This study aims to evaluate the effects of acetic acid modification on the properties of steel slag and its asphalt mixtures,and to explore the micro-mechanisms of modification.Steel slag is treated with different concentrations(5%,10%,and 15%)of acetic acid solution,and compared with untreated steel slag and basalt.This research comprehensively employs macro and micro experi-mental methods.On the microscopic level,Scanning Electron Microscope(SEM)and X-ray Fluores-cence Spectroscopy(XRF)techniques are used to reveal the changes in chemical composition and micro-morphology of the modified steel slag.On the macro level,the focus is on evaluating the road performance and volumetric expansiveness of the steel slag asphalt mixture.The results show that ace-tic acid treatment significantly reduced the expansive substances(f-CaO and f-MgO)on the surface of steel slag,effectively inhibiting its volumetric expansion.At an acetic acid concentration of 15%,the volumetric expansion rate of the steel slag asphalt mixture can be reduced to 0.3%.Moreover,acetic acid modification has little impact on the physical and mechanical properties of steel slag,and the adhe-sion between the modified steel slag and asphalt is good,resulting in excellent road performance of the modified steel slag asphalt mixture.
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