Influence of Wet-Dry Cycles on Compressive Strength of Calcium Carbide Residue–Fly Ash Stabilized Clay
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 4
Abstract
This article studies the durability of the calcium carbide residue (CCR) and fly ash (FA) stabilized silty clay against wetting and drying cycles to ascertain its performance in pavement applications. The durability test on the CCR-FA stabilized clay samples compacted on dry and wet sides of optimum was performed according to the ASTM. The mixture of CCR and FA can be used for soil stabilization instead of ordinary portland cement. The suitable ingredient of CCR, FA, and clay results in a moderately high strength and durability geomaterial. The durability against wetting and drying (w-d) cycles of the CCR stabilized clay is considered low according to the recommendations of the American Concrete Institute and the U.S. Army Corps of Engineers and is not accepted as a pavement material. The input FA at optimal content reacts with the excess from the CCR, and hence a significant improvement of the strength and durability. The optimal FA content is found at about 20%. The strength analysis shows that the durability is directly related to the unsoaked strength (prior to the w-d cycles). Consequently, a relationship between the w-d cycle strength and unsoaked strength is proposed. It is useful for quick determination of unsoaked strength during mix design to attain the target strength at the design service life.
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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 the Suranaree University of Technology, the Higher Education Research Promotion and National Research University Project of Thailand, Office of Higher Education Commission are appreciated.
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© 2013 American Society of Civil Engineers.
History
Received: Aug 27, 2012
Accepted: May 13, 2013
Published online: May 15, 2013
Discussion open until: Oct 15, 2013
Published in print: Apr 1, 2014
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