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The pore structure and permeability of alkali activated fly ash

机译：碱活化粉煤灰的孔结构和渗透性

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摘要

This study correlates the pore structure and water permeability of paste made of alkali activated fly ash (AAF) with varying silica and alkali content, curing age and curing temperature. The pore structure of AAF paste was examined by mercury intrusion porosimetry (MIP) and environmental scanning electron microscopy (ESEM), and compared with the pore structure of Portland cement paste. The results reveal that the pore structure of AAF paste with high silica content significantly differs from that of cement paste, resulting in different water permeability. For equal reaction age, the permeability of AAF paste was higher than that of cement paste with w/c = 0.4, an effect (that was) especially pronounced at later ages. However, a longer curing time at elevated temperature could significantly decreased the water permeability of AAF paste. MIP results show a consistent relationship between water permeability and total porosity, effective porosity and pore threshold diameter, respectively. Furthermore, a modified model incorporating all hereby experimentally derived parameters, is proposed to predict the water permeability of AAF.
机译：这项研究将碱活化粉煤灰（AAF）制成的糊的孔结构和透水性与二氧化硅和碱含量，固化年龄和固化温度的变化联系起来。通过压汞法（MIP）和环境扫描电子显微镜（ESEM）检查了AAF浆的孔结构，并与硅酸盐水泥浆的孔结构进行了比较。结果表明，二氧化硅含量高的AAF浆料的孔结构与水泥浆明显不同，从而导致不同的透水性。在相等的反应年龄下，w / c = 0.4时，AAF浆的渗透性高于水泥浆，这在后来的年龄中尤为明显。但是，在高温下较长的固化时间会显着降低AAF糊的透水性。 MIP结果分别显示出水渗透率与总孔隙率，有效孔隙率和孔隙阈值直径之间具有一致的关系。此外，提出了一种结合了所有由此通过实验得出的参数的改进模型来预测AAF的水渗透性。

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  • 来源
    《Fuel》 |2013年第2期|771-780|共10页
  • 作者

    Y. Ma; J. Hu; G. Ye;

  • 作者单位

    Delft University of Technology, Faculty of Civil Engineering and Geosciences, Department of Materials and Environment, Delft, The Netherlands,Delft University of Technology, CiTG, Department of Materials and Environment, Stevinweg 1, 2628CN Delft, The Netherlands;

    Delft University of Technology, Faculty of Civil Engineering and Geosciences, Department of Materials and Environment, Delft, The Netherlands;

    Delft University of Technology, Faculty of Civil Engineering and Geosciences, Department of Materials and Environment, Delft, The Netherlands,Ghent University, Department of Structural Engineering, Ghent, Belgium;

  • 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 fly ash; geopolymer; pore structure; MIP; water permeability;

    机译：碱活化粉煤灰;地质聚合物孔结构MIP;透水性;

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