环境热疲劳-硫酸盐侵蚀耦合作用对西部盐渍土地区混凝土力学性能的影响研究

doi:10.3973/j.issn.2096-4498.2025.S1.002

隧道建设（中英文） ›› 2025, Vol. 45 ›› Issue (S1): 11-22.DOI: 10.3973/j.issn.2096-4498.2025.S1.002

环境热疲劳-硫酸盐侵蚀耦合作用对西部盐渍土地区混凝土力学性能的影响研究

丁玉乔¹，张永旺²，高鲲¹，李福海³，王呼佳^{1， *}

（1. 中铁二院工程集团有限责任公司，四川成都 610031； 2. 河北省水文工程地质勘查院，河北石家庄 050021； 3. 西南交通大学土木工程学院，四川成都 610031）

出版日期:2025-07-15 发布日期:2025-07-15
作者简介:丁玉乔（1976—），女，河北定州人，2006年毕业于四川大学，岩土工程专业，硕士，高级工程师，现从事轨道交通工程结构与防水设计、混凝土结构耐久性等相关研究工作。E-mail： 6104698@qq.com。 *通信作者：王呼佳， E-mail： 84061908@qq.com。

Influence of Environmental Thermal Fatigue-Sulfate Erosion Coupling on Mechanical Properties of Concrete in Western Saline Soil Areas of China

DING Yuqiao¹, ZHANG Yongwang², GAO Kun¹, LI Fuhai³, WANG Hujia^{1, *}

(1. China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, Sichuan, China; 2. Hebei Prospecting Institute of Hydrogeology and Engineering Ceological, Shijiazhuang 050021, Hebei, China; 3. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China)

Online:2025-07-15 Published:2025-07-15

摘要/Abstract

摘要： 为研究西部盐渍土地区复杂环境下混凝土力学性能演变规律，通过自制加速腐蚀设备研究半浸泡在不同温度（20、40、60 ℃）、不同质量分数（0%、5%、10%）的硫酸钠溶液中混凝土表面产生的结晶程度以及轴心和分区抗压强度的变化规律。研究结果表明： 1）单硫酸盐侵蚀作用下混凝土出现结晶和轻微的混凝土剥落现象，其力学性能无明显衰减。2）单热疲劳作用对混凝土力学性能的影响不同，其中40 ℃热疲劳能提升混凝土的力学性能，而60 ℃热疲劳使力学性能显著衰减。3）热疲劳和硫酸盐侵蚀耦合作用下混凝土出现严重的结晶和剥落现象，力学性能大幅度衰减；耦合作用下热疲劳使混凝土在侵蚀前期出现劣化，而硫酸盐作用在侵蚀后期开始与热疲劳发生耦合效应加速混凝土劣化。4）混凝土吸附区和浸泡区的力学性能变化趋势相同，但吸附区的衰减幅度比浸泡区大得多；且通过回归分析发现分区的力学性能和整体性能之间存在较高的线性相关性，而吸附区的性能劣化是混凝土整体性能劣化的主要原因。

关键词: 西部盐渍土, 高温大温差, 热疲劳-硫酸盐侵蚀, 混凝土力学性能

Abstract: Herein, a self-made accelerated corrosion equipment is used to analyze the crystallization degree, axial and zonal compressive strength of concrete surface in different concentrations (0%, 5%, and 10%) of sodium sulfate solution at different temperatures ( 20 ℃, 40 ℃, and 60 ℃), revealing the effect of environmental thermal fatigue-sulfate erosion coupling on the mechanical properties of concrete in western saline soil areas in China. Findings are as follows: (1) Under the action of sulfate erosion, the morphology of the specimen shows crystallization and slight concrete spalling, but its mechanical properties exhibit no obvious attenuation. (2) The effect of thermal fatigue on the mechanical properties of concrete varies. The thermal fatigue at 40 ℃ improves the mechanical properties of the specimens, while the thermal fatigue at 60 ℃ significantly reduces the mechanical properties. (3) Under the coupling effect of thermal fatigue and sulfate erosion, the morphology of the specimens shows serious damages, such as serious crystallization and concrete spalling, and the mechanical properties also shows a significant attenuation. Under the coupling effect, the thermal fatigue causes the deterioration of the concrete from the early stage of the erosion, while the sulfate effect begins to accelerate the deterioration of the concrete in the late stage of the erosion. (4) Comparing the mechanical properties of the concrete adsorption zone and the immersion zone, it is found that although the two trends are the same, the attenuation of the adsorption zone is larger than that of the immersion zone. Regression analysis shows that the mechanical properties of partial concrete is highly correlated with overall concrete, and the deterioration of the concrete at the adsorption zone primarily causes the overall concrete deterioration.

Key words: western saline soil, high temperature and large temperature difference, thermal fatigue-sulfate corrosion, mechanical properties of concrete

丁玉乔, 张永旺, 高鲲, 李福海, 王呼佳. 环境热疲劳-硫酸盐侵蚀耦合作用对西部盐渍土地区混凝土力学性能的影响研究[J]. 隧道建设, 2025, 45(S1): 11-22.

DING Yuqiao, ZHANG Yongwang, GAO Kun, LI Fuhai, WANG Hujia. Influence of Environmental Thermal Fatigue-Sulfate Erosion Coupling on Mechanical Properties of Concrete in Western Saline Soil Areas of China[J]. Tunnel Construction, 2025, 45(S1): 11-22.

环境热疲劳-硫酸盐侵蚀耦合作用对西部盐渍土地区混凝土力学性能的影响研究

Influence of Environmental Thermal Fatigue-Sulfate Erosion Coupling on Mechanical Properties of Concrete in Western Saline Soil Areas of China

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