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中文摘要：
研究MgO膨胀剂（MEA）对C70混凝土和易性、抗压强度和变形的影响，MEA活性指数为40、133s，掺量为0、4％、6％、8％、12％。结果表明：外掺MEA对C70混凝土扩展度和坍落度影响不大。掺MEA-40和MEA．133混凝土在掺量为8％时7、28d抗压强度最高。MEA掺量相同时，掺MEA-133混凝土7、28d抗压强度均高于掺MEA-40混凝土强度。掺MEA对置于室外暴露条件下C70混凝土收缩的补偿作用明显。150d内，同龄期同掺量时，MEA．40对混凝土收缩的补偿效果优于MEA-133。由150d数据看出，掺6％MEA．133和掺4％MEA-40对混凝土的补偿效果较好。
英文摘要：
Effect of MgO-based expansive agent （MEA）on workability, compression strength and deformation of C70 concrete was in- vestigated in this paper.The activity values of MEA used were 40 s and 133 s, and the amount of MEA added in concrete were 0,4%, 6%, 8% and 12% ,respectively.Results showed that the MEA had little influence on the workability of C70 concrete.7 day and 28 day＇s compression strength of adding with MEA-40 and MEA-133 concrete was the maximum when the amount of MEA was 8%.Compression strength of concrete containing MEA-133 was greater than that containing MEA-40 when the content of MEA was the same.Adding MEA in C70 concrete had obvious shrinkage compensating when it was in outdoor exposure.Shrinkage compensating effect of MEA-40 concrete was better than that of MEA- 133 concrete at the same age and the same amount of MEA.The data of 150 days showed, shrinkage compensating effect was preferable when adding with 6% MEA-133 and 4% MEA-40.
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