3D porosity distribution of partly calcium leached cement paste

被引：34

作者：

Wan, Keshu ^{[1
,2
]}

Xu, Qiong ^{[2
]}

Li, Lin ^{[2
]}

Sun, Wei ^{[1
,2
]}

机构：

[1] Jiangsu Key Lab Construct Mat, Nanjing 211189, Jiangsu, Peoples R China

[2] Southeast Univ, Sch Mat Sci & Engn, Nanjing 211189, Jiangsu, Peoples R China

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2013年 / 48卷

基金：

中国国家自然科学基金;

关键词：

Calcium leaching; Cement paste; Porosity; Tomography; TOMOGRAPHY; ENVIRONMENTS; CONCRETE; STRENGTH; MODEL;

D O I：

10.1016/j.conbuildmat.2013.06.073

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Calcium leaching of cement-based materials is one of durability concerns in concrete structures. Calcium leaching leads to high porosity and porosity gradient near the wet surfaces of cement-based materials. In this research, the 3D porosity distributions of partly leached cement pastes with different water-to-cement ratios are characterized for the first time, and the porosity evolution caused by calcium leaching are discussed. The results are verified using the average porosities of the partly leached specimen. From the quantitative porosity results, large porosities over 60% are observed on the leached parts, and very sharp porosity gradients are observed on the leaching fronts. The results of current research can be used for the verification of calcium leaching models and for understanding the leaching mechanism. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：11 / 15

页数：5

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