以不同沉淀剂制备了碱式碳酸镁前驱体，讨论了前驱体制备温度和制备时间对得到的氧化镁的影响。

The effect of preparation temperature and aging time of the precursor on the properties of the resulting MgO was studied.

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最后结合掺氧化镁混凝土的抗拉强度试验曲线，根据数值模拟结果，对长沙拱坝的裂缝成因进行了初步分析。

At last, the causes of cracks of Changsha arch dam are given based on the numerical simulation results together with the strength curves of experiment of MgO concrete.

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晶粒细小，结构疏松，应变能大的氧化镁粉末具有较高的活性。

MgO powders, with small particle size, loose structure and high strain energy, have high activity.

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