-10 ℃条件下掺氯化镁溶液的γ-C<sub>2</sub>S碳化性能研究

doi:10.11896/cldb.22010270

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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 ℃.

Key words： γ-C₂S negative temperature building material carbonation curing MgCl₂ compressive strength

Published: 10 January 2023 Online: 2023-01-31

CLC number:

TU528

Fund:National Natural Science Foundation of China (U2001227).

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	TAN Yicheng
	LIU Zhichao
	WANG Fazhou

Cite this article:

TAN Yicheng,LIU Zhichao,WANG Fazhou. Study on Carbonation Characteristics of γ-C₂S with the Addition of MgCl₂ at -10 ℃[J]. Materials Reports, 2023, 37(1): 22010270-7.

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http://www.mater-rep.com/EN/10.11896/cldb.22010270 OR http://www.mater-rep.com/EN/Y2023/V37/I1/22010270

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