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首页> 外文期刊>Construction and Building Materials >Mechanical and hydration properties of ground granulated blastfurnace slag pastes activated with MgO-CaO mixtures
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Mechanical and hydration properties of ground granulated blastfurnace slag pastes activated with MgO-CaO mixtures

机译：用MgO-CaO混合物活化的高炉矿渣矿渣糊的机械和水合特性

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摘要

Since alkali-activated slag using conventional activators suffers from economical and technical problems, other alternative activators should be explored. This paper reports the results of an investigation into the activation of ground granulated blastfurnace slag by using 10% (by weight) reactive MgO, CaO and their mixtures with various ratios. The mechanical and hydration properties of pastes were examined up to 90 days. It was found that the strength of slag pastes activated with MgO-CaO mixtures decreased with the increasing ratio of MgO to CaO in the early age while a much steeper strength gain was observed in pastes with MgO/CaO higher than 19/1 after 28 days and longer. The addition of small amount of CaO in MgO can greatly accelerate the hydration of slag in the early age by increasing the pH of pore solution. However, pastes showed small difference in strength development at each period when MgO/CaO was less than 1. The main hydration products, analysed by XRD, TGA and SEM/EDS, were C-S-H and hydrotalcite-like phases. While CaO accelerated the formation of C-S-H in the early age, MgO induced more amount of hydrotalcite-like phases, which notably enhanced the strength of slag pastes with high MgO content after 28 days and longer. Calcite, portlandite and residual MgO were also observed, depending on the MgO/CaO ratio and the hydration time. This work indicated that the replacement of MgO by CaO can make the application of reactive MgO in slag activation more economical.
机译：由于使用常规活化剂的碱活化炉渣存在经济和技术问题，因此应探索其他替代活化剂。本文报告了通过使用10％（按重量计）的反应性MgO，CaO及其各种比例的混合物活化磨碎的高炉矿渣的研究结果。在长达90天的时间内检查了糊的机械和水合性能。发现在早期，MgO-CaO混合物活化的矿渣浆的强度随MgO与CaO的比例的增加而降低，而在28天后观察到的MgO / CaO高于19/1的矿浆的强度增加更陡和更长的时间。在MgO中添加少量CaO可以通过增加孔溶液的pH值来极大地促进早期的矿渣水化。但是，当MgO / CaO小于1时，糊剂在每个时期的强度发展均显示出很小的差异。通过XRD，TGA和SEM / EDS分析的主要水合产物为C-S-H和类水滑石相。尽管CaO在早期促进了C-S-H的形成，但MgO诱导了更多的水滑石状相，这显着提高了28天或更长时间后具有高MgO含量的矿渣浆的强度。根据MgO / CaO的比例和水合时间，也观察到方解石，钙钛矿和残留的MgO。这项工作表明用CaO代替MgO可以使活性MgO在炉渣活化中的应用更加经济。

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  • 来源
    《Construction and Building Materials》 |2014年第30期|101-108|共8页
  • 作者

    Kai Gu; Fei Jin; Abir Al-Tabbaa; Bin Shi; Jin Liu;

  • 作者单位

    School of Earth Sciences and Engineering, Nanjing University, 163 Xianlin Avenue, Nanjing 210023, China,Department of Engineering, University of Cambridge, Trumpington Road, Cambridge CB2 1PZ, UK;

    Department of Engineering, University of Cambridge, Trumpington Road, Cambridge CB2 1PZ, UK;

    Department of Engineering, University of Cambridge, Trumpington Road, Cambridge CB2 1PZ, UK;

    School of Earth Sciences and Engineering, Nanjing University, 163 Xianlin Avenue, Nanjing 210023, China;

    School of Earth Sciences and Engineering, Hohai University, 1 Xikang Road, Nanjing 210098, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Alkali-activated slag; Reactive MgO; CaO; Hydration;

    机译：碱活化炉渣;反应性MgO;氧化钙;补水;

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