Study on Carbonation Characteristics of γ-C2S with the Addition of MgCl2 at -10 ℃
TAN Yicheng1,2, LIU Zhichao1,2,*, WANG Fazhou1,2
1 State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China 2 School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
Abstract: γ-C2S is a highly reactive carbonatable binder and its carbonation reaction exhibits low susceptibility to environmental temperature, thus hol-ding great promises in the preparation of construction materials for sub-freezing temperatures. This work studies the carbonation characteristics of γ-C2S cured at -10 ℃ of different MgCl2 concentrations, including temperature change during carbonation curing, phase assemblage, compressive strength and degree of carbonation (DOC) evolution and microstructure after carbonation curing for different durations. Results indicated γ-C2S showed a very slow compressive strength development at -10 ℃, only 10.83 MPa after 24 h. The presence of MgCl2 significantly enhanced the early-age and later-age compressive strength with the maximum compressive strength being 22.14 MPa and 178.56 MPa after 0.5 h and 24 h, respectively. Carbonation products of γ-C2S cured at -10 ℃ consisted of calcite as the dominant polymorph of calcium carbo-nate and a trace amount of aragonite as well. The addition of MgCl2 led to the formation of Mg-calcite as a result of the substitution of Ca2+ by Mg2+. When MgCl2 was added to γ-C2S, the freezing point of the pore solution is lowered to such an extent that unfrozen liquid exists at -10 ℃, which provided the environment for carbonation reaction. Meanwhile, the presence of MgCl2 promotes the dissolution of Ca2+ and thus the carbonation reactivity. This synergistic effect accounts for the excellent mechanical performance of γ-C2S cured at -10 ℃.
谭益成, 刘志超, 王发洲. -10 ℃条件下掺氯化镁溶液的γ-C2S碳化性能研究[J]. 材料导报, 2023, 37(1): 22010270-7.
TAN Yicheng, LIU Zhichao, WANG Fazhou. Study on Carbonation Characteristics of γ-C2S with the Addition of MgCl2 at -10 ℃. Materials Reports, 2023, 37(1): 22010270-7.
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2023, Vol. 37 
