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Influence of physico-chemical characteristics on the carbonation of cement paste at high replacement rates of metakaolin

机译：高偏高岭土置换率下理化特性对水泥浆碳化的影响

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摘要

The study detailed in this paper examined the influence of two types of metakaolin (MK1 and MK2) at high replacement rates on the carbonation rate of cement paste. "Flash" calcination produced MK1, which had a high amount of quartz mixed in, while "fluidized bed" calcination produced MK2, which was relatively pure. The metakaolins were incorporated into the cement paste at rates of up to 50% by weight of cement and cured for 90 days. With regard to durability, MK replacement increased water porosity and susceptibility to carbonation, while water adsorption and primary sorptivity decreased. Thermogravimetric analysis (TGA) and X-ray Diffraction (XRD) analysis of the hydration phases showed a decrease in portlandite (Ca(OH)(2)) content with MK replacement, increasing carbonation susceptibility. Decreased portlandite showed a strong correlation with an increased carbonation rate, indicating that these are primary factors in metakaolin cement paste carbonation. With TGA deconvolution, MK1 significantly increased CSH content up to a replacement level of 20%, while replacement levels over 30% appeared to reduce CSH formation. MK2 replacement did not have as significant an effect on CSH formation, corresponding with the higher primary sorptivity and greater susceptibilitylo carbonation penetration of MK2. (C) 2017 Elsevier Ltd. All rights reserved.
机译：本文详细研究了在高置换率下两种偏高岭土（MK1和MK2）对水泥浆碳化速度的影响。 “闪蒸”煅烧产生MK1，其中混入了大量的石英，而“流化床”煅烧产生MK2，其相对纯。将偏高岭土以最高占水泥重量的50％的比例掺入水泥浆中，并固化90天。关于耐久性，MK替代增加了水的孔隙率和碳酸化敏感性，而水的吸附和主要的吸附性降低了。水合相的热重分析（TGA）和X射线衍射（XRD）分析显示，随着MK的置换，硅酸盐（Ca（OH）（2））含量降低，增加了碳酸化敏感性。减少的波特兰石与增加的碳酸化速率显示出很强的相关性，表明这些是偏高岭土水泥浆碳化的主要因素。通过TGA解卷积，MK1显着提高了CSH含量，直至替代水平为20％，而替代水平超过30％似乎减少了CSH的形成。 MK2的置换对CSH的形成没有显着影响，这与MK2的较高的一级吸附性和较高的碳酸化渗透度相对应。 （C）2017 Elsevier Ltd.保留所有权利。

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  • 来源
    《Construction and Building Materials》 |2018年第15期|164-172|共9页
  • 作者

    Mikhailenko Peter; Cassagnabere Franck; Emam Aly; Lachemi Mohamed;

  • 作者单位

    Univ Waterloo, Dept Civil & Environm Engn, Ctr Pavement & Transportat Technol, 200 Univ Ave W, Waterloo, ON N2L 3G1, Canada|Univ Paul Sabatier Toulouse III, LMDC, 155 Ave Rangueil, F-31400 Toulouse, France|Ryerson Univ, Dept Civil Engn, 350 Victoria St, Toronto, ON M5B 2K3, Canada;

    Univ Paul Sabatier Toulouse III, LMDC, 155 Ave Rangueil, F-31400 Toulouse, France;

    Ryerson Univ, Dept Civil Engn, 350 Victoria St, Toronto, ON M5B 2K3, Canada;

    Ryerson Univ, Dept Civil Engn, 350 Victoria St, Toronto, ON M5B 2K3, Canada;

  • 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

    Cement paste; Metakaolin; Durability; Cement hydration; Carbonation;

    机译：水泥浆;金属高岭土;耐久性;水泥水化;碳化;

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