Self-healing concrete by use of microencapsulated bacterial spores
Self-healing concrete by use of microencapsulated bacterial spores
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DOI：
10.1016/j.cemconres.2013.11.009
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发表时间：
2014-02-01
影响因子：
11.4
通讯作者：
De Belie, N.
中科院分区：
文献类型：
--
作者：
Wang, J. Y.;Soens, H.;De Belie, N.
采用微胶囊技术包裹细菌芽孢，用于自愈合混凝土。首先研究了微胶囊化孢子的存活率以及微胶囊对砂浆试件的影响。通过扫描电子显微镜验证破裂时微胶囊的破裂。通过裂缝愈合率和透水性评价了自愈合能力。结果表明，加有生物微囊的标本愈合率（48%~ 80%）高于不加细菌的标本（18%~ 50%）。细菌系列试样中愈合的最大裂缝宽度为970 μ m，约为非细菌系列（最大250 μ m）的4倍。细菌系列中的整体透水性比非细菌系列中的低约10倍。干湿循环被发现刺激自愈合砂浆标本封装细菌。在95%RH下储存的所有样品中均未观察到自愈合，表明液态水的存在是自愈合的必要组分。(C)2013爱思唯尔有限公司保留所有权利。
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.