Hydration Heat and Hydration Kinetics of Silane Coupling Agent/Metakaolin Based Geopolymers
ZHANG Changsen1, HU Zhichao1, 2, WANG Xu1, 3, ZHU Huajun1, YANG Xu1, GU Xuesu1
1 School of Materials Science and Engineering, Yancheng Institute of Technology, Yancheng 224051, China 2 School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013, China 3 School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China
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.
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2020, Vol. 34 
