Optimum Mix Design for Internally Integrated Concrete with Crystallizing Protective Material
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 7
Abstract
In this research, a silica-based crystallizing protective material was integrated into a fresh concrete mix to evaluate its efficacy in reducing water absorption while preserving the compressive strength level of the mixture. An optimum concrete mix design was determined, by producing several concrete mixes with different water-to-cement ratios (w/c) of 0.32, 0.37, 0.40, and 0.46, and treated with 2% and 4% of the crystallizing admixture. Water absorption and the mechanical properties of the treated and control mixes were measured, using the initial surface absorption test (ISAT) and the compressive strength and the flexural strength tests, respectively. Results showed that it is possible to obtain a water-resistant concrete without compromising its compressive strength if the right w/c ratio was used and the proper dosage of the crystallizing material was added. In addition, results revealed that treatment is beneficial only in the case of producing concrete with low w/c ratios of 0.32 and 0.37 and treated with crystallizing material. The compressive strength can increase up to 42% and with a significant drop in water absorption reaches 65%. Treated concrete was analyzed thoroughly under the scanning electron microscope (SEM) and X-ray diffraction (XRD) instrument to show the development of crystals with time and their interaction with the concrete mix.
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Acknowledgments
The authors appreciate the contribution of International Chem-Crete Corporation, Richardson, Texas, United States, for providing the admixture for studying. The first author acknowledges the financial support provided by Mutah University, Jordan. Also, the authors acknowledge the contribution of the Experimental Technique Centre ETC at Brunel University London for providing their facilities to support this research. The help and support of Mr. Neil Macfadyen, Chandni Hirani and Dr. Omar Abo Madyan are highly appreciated.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 7 • July 2019
Copyright
©2019 American Society of Civil Engineers.
History
Received: Mar 15, 2018
Accepted: Nov 14, 2018
Published online: Apr 26, 2019
Published in print: Jul 1, 2019
Discussion open until: Sep 26, 2019
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