Comparing performances of MICP bacterial vegetative cell and microencapsulated bacterial spore methods on concrete crack healing
Comparing performances of MICP bacterial vegetative cell and microencapsulated bacterial spore methods on concrete crack healing
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MICP细菌营养细胞法与微囊化细菌芽孢法修复混凝土裂缝性能的比较
DOI：
10.1016/j.conbuildmat.2021.124227
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发表时间：
2021-07-17
影响因子：
7.4
通讯作者：
Likitlersuang, Suched
中科院分区：
文献类型：
--
作者：
Intarasoontron, Jirapa;Pungrasmi, Wiboonluk;Likitlersuang, Suched
采用细胞/营养液滴加法和固定化法制备微生物诱导碳酸钙沉淀法，比较了生物自愈合混凝土的裂缝愈合性能。用球形芽孢杆菌(LMG-22257)的营养细胞和微囊化细菌孢子修复预裂砂浆。砂浆试件在预裂前养护7天和28天，然后在干湿循环下修复7天。对修复后的裂缝宽度、裂缝面积愈合情况及载荷恢复情况进行比较。结果表明，营养细胞滴注法比固定化微囊化细菌芽孢法修复砂浆更能有效地封闭裂缝，恢复修复后的极限载荷。事实上，混合了微囊化细菌孢子的样品表现出比可比对照样品更低的极限载荷。
This study compares the crack healing performances of biological self-healing concretes using cell/nutrient dropping and immobilization methods to produce microbially induced calcium carbonate precipitation (MICP). Vegetative cells and microencapsulated bacterial spores of Bacillus sphaericus (LMG 22257) were used to heal pre -cracked mortars. Mortar specimens were cured for 7 and 28 days before pre-cracking, and then repaired under wet-dry cycles for 7 days. Comparisons were made in terms of crack-width and crack-area healing and load recovery after repairing. Results showed that the vegetative cell dropping method was more effective in closing cracks and recovering ultimate load after repair than the method of using immobilized microencapsulated bacterial spores for mortar repair. In fact, specimens mixed with microencapsulated bacterial spores exhibited lower ultimate loads than comparable control specimens.