硅烷偶联剂/偏高岭土基地聚合物水化热及动力学研究

doi:10.11896/cldb.19060055

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Abstract Akinetic study by hydration heat was reported to research the influences of different dosages and kinds of silane coupling agent on the hydration process of metakaolin-based geopolymer, and the micro-morphology of early hydration of geopolymer was analyzed by SEM-EDS. The results showed that the setting time of geopolymer with silane coupling agent was longer than that of neat geopolymer, and the setting time was prolonged with the increase of silane coupling agent. The hydration exothermic rate of geopolymer with silane coupling agent accelerated during the acceleration period and the exothermic rate of neat geopolymer is faster than that of geopolymer with silane coupling agent after entering the deceleration period. During this period, silane coupling agent inhibited the hydration process of geopolymer. The addition of silane coupling agent had little effect on the cumulative hydration heat of geopolymer and the cumulative hydration heat of samples was almost the same, the difference was less than 2%. The hydration process of geopolymer could be divided into acceleration, deceleration and stable periods by analyzing the hydration kinetic parameters. The hydration was controlled by chemical catalysis reaction during acceleration period and the strong chemical reaction occurred with the addition of silane coupling agent, which accelerated the hydration rate. The hydration products formed films on the surface of particles during the deceleration period, which increased the reaction resistance and retarded the reaction rate. During the stable period, the reaction process was controlled by diffusion mechanism. The addition of silane coupling agent didn't change the mineral composition of the hydration products of geopolymer by observing SEM images, but silane coupling agent acted as a bridge to make the structure of geopolymer more compact.

Key words： silane coupling agent metakaolin hydration heat hydration kinetics

Published: 14 July 2020

CLC number:

TU528.041

Fund:This work was financially supported by the National Natural Science Foundation of China (51672236).

About author:: Changsen Zhanggraduated from Wuhan Institute of Building Materials in 1982 (now Wuhan University of Technology) and served in School of Materials Science and Engineering, Yancheng Institute of Technology. His research interests are research of inorganic non-metallic materials, focusing on the preparation, characte-rization and application development of cementitious materials and eco-environmental materials. He has published more than 60 journal papers and applied 8 national invention patents.

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	ZHANG Changsen
	HU Zhichao
	WANG Xu
	ZHU Huajun
	YANG Xu
	GU Xuesu

Cite this article:

ZHANG Changsen,HU Zhichao,WANG Xu, et al. Hydration Heat and Hydration Kinetics of Silane Coupling Agent/Metakaolin Based Geopolymers[J]. Materials Reports, 2020, 34(14): 14105-14109.

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http://www.mater-rep.com/EN/10.11896/cldb.19060055 OR http://www.mater-rep.com/EN/Y2020/V34/I14/14105

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