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Effect of ternary cements containing thermally activated paper sludge and fly ash on the texture of C-S-H gel

机译:含热活化纸浆和粉煤灰的三元水泥对C-S-H凝胶质地的影响

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摘要

The texture of the C-S-H gels formed in ternary cement blends containing thermally activated paper sludge (APS), fly ash (FA) from coal combustion and Ordinary Portland Cement (OPC) was studied by means of the specific surface area (SSA) and pore-size distribution (PSD), which were measured by the sorption isotherms of nitrogen gas and the BET method. Two differentiated zones in the PSD of the C-S-H gel at ~10-20 nm and ~5 nm were observed. The proportion of such zones depends on the age of hydration and amount of OPC replacement. The incorporation of the additions (APS and FA) clearly revealed an increase in both porosity and SSA. This effect decreased with the progress of hydration together with a refinement of the nano-porous structure of C-S-H. High correlations were found among these nanostructure characteristics of the C-S-H gel and mechanical strengths.
机译:通过比表面积(SSA)和孔隙率研究了三元水泥共混物中形成的CSH凝胶的质地,该三元水泥共混物包含热活化纸污泥(APS),燃煤飞灰(FA)和普通硅酸盐水泥(OPC)。粒度分布(PSD),这是通过氮气的吸附等温线和BET方法测得的。在C-S-H凝胶的PSD中,在〜10-20 nm和〜5 nm处观察到两个不同的区域。这些区域的比例取决于水合年龄和OPC替换量。添加剂(APS和FA)的掺入清楚地表明孔隙率和SSA均增加。随着水合作用以及C-S-H纳米孔结构的细化,该作用降低。在C-S-H凝胶的这些纳米结构特征与机械强度之间发现高度相关。

著录项

  • 来源
    《Construction and Building Materials》 |2012年第2012期|p.381-388|共8页
  • 作者单位

    Institute de Gencias de fa Construction Eduardo Torroja (IETcc-CSIC), C/Serrano Galvache, 4, 28033 Madrid, Spain;

    Institute de Gencias de fa Construction Eduardo Torroja (IETcc-CSIC), C/Serrano Galvache, 4, 28033 Madrid, Spain;

    Tecnalia, NANOC, Unidad Asoaada CSIC-TECNALIA Parque Tecnologico de Bizkaia, C/Celdo, 48160 Derio, Spain;

    Dpto. de Geologia y Ceoquimica, Unidad Asoaada CSIC-UAM, Universidad Autonoma de Madrid, 28049 Madrid, Spain;

    Dpto. de Geologia y Ceoquimica, Unidad Asoaada CSIC-UAM, Universidad Autonoma de Madrid, 28049 Madrid, Spain;

  • 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

    blended cement; hydration; calcium-silicate-hydrate (C-S-H); surface area; compressive strength;

    机译:混合水泥保湿水合硅酸钙(C-S-H);表面积;抗压强度;

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