Abstract: In order to study the effect of different steel slag dosing on the road performance of asphalt mixes,five asphalt mixes with different steel slag volume dosing were prepared by replacing the same size basalt coarse aggregate with steel slag by equal volume,and the high temperature,low temperature and water stability performance of the asphalt mixes were studied. The dynamic stability,rut depth,maximum flexural tensile strain,bending stiffness modulus,residual stability and freeze-thaw splitting strength ratio were selected as evaluation indexes. The comprehensive performance evaluation model of steel slag asphalt mixture was established based on entropy weight TOPSIS method,and the optimal steel slag volume content was determined. The results showed that steel slag can significantly improve the high temperature stability and water stability of asphalt mixes by replacing some basalt coarse aggregates;The low temperature crack resistance of common basalt asphalt mixes is significantly better than that of steel slag asphalt mixes. Based on the entropy-weight TOPSIS theory,the optimal volume dosing of steel slag in asphalt mixes is recommended to be 50%.

Key words: steel slag,asphalt mixture,road performance,entropy weight TOPSIS model,comprehensive evaluation,optimal steel slag dosing