干湿循环与交变荷载作用下混凝土硫酸盐侵蚀损伤

doi:10.13229/j.cnki.jdxbgxb.20210794

摘要/Abstract

摘要：

针对盐富集地区混凝土性能损伤问题，通过自主研发试验装置模拟干湿循环与交变荷载作用下混凝土硫酸盐侵蚀，采用超声无损检测、孔结构分析、化学分析法、应力-应变测试分析混凝土受硫酸盐侵蚀宏微观性能劣化规律。研究结果表明：交变荷载对低强度等级混凝土的侵蚀作用更为严重。交变荷载增加混凝土中有害孔含量，加速了微裂纹的扩展，促进了硫酸根离子传输，加重了受蚀混凝土损伤。基于干湿循环与交变荷载作用下受硫酸盐侵蚀混凝土应力-应变曲线，以损伤度为变量，提出了受硫酸盐侵蚀混凝土相对峰值应力以及应变随损伤度变化的拟合方程。

关键词: 道路工程, 干湿循环, 硫酸盐侵蚀, 混凝土, 应力?应变曲线, 损伤度

Abstract:

Aiming at the problem of the damage of concrete in salt-rich areas， the self-developed equipment was used to simulate the environment of concrete subjected to sulfate corrosion under dry-wet cycles and alternating load. Ultrasonic nondestructive testing， pore structure analysis， chemical analysis， and stress-strain testing were used to analyze the macro and micro performance degradation laws of concrete damaged by sulfate erosion. The results showed that： The alternating load has a greater acceleration effect on the sulfate attack of low-strength grade concrete. The alternating load increases the content of harmful pores in the concrete， promotes the transmission of sulfate ions， and accelerates the sulfate corrosion reaction of the concrete. Based on the stress-strain curve of sulfate-eroded concrete under dry-wet cycles and alternating loads， with damage as a variable， a fitting equation for the relative peak stress and strain of sulfate-eroded concrete with the damage degree is proposed.

Key words: road engineering, dry-wet cycles, alternating load, sulfate attack, concrete, stress-strain curve, damage degree

中图分类号:

U414

关博文,邸文锦,王发平,吴佳育,张硕文,贾治勋. 干湿循环与交变荷载作用下混凝土硫酸盐侵蚀损伤[J]. 吉林大学学报(工学版), 2023, 53(4): 1112-1121.

Bo-wen GUAN,Wen-jin DI,Fa-ping WANG,Jia-yu WU,Shuo-wen ZHANG,Zhi-xun JIA. Damage of concrete subjected to sulfate corrosion under dry⁃wet cycles and alternating loads[J]. Journal of Jilin University(Engineering and Technology Edition), 2023, 53(4): 1112-1121.

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