【摘要】 混凝土结构在实际工程中常受到硫酸盐侵蚀的影响，特别是在工业和环境条件复杂的区域，冲刷和硫酸根耦合作用下混凝土劣化更为严峻。本研究旨在探讨不同冲刷速度对混凝土中硫酸根离子侵蚀规律的影响，借助扫描电子显微镜(SEM)微观评价指标进一步揭示混凝土损伤劣化机理，并基于Fick定律对相应的模型进行修正。通过研究发现：随着冲磨速度增加，磨损率和抗冲磨强度均呈现增加趋势，初速度每增加200 r/min,磨损率提高25%左右。修正后的扩散模型，成功地描述了硫酸根离子在混凝土中的扩散过程，计算结果与实测值基本吻合，误差控制在5%左右。本研究为不同冲刷流速下混凝土结构受硫酸盐侵蚀的耐久性评估提供了理论和实验依据，对水工混凝土结构的服役和维护具有重要的工程应用意义。更多还原

【Abstract】 Concrete structures are often affected by sulfate attack in practical projects.The deterioration of concrete is more severe under the coupling effect of scouring and sulfate, especially, in areas with complex industrial and environmental conditions.The purpose of this study is to explore the influence of different scouring speeds on the erosion behavior of sulfate ions in concrete, to reveal the damage and deterioration mechanism of concrete by using SEM microscopic evaluation indicators and to modify the corresponding model based on Fick’s law.The study finds that with the increase in the grinding speed, the wear rate and grinding strength show an increasing trend, and that for every 200r/min increase in initial speed, the wear rate increases by about 25 %.The modified diffusion model successfully describes the diffusion process of sulfate ions in concrete, with the calculation results basically consistent with the measured values and the error controlled at about 5 %.This study provides theoretical and experimental basis for the durability assessment of concrete structures under sulfate erosion at different scouring speeds, which is of engineering application significance for the service and maintenance of hydraulic concrete structures.更多还原