期刊
CEMENT & CONCRETE COMPOSITES
卷 118, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2021.103950
关键词
Microbially induced carbonate precipitation; Mathematical model; Crack repair; Biofilm growth; Calcium carbonate
资金
- National Natural Science Foundation of China [51578147]
- Fundamental Research Funds for the Cornell University [2242020R20025]
- Science and Technology Department of Ningxia [2020BFG02014]
This study developed a theoretical calculation model with microbially induced carbonate precipitation (MICP) to repair concrete cracks. The research found that the concentration of suspended biomass in cracks gradually decreased during the tests, while biofilm and solute concentrations were larger at the inlet, resulting in an increase in productive rates for CaCO3, indicating better repair effects. The proposed mathematical model represents a platform technology that utilizes microbial metabolism and repair period to impart novel multifunctionality to structural materials.
Concrete cracks have an adverse impact on the durability and safety of the concrete structures; and thus, repairing cracks to improve their mechanical properties is of great significance. Recently, microbially induced carbonate precipitation (MICP) has been extensively studied to repair concrete cracks; however, few studies focused on the theoretical quantitively model to study the repair effects of MICP. In this study, a theoretical calculation model with MICP was obtained by considering transport of solute, transport of suspended biomass, biofilm growth, geochemistry, ureolysis, and calcium carbonate (CaCO3) precipitation. Moreover, the feasibility and practicability of the mathematical model were demonstrated by the crack repair tests. The results showed that the calculated concentrations of suspended biomass in cracks gradually decreased during the tests; and the concentrations were larger for larger cracks. The comparison between the calculated results and experimental results demonstrated the correctness of transport mode of suspended biomass. The volume fractions of biofilm and solute concentrations were larger at the inlet, resulting in the increase of productive rates for CaCO3, which were consistent with experimental results. For smaller cracks, the consumed concentrations of solutes were larger, eventually leading to smaller sonic time values; and the upper parts of cracks had smaller sonic time values, indicating better repair effects. The proposed mathematical model represents a platform technology that leverages microbial metabolism and repair period to impart novel adjustive, sensing, biomineralization, and bioremediation multifunctionality to structural materials, which would lay a solid foundation for material remediation in civil engineering and material engineering fields.
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