Key Influencing Factors and Repair Efficacy of Microbial-induced Calcium Carbonate Precipitation (MICP) for Concrete Crack Restoration in Saline Environments
WANG Xiaoli1, ZHANG Wen1,2,3,*, WANG Xinhong4, YUAN Yuan5, HE Yunxiu5, DU Yimo1
1 School of Civil Engineering and Water Resources, Qinghai University, Xining 810016, China 2 Qinghai Key Laboratory of Building Energy-saving Materials and Engineering Safety, Xining 810016, China 3 Qinghai Key Laboratory of Compressed Air Energy Storage, Xining 810016, China 4 CEC Qinghai Electric Power Design Institute Corporation, Xining 810007, China 5 Faculty of Water and Civil Engineering, Qinghai Vocational and Technical University, Xining 810016, China
Abstract: Saline soils accelerate concrete deterioration through salt-crystallization swelling and corrosion, triggering structural cracks that compromise infrastructure integrity. Conventional repair techniques relying on physicochemical mechanisms face challenges including high costs, limited durability, and environmental concerns. This work presents an eco-friendly microbial-induced calcium carbonate precipitation (MICP) strategy for crack remediation in saline-affected concrete. Through comparative analysis of indigenous microorganisms from Qinghai’s saline soils and common microbial strains, staphylococcus sp. A80 demonstrates superior growth characteristics, enzymatic activity, and biomineralization capacity under saline environments (5% NaCl, pH=10). Orthogonal experimental design identified optimal mineralization parameters as: A80 inoculation, 0.75 mol/L Ca2+ concentration, 0.7 mol/L urea substrate, and 35 ℃ incubation temperature. Experimental results revealed that the injection-permeation technique demonstrates superior efficacy in C30 concrete crack remediation, achieving a 46.37% reduction in water permeability coefficient and a 28.93% increase in compressive strength over a 28-day period. Microstructural analysis confirms the formation of stable calcite crystals effectively filled concrete microcracks, significantly improving the mechanical performance and durability of the treated concrete. This work establishes an eco-friendly technological framework with theoretical foundations for medium-strength concrete rehabilitation in saline environments.
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2026, Vol. 40 
