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首页> 外文期刊>Applied Surface Science >Surface fractal analysis of pore structure of high-volume fly-ash cement pastes
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Surface fractal analysis of pore structure of high-volume fly-ash cement pastes

机译：大体积粉煤灰水泥浆孔结构的表面分形分析

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摘要

The surface fractal dimensions of high-volume fly-ash cement pastes are evaluated for their hardening processes on the basis of mercury intrusion porosimetry (MIP) data. Two surface fractal models are retained: Neimark's model with cylindrical pore hypothesis and Zhang's model without pore geometry assumption. From both models, the logarithm plots exhibit the scale-dependent fractal properties and three distinct fractal regions (I, II, III) are identified for the pore structures. For regions I and III, corresponding to the large (capillary) and small (C-S-H inter-granular) pore ranges respectively, the pore structure shows strong fractal property and the fractal dimensions are evaluated as 2.592-2.965 by Neimark's model and 2.487-2.695 by Zhang's model. The fractal dimension of region I increases with w/b ratio and hardening age but decreases with fly-ash content by its physical filling effect; the fractal dimension of region III does not evolve much with these factors. The region II of pore size range, corresponding to small capillary pores, turns out to be a transition region and show no clear fractal properties. The range of this region is much influenced by fly-ash content in the pastes. Finally, the correlation between the obtained fractal dimensions and pore structure evolution is discussed in depth.
机译：根据汞侵入孔隙率法（MIP）数据，评估了高容量粉煤灰水泥浆的表面分形维数，以了解其硬化过程。保留了两个表面分形模型：带有圆柱孔假设的Neimark模型和没有孔几何假设的Zhang模型。从这两个模型，对数图均显示出与尺度相关的分形特性，并为孔结构确定了三个不同的分形区域（I，II，III）。对于区域I和III，分别对应于大（毛细血管）和小（CSH颗粒间）孔隙范围，孔隙结构显示出很强的分形特性，分形维数根据Neimark模型评估为2.592-2.965，而对于2.487-2.695张的模型。 I区的分形维数随w / b比和硬化年龄的增加而增加，但由于其物理填充效应而随粉煤灰含量的减小而减小。在这些因素的作用下，区域III的分形维数变化不大。对应于小的毛细孔的孔径范围的区域II变成过渡区域，并且没有清晰的分形特性。该区域的范围受浆料中飞灰含量的影响很大。最后，深入讨论了分形维数与孔隙结构演化之间的相关性。

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  • 来源
    《Applied Surface Science》 |2010年第3期|p.762-768|共7页
  • 作者

    Oiang Zeng; Kefei Li; Teddy Fen-Chong; Patrick Dangla;

  • 作者单位

    Civil Engineering Department, Tsinghua University, Beijing 100084, PR China,Universite Paris-Est, Laboratoire Navier, Ecole des Fonts ParisTech, LCPC, UMR CNRS, Champs-sur-Marne 77420, France;

    Civil Engineering Department, Tsinghua University, Beijing 100084, PR China;

    Universite Paris-Est, Laboratoire Navier, Ecole des Fonts ParisTech, LCPC, UMR CNRS, Champs-sur-Marne 77420, France;

    Universite Paris-Est, Laboratoire Navier, Ecole des Fonts ParisTech, LCPC, UMR CNRS, Champs-sur-Marne 77420, France;

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  • 正文语种 eng
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  • 关键词

    fractal dimension; fly-ash; mercury intrusion porosimetry; pore structure;

    机译：分形维数粉煤灰压汞法孔结构;

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