回收微塑料制备改性沥青混凝土及其性能研究OACSTPCD

In order to enhance the comprehensive property of asphalt concrete,waste polypropylene(PP)microplastics were utilized to modify the asphalt matrix,resulting in the preparation of AC-13 asphalt concrete.The study focused on the properties of both asphalt and asphalt concrete.The results show that the addition of microplastics improves the deformation resistance and high-temperature stability of the modified asphalt,as well as enhances the mechanical properties,high temperature stability,low temperature stability,and water stability of the asphalt concrete.With a microplastic content of 4%,compared to the matrix asphalt,the modified asphalt exhibits a 20%reduction in penetration at 25℃and a 12℃increase in softening point.At the same microplastic content of 4%,in comparison to the matrix asphalt concrete,the modified asphalt concrete shows an 11.6%increase in immersion Marshall residual(MS0)and a 12.8%increase in freeze-thaw splitting tensile strength ratio(TSR),an 86%improvement in dynamic stability,a 67.0%reduction in rut depth,a 14.6%decrease in volume of air voids(VV),a 21.1%increase in Marshall stability(MS),a 7.8%increase in voids filled with asphalt(VFA),and a 35.6%increase in low-temperature bending failure strain.