海水
碳酸钙
材料科学
分解
降水
尿素
碳酸盐
钙
过程(计算)
离子
化学工程
海洋学
冶金
复合材料
气象学
地质学
有机化学
化学
物理
计算机科学
工程类
操作系统
作者
Qi Fan,Liang Fan,Wai‐Meng Quach,Jizhou Duan
标识
DOI:10.1016/j.cemconcomp.2024.105631
摘要
As an environmentally friendly biotechnology, the microbial induced calcium carbonate precipitation (MICP) provides a new approach to repair concrete cracks. Most existing studies focused on finding a suitable environment for bacteria to induce as much calcium carbonate as possible, but the effect of actual concrete service environment on the repair of concrete cracks was usually ignored. This work compared the repair quality of cracked specimens via MICP with the original Sporosarcina (Sp.) pasteurii strain and salt-tolerant Sp. pasteurii strain in the deionized water and simulated seawater. Then the adverse effects of seawater ions on the MICP process was investigated. The results showed that the permeability coefficient of repaired specimens was 175.7 % higher, and the bond strength between the calcium carbonate and concrete surface was lower in the simulated seawater as compared with the deionized water environment. The high concentration of sodium, chloride, magnesium, and sulfate ions in the seawater led to the decrease of the urea decomposition rate and calcium carbonate yield rate, which further induced the decreased super-saturation of calcium carbonate and the conversion of the calcium carbonate crystal form from calcite to vaterite. Besides, the salt-tolerant strain with a high salt adaptability showed a higher repair ability in the simulated seawater as compared with the original strain.
科研通智能强力驱动
Strongly Powered by AbleSci AI