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The Effect of Fly Ash on TSA of Cementitous Material: Based on Three Years Results

机译：粉煤灰对胶凝材料TSA的影响：基于三年的结果

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摘要

The thaumasite form of sulfate attack of cementitous material (TSA) is a new kind of sulfate attack and it is more harmful than traditional sulfate attack. By means of Fourier transform infrared (FT-IR) and X-ray diffraction (XRD), the effect of dosage and fineness of fly ash on TSA of cementitous material were investigated in this paper. The specimens had been immersed in magnesium sulfate solution of 5% mass concentration at 5+-2℃ for three years. The results showed that fly ash could not restrain the formation of thaumasite but it delayed the occurrence of TSA in cementitous material when 30% fly ash takes place of cement. Fly ash could enhance the resistance of cementitous material to TSA through secondary hydration reaction to optimizing the pore structure of hardened cement paste and lowering the C/S of C-S-H gel.
机译：胶质材料（TSA）硫酸盐侵蚀的硫磺铝石形式是一种新型的硫酸盐侵蚀，它比传统的硫酸盐侵蚀更具危害性。通过傅立叶变换红外光谱（FT-IR）和X射线衍射（XRD），研究了粉煤灰的掺量和细度对胶凝材料TSA的影响。将样品在5 + -2℃的质量浓度为5％的硫酸镁溶液中浸泡3年。结果表明，当30％的粉煤灰代替水泥时，粉煤灰不能抑制硅藻土的形成，但会延缓胶凝材料中TSA的产生。粉煤灰可通过二次水合反应增强胶凝材料对TSA的抵抗力，从而优化硬化水泥浆的孔结构并降低C-S-H凝胶的C / S。

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  • 来源
  • 会议地点 Shanghai(CN)
  • 作者

    Benwan Liu; Changhui Yang; Xiaobin Xang; Linwen Yu; Jing Zhang;

  • 作者单位

    College of Materials Science and Technology, Chongqing University, Chongqing 400045, China;

    College of Materials Science and Technology, Chongqing University, Chongqing 400045, China;

    College of Materials Science and Technology, Chongqing University, Chongqing 400045, China;

    College of Materials Science and Technology, Chongqing University, Chongqing 400045, China;

    Zheng Yuan Engineering Quality Detection Limited Company, Chongqing 400023, China;

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

    Fly ash; TSA; Cement-based materialrn.;

    机译：粉煤灰； TSA；水泥基材料。;

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