恒湿与变湿养护条件下MgO膨胀剂对水泥砂浆膨胀性能的影响分析

doi:10.11896/cldb.24020085

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Abstract Crack control and performance optimization in cement-based materials are pivotal goals in the field of civil engineering. While traditional shrinkage compensation methods are somewhat effective, they are limited by high costs and application constraints. Magnesium oxide (MgO) expansive agents have recently garnered widespread attention due to their cost-effectiveness and efficiency. However, research on the performance and compensation mechanisms of MgO under varying humidity conditions remains insufficient. This study focuses on the performance of cement-based materials incorporated with MgO under constant and variable moisture curing regimes. By examining the restrained expansion rate, mineral composition of hydration products, morphology, and distribution, as well as the hydration degree of MgO, this work delves into the humidity sensitivity of MgO in cement-based materials. Findings indicate that the restrained expansion rate of cement mortar containing 8% M-type MgO increases with the curing humidity, with a critical threshold humidity of 80% for expansion and shrinkage. The stability of the cement mortar with 8% M-type MgO is maintained under both high humidity-slow cycle and low humidity-fast cycle curing regimes. The reaction degree of the MgO expansive agent in cement paste increases with humidity, ranging from 20%—45%. The product Mg(OH)₂ primarily forms around the MgO particles in a gel state, transforming into rod-shaped crystals as the humidity reaches 100%.

Key words： cement-based material crack control MgO expansive agent humidity sensitivity variable moisture curing compensation effect

Published: 10 April 2025 Online: 2025-04-10

CLC number:

TU526

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	Articles by authors
	LIU Kuisheng
	CUI Yong
	YU Xiao
	LUAN Haitao
	SONG Qida
	CHEN Jiajun
	MA Zixiang
	FANG Kuizhen

Cite this article:

LIU Kuisheng,CUI Yong,YU Xiao, et al. Analysis of the Effect of MgO Expansive Agent on the Expansion Performance of Cement Mortar Under Constant and Variable Humidity Curing Conditions[J]. Materials Reports, 2025, 39(7): 24020085-7.

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https://www.mater-rep.com/EN/10.11896/cldb.24020085 OR https://www.mater-rep.com/EN/Y2025/V39/I7/24020085

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