Abstract
To investigate the impact of chloride ion erosion in marine environments on the microstructure and macroscopic mechanical properties of solidified soil, this study combines fractal theory with image processing techniques to analyze the changes in cement-solidified soil (CS), steel slag powder + cement-solidified soil (SSP-CS), and activator-doped steel slag powder + cement-solidified soil (A-SSP-CS) under different ion erosion conditions. Erosion tests were conducted for 7 to 120 days using seawater, distilled water, and typical corrosive ions in seawater (Cl⁻, Mg²⁺), and the unconfined compressive strength (UCS) of the specimens was measured. Scanning electron microscopy (SEM) and OpenCV techniques were employed to process microstructural images of the specimens, extracting and calculating the fractal dimensions. The results show a strong correlation between UCS changes and fractal dimension variations for CS, A-SSP-CS, and SSP-CS under different erosion conditions. Fractal dimensions effectively characterize the influence of microstructural changes on macroscopic performance and can predict the strength evolution of solidified soils in various erosion environments, providing a scientific basis for improving the erosion resistance of marine solidified soils.