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Preparation of MgO- and CaO-bearing Expansive Agent Used for Cement-Based Materials

机译：用于水泥基材料的含MgO和CaO的膨胀剂的制备

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摘要

Blended expansive agents consisting of MgO and CaO were prepared by calcining the mixtures of dolomite and magnesite. The mineral phases and microstructures of expansive agent were examined by XRD and SEM. The expansion properties of cement pastes containing 5% and 6% of expansive agent as well as the microstructure of hydrated expansive agent in cement paste were investigated. Results indicated that the contents of MgO and CaO in the blended expansive agent could be adjusted by changing the mix proportion of dolomite and magnesite. All the cement pastes containing expansive agent produced rapid expansion. At the same addition dosage, irrespective of curing temperature, expansive agent containing higher content of MgO produced greater expansion in cement pastes, particularly at late age, which probably ascribes to the relatively slow hydration of MgO.
机译：通过煅烧白云石和菱镁矿的混合物来制备由MgO和CaO组成的混合膨胀剂。用XRD和SEM观察了膨胀剂的矿物相和微观结构。研究了含5％和6％膨胀剂的水泥浆的膨胀性能，以及水合膨胀剂在水泥浆中的微观结构。结果表明，可以通过改变白云石和菱镁矿的混合比例来调节混合膨胀剂中MgO和CaO的含量。所有包含膨胀剂的水泥浆均产生快速膨胀。在相同的添加量下，无论固化温度如何，含有较高含量的MgO的膨胀剂在水泥浆中都会产生更大的膨胀，尤其是在较晚时，这可能归因于MgO的相对缓慢的水合作用。

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  • 来源
  • 会议地点 Shanghai(CN)
  • 作者

    Mo Liwu; Deng Yang; Lu Anqun; Deng Min;

  • 作者单位

    College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, China;

    College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, China;

    College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, China;

    College of Materials Science and Engineering, Nanjing University of Technology, Nanjing 210009, China;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Expansive agent; MgO; CaO;

    机译：膨胀剂；氧化镁;氧化钙;

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