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

作　　者：潘铖 郑志明[2] 杨逾[2] PAN Cheng;ZHENG Zhi-ming;YANG Yu(Department of Civil and Architectural Engineering,Liaoning University of Technology,Jinzhou 121001,China;School of Civil Engineering,Liaoning Technical University,Fuxin 123000,China)

机构地区：[1]辽宁工业大学土木建筑工程学院,辽宁锦州121000 [2]辽宁工程技术大学土木工程学院,辽宁阜新123000

出　　处：《长江科学院院报》2024年第7期168-174,共7页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(51774167);辽宁省重点实验室项目(LJZS002);辽宁省“兴辽英才计划”科技创新领军人才项目(XLYC1802063);辽宁工业大学博士启动基金项目(XB2021012)。

摘　　要：为研究微生物菌液浓度、尿素浓度、钙离子浓度、煤矸石取代率对矿化煤矸石混凝土抗硫酸盐侵蚀性能的影响,开展4因素3水平正交试验。结果表明:微生物矿化技术可显著提升煤矸石混凝土力学性能,煤矸石混凝土强度影响排序为煤矸石取代率>菌液浓度>钙离子浓度>尿素浓度,微生物矿化煤矸石混凝土力学性能和抗硫酸盐侵蚀性能的最优配比为:菌液浓度4×10^(8) cells/mL、尿素浓度0.9 mol/L、钙离子浓度0.2 mol/L、煤矸石取代率30%;硫酸盐与水化产物反应生成钙矾石是硫酸盐干湿循环前期质量和抗压强度提升的主要原因,也是后期表观形态盐化、体积膨胀、鼓包掉落、强度降低的主要原因。研究成果可为微生物矿化煤矸石混凝土力学和耐久性提供试验依据。Orthogonal tests with four factors at three levels were conducted to investigate the sulfate corrosion resistance 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 largest 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 corrosion resistance of microbial mineralized coal gangue concrete are as follows:bacterial solution concentration of 4×10^(8) cells/mL,urea concentration of 0.9 mol/L,calcium ion concentration of 0.2 mol/L,and a coal gangue replacement rate of 30%.The formation of ettringite through sulfate reaction with hydration products primarily accounts 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 

分 类 号：TU528[建筑科学—建筑技术科学]