界面过渡区 (ITZ) 对混凝土的耐久性至关重要。然而，文献中并未充分研究干湿循环和硫酸盐侵蚀下 ITZ 损伤特性和力学性能的演变。因此，本文提出了基于圆柱腔膨胀理论的ITZ膨胀模型，然后计算了ITZ在硫酸盐侵蚀下的力学性能演变。利用膨胀比、扫描电子显微镜(SEM)和X射线衍射(XRD)分析了水灰比(w/c)为0.3、0.4和0.5的混凝土的内部侵蚀和膨胀特性。结果表明，混凝土的膨胀率随着侵蚀龄期和w/c的增加而增加。新的衍射峰出现在硫酸盐侵蚀后的 XRD 图中。γ ) 和内摩擦角 ( φ )、内聚力 ( C ) 对内应力和塑性区宽度的影响最大。最终内应力和塑性区宽度受w/c影响，0.4w/c的混凝土破坏程度最小。该研究为干湿循环和硫酸盐侵蚀下混凝土和ITZ的损伤机制提供了新的见解，其结果为提高混凝土的耐久性提供了新的视角。

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Interfacial transition zone (ITZ) is of paramount importance to the durability of concrete. However, the evolution of damage characteristics and mechanical properties of ITZ under dry-wet cycles and sulfate erosion were not fully investigated in the literature. Therefore, this paper presents the expansive model of ITZ based on cylindrical cavity expansion theory, following by calculation of mechanical properties evolution of ITZ under sulfate erosion. The expansion ratio, Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD) were utilized to analyze the internal erosion and expansion characteristics of concrete with the water-cement ratio (w/c) of 0.3, 0.4 and 0.5. The results indicate that the expansion ratio of concrete increases with the erosion age and w/c. The new diffraction peaks appear in the XRD pattern after sulfate erosion. As compared with Poisson's ratio (γ) and internal friction angle (φ), cohesive force (C) has the largest influence on the internal stress and plastic zone width. The final internal stress and plastic zone width are affected by w/c, and the damage degree of concrete with 0.4 w/c is the minimum. This study provides new insights into damage mechanism of concrete and ITZ under dry-wet cycles and sulfate erosion, the results of which provide new perspectives for improving the durability of concrete.