract
Portland cement is widely used for the improvement of soft clay in many applications and construction methods. Because of the high initial water content of in situ soft clay, the additional water in the cement slurry to be mixed, and the added air in some applications, the mixtures have a high water content and void ratio in either almost-saturated or unsaturated conditions. The mechanical properties of cement-clay admixtures—including cement-treated clay and air-cement-treated clay—are affected by several parameters, e.g., mixing proportions, curing time, and the initial state of the mixture. To facilitate engineering decisions regarding mixing design and the development of a constitutive model, a single parameter that can characterize the mechanical properties of such mixed materials is advantageous. This paper recommends a parameter defined as the effective void ratio that could appropriately quantify the dependency of the mechanical properties of cement-clay admixtures on the influencing parameters on the basis of the results of unconfined compression, oedometer, and triaxial tests. The proposed parameter tends to capture the mechanical characteristics of cement-clay admixtures under different test conditions.
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Acknowledgments
The writers gratefully acknowledge the financial support of the Thailand Research fund (TRF) under TRF Senior Research Scholar Contract No. UNSPECIFIEDRTA5380002 and King Mongkut’s University of Technology Thonburi under a National Research University (NRU) project. They are also indebted to the Department of Highways, the Ministry of Transport, and Mr. Tapakorn Sittibun for providing facilities for the preparation of samples and assistance in carrying out the experiments.
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Information
Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 137 • Issue 6 • June 2011
Pages: 621 - 627
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Mar 1, 2010
Accepted: Oct 5, 2010
Published online: Oct 20, 2010
Published in print: Jun 1, 2011
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