Engineering Properties of Silty Clay Stabilized with Calcium Carbide Residue
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 5
Abstract
Calcium carbide residue (CCR) is a waste product from acetylene gas factories, which is rich in calcium hydroxide []. Because clayey soils contain high amount of natural pozzolanic materials (silica and alumina), CCR can be used as a soil stabilizer. This article presents the engineering properties of CCR-stabilized silty clay to ascertain its performance in pavement base and subbase applications. The input of CCR, which reduces the plasticity index of the clay, increases the optimum water content (OWC) and decreases the maximum dry unit weight () of the stabilized clay. The CCR fixation point, simply obtained from the index test, is proved as a practical indicator for determining the CCR content to obtain the required engineering properties at a particular molding water content. The state of water content controls the densification, chemical reaction, and water absorption capacity. The soaked engineering properties are thus dependent upon the state of water content. For a particular CCR content, the optimum water content is the most appropriate in terms of strength, swelling and collapse behaviors, and bearing capacity. The lower water content is not sufficient for the chemical reaction, while the higher water content yields a higher water/binder ratio. The water absorption is smallest for the CCR-stabilized samples compacted at the OWC. To conclude, the optimal mix proportion is the CCR fixation point at OWC. CCR stabilization is more effective than lime stabilization in terms of engineering, economic, and environmental viewpoints.
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Acknowledgments
The first author thanks the Office of the Higher Education Commission, Thailand, for Ph.D. study financial support under the program Strategic Scholarships for Frontier Research Network. The financial support and facilities provided by Suranaree University of Technology and the Higher Education Research Promotion and National Research University Project of Thailand, Office of Higher Education Commission are appreciated. The authors also appreciate the reviewers’ excellent comments, which improved the quality of the paper.
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Published In
Journal of Materials in Civil Engineering
Volume 25 • Issue 5 • May 2013
Pages: 632 - 644
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Feb 13, 2012
Accepted: Jun 14, 2012
Published online: Aug 28, 2012
Published in print: May 1, 2013
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