长江科学院院报2024，Vol.41Issue(7)：168-174,7.DOI:10.11988/ckyyb.20230126
矿化煤矸石混凝土抗硫酸盐侵蚀性能
Sulfate Corrosion Resistance of Microbial Mineralized Coal Gangue Concrete
摘要
Abstract
Orthogonal tests with four factors at three levels were conducted to investigate the sulfate corrosion resist-ance of concrete under varying microbial concentration,urea concentration,calcium ion concentration,and coal gangue replacement rate.Subsequently,mechanical testing and sulfate resistance dry-wet cycle experiments were performed on coal gangue concrete specimens.The findings demonstrate that microbial mineralization technology markedly enhances the mechanical properties of coal gangue concrete.Coal gangue replacement rate exerts the lar-gest influence on the strength of coal gangue concrete,followed by bacterial solution concentration,calcium ion concentration,and urea concentration in descending order.Optimal ratios for mechanical properties and sulfate cor-rosion resistance of microbial mineralized coal gangue concrete are as follows:bacterial solution concentration of 4x 108 cells/mL,urea concentration of 0.9 mol/L,calcium ion concentration of 0.2 mol/L,and a coal gangue re-placement rate of 30％.The formation of ettringite through sulfate reaction with hydration products primarily ac-counts for early-stage quality improvement and compressive strength enhancement during dry-wet cycles,and also contributes to later-stage apparent salinization,volume expansion,bulge drop,and strength reduction.This study serves as an experimental foundation for understanding the mechanics and durability of microbial mineralized coal gangue concrete.关键词
矿化煤矸石混凝土/微生物矿化/正交试验/抗硫酸盐侵蚀/干湿循环Key words
mineralized coal gangue concrete/mineralization of microorganisms/orthogonal experiment/sulfate corrosion resistance/drying and wetting cycle分类
建筑与水利引用本文复制引用
潘铖,郑志明,杨逾..矿化煤矸石混凝土抗硫酸盐侵蚀性能[J].长江科学院院报,2024,41(7):168-174,7.基金项目
国家自然科学基金项目(51774167) （51774167）
辽宁省重点实验室项目(LJZS002) （LJZS002）
辽宁省"兴辽英才计划"科技创新领军人才项目(XLYC1802063) （XLYC1802063）
辽宁工业大学博士启动基金项目(XB2021012) （XB2021012）
