3D spatial distribution of the calcium carbonate caused by carbonation of cement paste

被引：53
|
作者：
Wan, Keshu [1 ,2 ]
Xu, Qiong [2 ]
Wang, Yudong [2 ]
Pan, Ganghua [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：
CEMENT & CONCRETE COMPOSITES | 2014年 / 45卷
基金：
中国国家自然科学基金;
关键词：
Cement-based materials; Carbonation; Calcium carbonate; Tomography; RAY COMPUTED-TOMOGRAPHY; DEPTH PROFILES; PORE STRUCTURE; CONCRETE; MICROSTRUCTURE; TRANSPORT; MICROTOMOGRAPHY; MOISTURE; HEAT;
D O I：
10.1016/j.cemconcomp.2013.10.011
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Carbonation of cement-based materials is one area of concern for the durability of concrete structures. The calcium carbonate caused by carbonation is an important indicator of carbonation degrees. The present paper, using 3D tomography data, proposes a nondestructive method to characterize the 3D spatial distributions of calcium carbonate. It allows monitoring of 3D carbonation evolutions. The evolution of the calcium carbonate distributions in a specimen of cement paste with different carbonation degrees is given using the current method. The results are compared with the average quantity of calcium carbonate determined by thermal analysis. From the sharp edge of the calcium carbonate distribution, we conclude that the accelerated carbonation in this experimental condition is a diffusion controlling process. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：255 / 263
页数：9
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