Experimental Study on Effects of Casting Procedures on Compressive Strength, Water Permeability, and Interfacial Transition Zone Porosity of Rock-Filled Concrete
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 8
Abstract
This study investigated the effects of different casting procedures on compressive strength, water permeability, and interfacial transition zone (ITZ) porosity of rock-filled concrete (RFC). Mixes of concrete with the same proportions were cast using the self-compacting method (the casting procedure of RFC) and the vibration method (the casting procedure of normal concrete). A control group of concrete was prepared to reveal the effects of aggregate size. Compressive tests and water permeability tests were performed in accordance with the current codes. Scanning electron microscopy was used to calculate the porosity of the ITZ by processing the second electron and backscattered electron images of the ITZ. The findings indicate that the self-compacting method can improve compressive strength and particularly impermeability grade. Switching the vibration method to the self-compacting method also significantly reduces ITZ porosity, especially the ITZ porosity at the lateral surface of the aggregate.
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Acknowledgments
We thank the National Natural Science Foundation of China (Grant No. 51239006) and the National 863 Technology Research and Development Program of China (No. 2012AA06A112) for its financial support and the Ph.D. candidates Chuanhu Zhang and Xiaorong Xu for their help.
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Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 8 • August 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Apr 28, 2015
Accepted: Dec 1, 2015
Published online: Mar 1, 2016
Published in print: Aug 1, 2016
Discussion open until: Aug 1, 2016
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