Research on Improving Concrete Durability by Biomineralization Technology

被引:16
作者
Chen, How-Ji [1 ]
Chen, Ming-Cheng [1 ]
Tang, Chao-Wei [2 ,3 ,4 ]
机构
[1] Natl Chung Hsing Univ, Dept Civil Engn, 250 Kuo Kuang Rd, Taichung 40227, Taiwan
[2] Cheng Shiu Univ, Dept Civil Engn & Geomat, 840 Chengching Rd, Kaohsiung 83347, Taiwan
[3] Cheng Shiu Univ, Ctr Environm Toxin & Emerging Contaminant Res, 840 Chengching Rd, Kaohsiung 83347, Taiwan
[4] Cheng Shiu Univ, Super Micro Mass Res & Technol Ctr, 840 Chengching Rd, Kaohsiung 83347, Taiwan
关键词
biomineralization; durability; self-healing concrete; crack repair; MINERALIZATION; PRECIPITATION; PERMEABILITY; REMEDIATION; BACTERIA; MORTAR;
D O I
10.3390/su12031242
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The interfacial transition zone (ITZ) around aggregates in concrete is a weak area with higher porosity than the matrix; it breaks easily under stress and is not conducive to the durability of concrete. However, the ITZ in concrete is full of calcium hydroxide crystals, which can provide the calcium source required for biomineralization. In view of this, this study aims to use the biological activity (i.e., biomineralization technology) existing in nature to enhance the ITZ in concrete and repair concrete cracks to improve the strength and durability of concrete. In this study, the bacterial strain Sporosarcinapasteurii,which is environmentally friendly, was selected. In addition, lightweight aggregate was used as a bacterial carrier. The bacteria were first sporulated. To protect the strains, the biological species were fixed in porous lightweight aggregates. These lightweight aggregates were then used as concrete aggregates. The planned tests included concrete engineering properties (i.e., compressive strength, chloride ion penetration, and water permeability tests) and residual strength after crack repair. The test results show that the use of lightweight aggregate as a carrier and the implantation of Sporosarcinapasteuriican induce biomineralization, strengthen the ITZ, and repair small internal cracks in concrete, thereby improving the strength and durability of the concrete.
引用
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页数:12
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