To improve the rutting resistance of the middle hot-mix asphalt (HMA) surface layer, composite modification of asphalt-concrete (AC) mixture by styrene–butadiene–styrene (SBS) and anti-rutting additive (ARA) was studied. First, the wheel-tracking test, bending test, and indirect tensile test were conducted to evaluate the effect of three dosages of ARA on the high-temperature performance, low-temperature performance, and moisture susceptibility of SBS-modified AC mixture and the optimum dosage of ARA was determined. Then the high-temperature rutting-resistance performance of composite-modified AC mixtures was studied through the dynamic modulus test and uniaxial creep test. The results showed that the high-temperature performance of composite-modified AC mixture was significantly improved, but the low-temperature performance and moisture susceptibility were slightly declined compared to the control mixture (SBS-modified AC mixture without ARA). The values of E*/sinφ of composite-modified AC mixture were larger than those of the control mixture at various test temperatures and loading frequencies. The values of permanent deformation and creep rate of composite-modified AC mixtures were smaller than those of the control mixture. In conclusion, composite-modified AC mixture has excellent high-temperature stability.
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