酸性干湿循环作用下钢渣透水混凝土损伤演化规律OA

To address the performance degradation of steel slag permeable concrete in acid rain-prone areas susceptible to under the synergistic effect of wet-dry cycles and acid corrosion,and to clarify its damage evolution mechanism,failure mode and quantitative evaluation method,this study conducted uniaxial compression-acoustic emission tests,permeability coefficient tests and acidic wet-dry cycle tests.The damage evolution process was quantitatively characterized by means of acoustic emission b-value analysis and RA-Fa correlation analysis.The results show that the degradation rates of compressive strength and elastic modulus of steel slag permeable concrete in an acidic environment(pH=4)are higher than those in a neutral environment(pH=7).The permeability coefficient in both environments exhibits a non-monotonic variation trend of first increasing,then decreasing and rising again.The failure is dominated by physical shear damage in the neutral environment,while in the acidic environment,the synergistic effect of chemical dissolution and physical degradation leads to pore loosening,resulting in tensile failure-dominated mode.After 30 wet-dry cycles,the quantitative wet-dry cycle damage variables of steel slag permeable concrete are 0.45 in the acidic environment and 0.40 in the neutral environment,respectively.This study can provide an experimental basis and quantitative data support for the durability evaluation and service life prediction of steel slag permeable concrete pavements in acid rain-prone areas.