Application potential of Bacillus megaterium encapsulated by low alkaline sulphoaluminate cement in self-healing concrete
Application potential of Bacillus megaterium encapsulated by low alkaline sulphoaluminate cement in self-healing concrete
复制标题
低碱性硫铝酸盐水泥包裹巨大芽孢杆菌在自修复混凝土中的应用潜力
DOI：
10.1016/j.conbuildmat.2020.121740
复制
发表时间：
2020-12
影响因子：
7.4
通讯作者：
Chunxiang Qian
中科院分区：
文献类型：
--
作者：
Yilin Su;Tianwen Zheng;Chunxiang Qian
微生物自修复混凝土是利用微生物矿化作用加速碳酸盐沉积的一种环保型混凝土技术。与此同时，如何将微生物和营养物质进行合理的组合，减少对混凝土本身性能的负面影响，也成为该技术的瓶颈。本研究采用挤压法将巨大芽孢杆菌芽孢、营养物质和低碱性载体组装成一个整体。采用低碱硫铝酸钙水泥作为载体，保护孢子免受水泥水化引起的高碱度环境的影响。在研究了这种组装方法对芽孢的保护作用后，将这种一体化自修复剂应用于混凝土中，通过面积修复率、水阻恢复率、氯离子阻恢复率和愈合深度来评价裂缝的修复效果。同时，采用XRD和SEM结合EDS对修复产物进行了分析。此外，两种不同的营养物质被用作微生物矿化的前体，它们的负面影响也进行了研究。结果表明，巨大芽孢杆菌可以利用葡萄糖和乳酸钙作为前体，这种新的修复体系显著提高了自修复效率。与葡萄糖相比，乳酸钙作为前体时具有更好的修复效果，平均愈合深度达到4000 µm。同时，CSA水泥是一种优良的芽孢载体，将微生物和营养物质与CSA水泥复合后，可降低营养物质对混凝土的负面影响。
With the help of microbial mineralization to accelerate carbonate deposition, microbial self-healing concrete has developed into a promising technology because it is environmentally friendly. At the same time, how to assemble properly microorganisms and nutrients to reduce the negative impact on the performance of concrete itself has become a bottleneck of this technology. In this research, microbial spores ofBacillus megaterium, nutrients and low-alkaline carriers were assembled as a whole by extrusion. Low alkali calcium sulphoaluminate (CSA) cement was used as the carrier to protect spores from the high alkalinity environment caused by cement hydration. After studying the protective effect of this assembly method on spores, this integrated self-healing agent was applied in concrete, and then repairing efficiency of cracks was evaluated by area repairing ratio, recovery of water resistance, recovery of resistance to chloride ions and healing depth. Meanwhile, the repairing products were analyzed by XRD and SEM equipped with an EDS. Moreover, two different nutrients were used as precursors for microbial mineralization, and their negative effects have also been studied. The results showed thatBacillus megateriumcould use glucose and calcium lactate as the precursors, and this new repairing system significantly improves the efficiency of self-healing. Compared to glucose, calcium lactate has a better repair effect when used as a precursor, and the average healing depth reached 4000 µm. At the same time, CSA cement was an excellent carrier for spores and could reduce the negative impact of nutrients on concrete when microorganisms and nutrients were assembled with CSA cement.
登录
查看更多内容
影响因子：
5
作者：
Xuejiao Zhu;Jianyun Wang;N. De Belie;N. Boon
通讯作者：
Xuejiao Zhu;Jianyun Wang;N. De Belie;N. Boon
影响因子：
10.5
作者：
Jianyun Wang;J. Dewanckele;V. Cnudde;S. Vlierberghe;W. Verstraete;N. Belie
通讯作者：
Jianyun Wang;J. Dewanckele;V. Cnudde;S. Vlierberghe;W. Verstraete;N. Belie
影响因子：
11.4
作者：
Wang, J. Y.;Soens, H.;De Belie, N.
通讯作者：
De Belie, N.
影响因子：
10.5
作者：
Jianyun Wang;A. Mignon;Gilles Trenson;S. Vlierberghe;N. Boon;N. Belie
通讯作者：
Jianyun Wang;A. Mignon;Gilles Trenson;S. Vlierberghe;N. Boon;N. Belie
DOI：
10.1023/a:1015135629155
发表时间：
2002-01-01
期刊：
Re/Views in Environmental Science and Bio/Technology
影响因子：
--
作者：
Hammes, Frederik;Verstraete, Willy
通讯作者：
Verstraete, Willy