Remediation of Concrete Using Micro-Organisms
Remediation of Concrete Using Micro-Organisms
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DOI：
10.14359/10154
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发表时间：
2001
影响因子：
1.7
通讯作者：
S. Ramachandran;V. Ramakrishnan;S. Bang
中科院分区：
文献类型：
--
作者：
S. Ramachandran;V. Ramakrishnan;S. Bang
本文介绍了一种创新的生物技术--利用微生物诱导矿物沉淀进行混凝土修复。研究了巴氏芽孢杆菌在两种硅酸盐水泥砂浆(PCM)中诱导方解石析出的情况：一种是由微生物混合制备的，另一种是填充微生物混合物的模拟裂缝。研究结果表明，含有较低浓度的活细胞的PCM立方体的抗压强度有显著的提高。然而，含有活细胞或死亡细胞质量的立方体的抗压强度随着细胞浓度和养护时间的增加而下降，这表明生物质对砂浆完整性的干扰。与未填充细胞的裂纹相比，填充细菌和沙子的裂纹的抗压强度和刚度值显着增加。
This paper describes an innovative biotechnology-utilizing, microbiologically-induced mineral precipitation for concrete remediation. Calcite precipitation induced by Bacillus pasteurii was studied in 2 types of portland cement mortar (PCM) specimens: 1 prepared from mixing with micro-organisms, and the other with simulated cracks filled with microbial mixtures. Study results show that there was a significant increase in compressive strength of the PCM cubes containing lower concentrations of live cels. Compressive strengths of the cubes containing live or dead cell mass, however, decreased as cell concentrations and curing time increased, suggesting the interference of mortar integrity by biomass. Cracks filled with bacteria and sand demonstrated a significant increase in compressive strength and stiffness values when compared with those without cells.