中文摘要：

为了探索混凝土中外掺氧化镁安定掺量的新方法,开展了水灰比对外掺氧化镁的介质（水泥净浆、砂浆、一级配混凝土、二级配混凝土）压蒸膨胀率影响的试验研究。结果表明：水灰比对外掺氧化镁的介质压蒸膨胀率有重要影响;试体的压蒸膨胀率随着水灰比的增大而减小;压蒸膨胀率随着水泥净浆、一级配混凝土、水泥砂浆、二级配混凝土的顺序依次递减。

英文摘要：

For searching the new approach on balanced content of magnesium oxide in concrete,the influence of water cement ratio on pressure-braise expansion rate of medium（cement paste,mortar,one grading and two grading concrete） with magnesium oxide is tested.The results show that the influence of water cement ratio on pressure-braise expansion rate of medium with magnesium oxide is very important.The pressure-braise expansion rate is reduced with water cement ratio increasing.The pressure-braise expansion rate is increasingly decreasing with order of cement paste,one grading,mortar,two grading concrete.