The morphologies and hydration properties of Mg O expansive material at different curing temperatures were investigated. When the curing temperature varies from 25 ℃ to 50 ℃,the conductivity of Mg O rises from 40 to80 μs/cm,the hydration product of Mg O expansive material curing in water for 28 days is from 1.5—2 mm to 2—2.5 μm in length through SEM observation,and the expansion of pastes with 5% of the magnesium oxide is from0.36% up to 1.01%,it is increased by 2.78 times. When the content of cement paste increases to 95% and cured in water for 90 days,the brucite forms as hexaflaggy-shaped crystal,which is less than 0.1 μm and tends to aggregates.The effect of curing temperature on the hydration of Mg O expansive material is obvious.

the Research Center on Levee Safety Disaster Prevention, MWR (No. 2019004); High-level Talent Project Funding Scheme of Jiangsu (No. XCL-CXTD-007); China Postdoctoral Science Foundation (No. 2018M630559); the National Natural Science Foundation of China (No. 51908285); the Fundamental Research Nantong Metro Group Co., Ltd; the traffic construction science and technology project of Shanxi (No. 16-2-08) for its financial support in this project;

10.16356/j.1005-1120.2019.04.014

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