Journal
CEMENT AND CONCRETE RESEARCH
Volume 56, Issue -, Pages 139-152Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2013.11.009
Keywords
Crack; Water permeability; Organic materials (microcapsules); Microbial CaCO3; Self-healing
Funding
- Research Foundation Flanders (FWO-Vlaanderen) [G.0157.08]
- Ghent University
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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.
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