| 水泥中MgO膨胀剂水化产生的膨胀应力表征 |
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| 引用本文： | 刘猛,邓敏,莫立武. 水泥中MgO膨胀剂水化产生的膨胀应力表征[J]. 材料科学与工程学报, 2017, 35(4). DOI: 10.14136/j.cnki.issn 1673-2812.2017.04.022 |
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| 作者姓名： | 刘猛 邓敏 莫立武 |
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| 作者单位： | 1. 国家“江苏先进生物与化学制造协同创新中心”,江苏南京,210009;2. 国家“江苏先进生物与化学制造协同创新中心”,江苏南京210009;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,江苏南京210009 |
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| 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。
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| 关 键 词： | MgO膨胀剂 膨胀应力 水化程度 约束条件 |
Expansive Stress Generated by Hydration of Mgo Expansive Agents in Cement |
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| LIU Meng,DENG Min,MO Liwu. Expansive Stress Generated by Hydration of Mgo Expansive Agents in Cement[J]. Journal of Materials Science and Engineering, 2017, 35(4). DOI: 10.14136/j.cnki.issn 1673-2812.2017.04.022 |
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| Authors: | LIU Meng DENG Min MO Liwu |
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| Abstract: | An experimental device was designed to measure the expansive stress of compacted MEA and that of cement pastes containing MEA under restraint condition.The content of periclase was analyzed by Xray diffraction and the hydration degree of periclase was calculated.Results indicated that the expansive stress of the compacted MEA-23 and MEA-46 hydrated for 22d were 38.9MPa and 62.7MPa,respectively.The expansive stresses of cement pastes containing MEA increased with the increasing content of MEA,the activity index of MEA and the hydration degree of periclase.The shrinkage stress of cement pastes without MEA cured for 63d was 1.3MPa,the expansive stress of cement pastes containing 12％ MEA-23 and MEA-46 cured for 63d were 1.8MPa and 3.0MPa,respectively. |
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| Keywords: | MgO expansive agent expansive stress hydration degree restraint condition |
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