Entropy evolution during crack propagation in concrete under sulfate attack

被引：20
作者：
Yao, Jinwei [1 ,3 ]
Chen, Jiankang [1 ]
Lu, Chunsheng [2 ]
机构：
[1] Ningbo Univ, Fac Mech Engn & Mech, Ningbo 315211, Zhejiang, Peoples R China
[2] Curtin Univ, Sch Civil & Mech Engn, Perth, WA 6845, Australia
[3] Zhejiang Business Technol Inst, Ningbo 315012, Zhejiang, Peoples R China
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2019年 / 209卷
基金：
中国国家自然科学基金;
关键词：
Concrete; Sulfate attack; Surface cracks; Information entropy; Damage evolution; DAMAGE; EXPANSION; MECHANISM; MORTARS; MODEL;
D O I：
10.1016/j.conbuildmat.2019.03.083
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
In this paper, the corrosion experiment of concrete showed that the length and orientation of cracks, as well as their propagation direction are randomly distributed. By virtue of SEM and XRD techniques, the growth of delayed ettringite was detected, which leads to expansion stress and then induces the nucleation and propagation of cracks. To investigate the statistical characteristics of cracks, the concept of information entropy was adopted. Furthermore, based on the entropy evolution at different corrosion times and the chemical reaction rate of delayed ettringite, a model for entropy evolution was proposed. It is shown that the normalized entropy exponentially increases with the non-dimensional corrosion time. (C) 2019 Elsevier Ltd. All rights reserved.
引用
收藏
页码：492 / 498
页数：7
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