Effect of Curing Temperature on Hydration of Calcium Aluminate Cement–Calcium Sulfate–Limestone System
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 9
Abstract
The effect of curing temperature on hydration of a ternary blend of calcium aluminate cement (CAC), calcium sulfate (C$), and limestone (Cc) was examined. Compressive strength was evaluated at 1, 7, and 28 days. Hydration kinetics and products were assessed using calorimetry, thermogravimetric analysis, and X-ray powder diffraction. It was found that elevating the curing temperature from 5 to 50°C accelerated cement hydration. At 5 and 23°C, the incorporation of limestone caused a transformation of monosulfoaluminate into monocarboaluminate in the hydration product at 28 days. Higher curing temperatures (35–50°C), however, resulted in a collective increase in monosulfoaluminate, monocarboaluminate, and aluminum hydroxide, and led to a significant reduction in ettringite. Higher curing temperatures also led to an increase in aluminium hydroxide but did not form as much hydrogarnet () in the CAC-C$-Cc system as in the CAC-C$ system. This study provides a technical reference for practical design of materials based on the ternary binder system.
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Acknowledgments
The financial support of the CRSRI Open Research Program (Program SN: CKWV2017521/KY) and that of the National Natural Science Foundation of China (NSFC, No. 51579195) are greatly acknowledged.
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 9 • September 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Sep 11, 2017
Accepted: Mar 29, 2018
Published online: Jun 19, 2018
Published in print: Sep 1, 2018
Discussion open until: Nov 19, 2018
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