Acoustic emission analysis for the quantification of autonomous crack healing in concrete

被引：123
作者：
Van Tittelboom, Kim [1 ]
De Belie, Nele [1 ]
Lehmann, Frank [2 ]
Grosse, Christian U. [3 ]
机构：
[1] Univ Ghent, Dept Struct Engn, Magnel Lab Concrete Res, B-9052 Ghent, Belgium
[2] Univ Stuttgart, Mat Testing Inst, Dept Nondestruct Testing & Monitoring Tech, D-70550 Stuttgart, Germany
[3] Tech Univ Munich, Ctr Bldg Mat, Nondestruct Testing Lab, D-81245 Munich, Germany
来源：
CONSTRUCTION AND BUILDING MATERIALS | 2012年 / 28卷 / 01期
关键词：
Self-healing concrete; Ceramic tubes; Polymers; Mechanical properties; Non-destructive testing; PERMEABILITY; ULTRASOUND;
D O I：
10.1016/j.conbuildmat.2011.08.079
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
As half of the annual construction budget is spent on remediation of existing structures, self-healing of concrete, which is very sensitive to cracking, would be highly desirable. In this research, encapsulated healing agents were embedded in the concrete matrix in order to obtain self-healing properties. Upon cracking, the capsules break and the healing agent is released, resulting in crack repair. The efficiency of this crack healing technique was evaluated by means of mechanical tests and by using acoustic emission analysis. It was shown that due to autonomous crack repair, more than 80% of the original strength and stiffness can be regained. Events with an energy higher than the energy related to concrete cracking indicated breakage of the capsules. Upon reloading of beams with untreated cracks, the released energy was lower compared to beams with healed cracks. From this study it was shown that AE is a suitable technique to evaluate self-healing of cracks in concrete. (C) 2011 Elsevier Ltd. All rights reserved.
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页码：333 / 341
页数：9
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