In-situ X-ray Diffraction Analysis on the Role of Hardening Accelerator in Early Hydration of Cement
YU Xin1, YU Cheng1, JIANG Qian1, RAN Qianping1, LIU Jiaping2, YANG Bin3
1 State Key Laboratory of High Performance Civil Engineering Materials,Jiangsu Sobute New Materials Co. Ltd.,Nanjing 211103,China 2 School of Materials Science and Engineering,Southeast University,Nanjing 211189,China 3 China State Railway Group Co.,Ltd.,Beijing 100844,China
Abstract: This study investigated the effect of inorganic salt hardening accelerator (including sodium thiocyanate, sodium sulfate and sodium thiosulfate) on early age hydration of cement by means of in-situ XRD analysis and isothermal calorimetry. Analysis on the quantitative results of hydration samples in each group was also carried out. Results revealed that the three hardening accelerators with a proper dosage range were able to promote the hydration of C3S, C3A and C4AF and accelerate the hydration heat evolution in different degrees. Consequently, the degree of early age hydration of cement was improved. The conclusion drawn from quantitative results of in-situ hydration samples was in consistent with the variation law of isothermal calorimetry curve, indicating the effectiveness and reliability of in-situ XRD in investigating the early age hydration of cement.
余鑫, 于诚, 姜骞, 冉千平, 刘加平, 杨斌. 采用原位XRD研究早强剂对水泥早期水化的影响[J]. 材料导报, 2020, 34(2): 2058-2062.
YU Xin, YU Cheng, JIANG Qian, RAN Qianping, LIU Jiaping, YANG Bin. In-situ X-ray Diffraction Analysis on the Role of Hardening Accelerator in Early Hydration of Cement. Materials Reports, 2020, 34(2): 2058-2062.
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2020, Vol. 34 
