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

兰州理工大学学报 ›› 2024, Vol. 50 ›› Issue (5): 23-31.

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

李鸿玮^*1, 汪金满², 王鑫³, 石旭东², 杨艳华⁴

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

收稿日期:2024-02-27 出版日期:2024-10-28 发布日期:2024-10-31
通讯作者: 李鸿玮(1992-),男,甘肃秦安人,硕士,高级工程师.Email:821537966@qq.com
基金资助:
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)

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

LI Hong-wei¹, WANG Jin-man², WANG Xin³, SHI Xu-dong², YANG Yan-hua⁴

1. Gansu Construction Design Consulting Group Co. Ltd., Lanzhou 730050;
2. Gansu Province Fifth Construction Group Co. Ltd., Tianshui 741000;
3. School of Civil Engineering, Tianshui Normal University, Tianshui 741001;
4. Gansu Provincial Transportation Research Institute Group Co. Ltd., Lanzhou 730030

Received:2024-02-27 Online:2024-10-28 Published:2024-10-31

摘要/Abstract

摘要： 设计了质量分数5%、10%及15%的Na₂SO₄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Na₂SO₄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.Na₂SO₄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Na₂SO₄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、5 μm.

关键词: Na₂SO₄溶液, 玻璃粉, 结冰膨胀率, 孔隙结构

Abstract: The coupled freeze-thaw cyclic corrosion tests of Na₂SO₄ 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 Na₂SO₄ 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 Na₂SO₄ solution is greater than 7.5%, C_b, i_m, and S all increase with the increase of the concentration of Na₂SO₄ solution, which shows that the corrosion effect of Na₂SO₄ 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 by13.17% and 10.89%, respectively, while ITZ width decreases by 15 μm and 5 μm, respectively compared with ordinary concrete.

Key words: Na₂SO₄ solution, glass powder, freezing expansion rate, pore structure

中图分类号:

TU528.1

李鸿玮, 汪金满, 王鑫, 石旭东, 杨艳华. 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[J]. 兰州理工大学学报, 2024, 50(5): 23-31.

LI Hong-wei, WANG Jin-man, WANG Xin, SHI Xu-dong, YANG Yan-hua. Effect of glass powder on corrosion resistance of concrete in a sulfate-coupled freeze-thaw cycle environment[J]. Journal of Lanzhou University of Technology, 2024, 50(5): 23-31.

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