Stereology- and Morphology-Based Pore Structure Descriptors of Enhanced Porosity (Pervious) Concretes
Stereology- and Morphology-Based Pore Structure Descriptors of Enhanced Porosity (Pervious) Concretes
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DOI：
10.14359/51663143
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发表时间：
2009-09
影响因子：
1.7
通讯作者：
Milani S. Sumanasooriya;N. Neithalath
中科院分区：
文献类型：
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作者：
Milani S. Sumanasooriya;N. Neithalath
在增强孔隙率混凝土（EPC）（或透水混凝土）和其他大孔材料的结构和功能性能中，孔隙率、孔径及其分布、连通性、比表面积和其他孔结构特征起着主导作用。本文利用数学形态学和体视学技术对此类 EPC 特征进行分析。基于两点相关的形态学方法和基于面积和线分数的体视学方法提供了所研究的混合物的相似孔隙率值。与混合骨料混合物相比，单一尺寸骨料 EPC 混合物的孔隙率更低。发现较小的孔径是由混合物中较高比例的较小尺寸聚集体造成的。有效孔径的定义基于基于开口粒度密度函数的临界尺寸、基于特征尺寸的两点相关性以及当量直径的孔径分布。共混骨料混合物的孔径位于由单一尺寸骨料构成共混物的混合物的孔径之间。孔比表面积的倒数与有效孔径和相关长度之间存在良好的对应关系，而孔之间的平均自由间距与这些量之间存在线性关系。比较了基于体视学的表示预连通性的三维孔隙分布密度和渗透率的水力连通性因子，发现后者是一个更敏感的参数，通过它可以区分不同尺寸骨料制成的EPC试件。
In the structural and functional performance of enhanced porosity concrete (EPC) (or pervious concrete) and other macroporous materials, porosity, pore sizes and their distribution, connectivity, and specific surface area and other pore structure features play dominant roles. Analysis of such EPC features is dealt with in this paper using mathematical morphology and stereological techniques. Similar porosity values for the studied mixtures were provided by a morphological method based on two-point correlation and stereological methods based on area and line fractions. Lower porosity was shown by single-sized aggregate EPC mixtures than blended aggregate mixtures. Smaller pore sizes are found to result from higher proportions of smaller sized aggregates in the mixture. There is definition of an effective pore diameter based on a critical size based on opening granulometric density function, a two-point correlation based characteristic size, and pore size distribution of equivalent diameters. The pore sizes of the blended aggregate mixtures lie in between those of mixtures in which single-sized aggregates make up the blend. Good correspondence is seen between the inverse of the specific surface areas of pores and the effective pore diameter and correlation lengths, whereas there is linear relation of the mean free spacing between pores and these quantities. There is comparison of stereology-based three-dimensional pore distribution density indicating preconnectivity and a hydraulic connectivity factor for permeability, and the latter is shown to be a more sensitive parameter through which EPC specimens made with different size aggregates can be distinguished.