Abstract: The composition mechanism of polycarboxylate superplasticizers and early strength agent is not well studied, especially the hydration process. In this study, the organic and inorganic early strength agents were compounded, followed by the measurement of the cement paste fluidity, cement mortar strength and viscosity. The test of cement hydration heat, XRD, TG-DTA were used to demonstrate the hydration process. According to the research, the introduce of inorganic early strength agent such as sodium thiosulfate and calcium chloride could destroy the steric hindrance effect, leading to the significant decrease of the water-reducing rate of polycarboxylate superplasticizers. However, calcium formate, sodium thiocyanate and triethanolamine showed almost no effect on water-reducing rate. According to the test result of hydration heat of cement during 24 h, the hydration degree of cement paste can be improved during the hydration acceleration by adding early strength agent. As shown in the XRD and TG-DTA analysis, early strength agent could increase the formation of AFt, calcium hydroxide and C-S-H gel in 3 d hydration, but showed little effect on the 28 d hydration.
都蓉蓉, 张雄, 顾明东, 季涛. 聚羧酸减水剂与增强组分的复合效应及原理[J]. 材料导报, 2019, 33(14): 2461-2466.
DU Rongrong, ZHANG Xiong, GU Mingdong, JI Tao. The Composition Effect and Mechanism of Polycarboxylate Superplasticizers and Early Strength Agent. Materials Reports, 2019, 33(14): 2461-2466.
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2019, Vol. 33 
