This study investigated the degradation behavior of concrete properties in the saline soil region of Northwest China through indoor tests conducted in the corrosive environment of Lake Taitama, Xinjiang. A damage degree was established using the loss rates of compressive strength, dynamic elastic modulus, and mass as variables. The factors influencing the variation in damage degree were elucidated by examining the evolution of microscopic pore structure, internal sulfate content, and corrosion products over time. Additionally, a concrete service life prediction model was formulated based on Wiener's theory, with the damage index as a variable. Results indicated that compressive strength, dynamic elastic modulus, and mass initially increased but subsequently declined over time under erosion. Damage degree exhibited a non-linear variation as a quadratic function of corrosion time, characterized by a gradual acceleration in damage rate and interdependence between damage degrees. The concentration of sulfate ions within concrete increased with erosion time and diminished with erosion depth. The sulfate ion diffusion coefficient decreased exponentially with corrosion age and damage severity. Total porosity initially decreased before increasing, exhibiting an S-curve relationship with damage. The X-ray diffraction tests revealed that the chemical reaction between sulfate and hydration products resulted in a decrease in calcium hydroxide content and an increase in ettringite and gypsum content, elucidating the microscopic mechanism underlying damage evolution. The concrete service life prediction curve exhibited a three-stage variation, with the damage index based on compressive strength loss demonstrating a higher sensitivity in concrete life prediction. The findings from this study can serve as a valuable reference for predicting concrete corrosion resistance and service life in the saline soil region of Northwest China.

来源平台：JOURNAL OF BUILDING ENGINEERING