硫酸盐耦合冻融循环环境下玻璃粉对混凝土抗腐蚀性能的影响  

Effect of glass powder on corrosion resistance of concrete in a sulfate-coupled freeze-thaw cycle environment

作　　者：李鸿玮 汪金满 王鑫 石旭东 杨艳华 LI Hong-wei;WANG Jin-man;WANG Xin;SHI Xu-dong;YANG Yan-hua(Gansu Construction Design Consulting Group Co.Ltd.,Lanzhou 730050;Gansu Province Fifth Construction Group Co.Ltd.,Tianshui 741000;School of Civil Engineering,Tianshui Normal University,Tianshui 741001;Gansu Provincial Transportation Research Institute Group Co.Ltd.,Lanzhou 730030)

机构地区：[1]甘肃省建设设计咨询集团有限公司,甘肃兰州730050 [2]甘肃省第五建设集团有限责任公司,甘肃天水741000 [3]天水师范学院土木工程学院,甘肃天水741001 [4]甘肃省交通科学研究院集团有限公司,甘肃兰州730030

出　　处：《兰州理工大学学报》2024年第5期23-31,共9页Journal of Lanzhou University of Technology

基　　金：天水市科技支撑计划项目(2021-GXJSK-1633);甘肃省建设厅科技项目(Jk2021-35);天水市秦州区科技重大专项计划(2022-SHFZG-9025);甘肃省科技厅中小企业创新基金(22CX3GA073)。

摘　　要：设计了质量分数5%、10%及15%的Na_(2)SO_(4)溶液耦合冻融循环腐蚀试验.分析了玻璃粉对混凝土抗腐蚀性能的影响,揭示了Na_(2)SO_(4)溶液浓度对混凝土腐蚀速率的影响,并研究了玻璃粉对混凝土孔隙结构及界面过渡区(ITZ)性能的影响.结果表明:掺量为0~10%时,玻璃粉对混凝土抗腐蚀性能存在显著的提升作用,而掺量大于15%时,玻璃粉对混凝土抗腐蚀性能存在劣化行为.Na_(2)SO_(4)溶液浓度大于7.5%时,C_(b)、i_(m)及S均随溶液浓度的增大而增大,宏观表现为Na_(2)SO_(4)溶液对混凝土的腐蚀作用随其浓度的增大而增强.相比于普通混凝土,掺加5%及10%的玻璃粉混凝土ITZ劈拉强度分别增大了13.17%、10.89%,ITZ宽度分别降低了15、5μm.The coupled freeze-thaw cyclic corrosion tests of Na_(2)SO_(4)solution with concentrations of 5%,10%,and 15%were designed.The effect of glass powder on the corrosion resistance of concrete was analyzed,the effect of Na_(2)SO_(4)solution concentration on the corrosion rate of concrete was revealed,and the effect of glass powder on the pore structure and interface transition zone(ITZ)properties of concrete was studied.The results showed that the glass powder significantly improves the corrosion resistance of concrete at a dosage of 0~10%,while the glass powder deteriorates the corrosion resistance of concrete when the dosage is greater than 15%.At the same time,when the concentration of Na_(2)SO_(4)solution is greater than 7.5%,C_(b),i_(m),and S all increase with the increase of the concentration of Na_(2)SO_(4)solution,which shows that the corrosion effect of Na_(2)SO_(4)solution on concrete is enhanced with the increase of the concentration.After adding 5%and 10%glass powder,ITZ split tensile strength of concrete increases by 13.17%and 10.89%,respectively,while ITZ width decreases by 15μm and 5μm,respectively compared with ordinary concrete.

关 键 词：Na_(2)SO_(4)溶液 玻璃粉 结冰膨胀率 孔隙结构 

分 类 号：TU528.1[建筑科学—建筑技术科学]