Self-healing concrete by use of microencapsulated bacterial spores

被引：725
作者：
Wang, J. Y. [1 ,2 ]
Soens, H. [3 ]
Verstraete, W. [2 ]
De Belie, N. [1 ]
机构：
[1] Univ Ghent, Fac Engn & Architecture, Magnel Lab Concrete Res, B-9052 Ghent, Belgium
[2] Univ Ghent, Fac Biosci Engn, LabMET, B-9000 Ghent, Belgium
[3] Devan Chem NV, B-9600 Ronse, Belgium
来源：
CEMENT AND CONCRETE RESEARCH | 2014年 / 56卷
关键词：
Crack; Water permeability; Organic materials (microcapsules); Microbial CaCO3; Self-healing; CARBONATE PRECIPITATION; POLYMER; MICROCAPSULES; CEMENTATION; DEPOSITION; LIMESTONE; CALCIUM; GROWTH;
D O I：
10.1016/j.cemconres.2013.11.009
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
Microcapsules were applied to encapsulate bacterial spores for self-healing concrete. The viability of encapsulated spores and the influence of microcapsules on mortar specimens were investigated first. Breakage of the microcapsules upon cracking was verified by Scanning Electron Microscopy. Self-healing capacity was evaluated by crack healing ratio and the water permeability. The results indicated that the healing ratio in the specimens with bio-microcapsules was higher (48%-80%) than in those without bacteria (18%-50%). The maximum crack width healed in the specimens of the bacteria series was 970 mu m, about 4 times that of the non-bacteria series (max 250 mu m). The overall water permeability in the bacteria series was about 10 times lower than that in non-bacteria series. Wet-dry cycles were found to stimulate self-healing in mortar specimens with encapsulated bacteria. No self-healing was observed in all specimens stored at 95%RH, indicating that the presence of liquid water is an essential component for self-healing. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码：139 / 152
页数：14
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