水泥中MgO膨胀剂水化产生的膨胀应力表征

发布时间：2018-02-22 19:35

  本文关键词： MgO膨胀剂 膨胀应力 水化程度 约束条件　出处：《材料科学与工程学报》2017年04期 　论文类型：期刊论文

【摘要】：本文研制了一套膨胀应力测试装置,并以此为基础测试了约束条件下MgO膨胀剂(MEA)压实体和掺MgO膨胀剂水泥浆体中水化产生的膨胀应力;采用X射线衍射法定量分析了MgO的含量,并计算MgO的水化程度。结果表明:活性指数为23s和46s的MgO膨胀剂压实体水化22d产生的膨胀应力分别为38.9MPa和62.7MPa;掺水泥浆体的膨胀应力随MEA掺量增大、MEA活性指数提高和MgO水化程度增加而增大,不掺MgO膨胀剂的水泥浆体63d时的收缩应力为1.3MPa,掺12%活性指数为23s和46s的MgO膨胀剂水泥浆体在63d时的膨胀应力分别为1.8MPa和3.0MPa。
[Abstract]:In this paper, a set of apparatus for measuring expansion stress has been developed, based on which the expansion stress produced by hydration of MgO expander and MgO expansive agent cement paste has been measured under constraint conditions, and the content of MgO has been quantitatively analyzed by X-ray diffraction. The hydration degree of MgO was calculated. The results showed that the expansion stress of MgO expansive agent with active index of 23s and 46s was 38.9 MPA and 62.7 MPa for 22 days, respectively, and the expansion stress of cement paste increased with the increase of MEA content. And the degree of hydration of MgO increased, The shrinkage stress of cement paste without MgO expansive agent was 1.3 MPA at 63 d, and the expansion stress of cement paste with 12% activity index of 23 s and 46 s was 1.8 MPA and 3.0 MPA at 63 d, respectively.
【作者单位】： 国家"江苏先进生物与化学制造协同创新中心";材料化学工程国家重点实验室南京工业大学材料科学与工程学院;
【分类号】：TU528

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