Influences of Pavement Material and Structure on the High-Temperature Stability of Double-Layer Pavements

Abstract

Double-layer paving technology is a new construction technique for asphalt pavements. Few laboratory studies have been conducted on the influences of pavement layer thickness and mixture types on the high-temperature stability of double-layer pavement surfaces. This paper aims to evaluate the effectiveness of different paving technologies, mixture type combinations, and structural layer thickness combinations on the high-temperature stability of pavement surfaces. The results indicate a 15% improvement in the dynamic stability of double-layer paving and a 7% reduction in rutting deformation relative to that of conventional paving. Compared to the AC-13/AC-25 combination, the AC-16/AC-20, AC-16/AC-25, and AC-13/AC-20 mixture type combinations enhance dynamic stability by at least 69%, 58%, and 26%, respectively, and decrease rutting deformation by at least 18%, 5%, and 3%, respectively. Thickness combinations of 4/6 cm and 3/7 cm improve dynamic stability by at least 35% and 67%, respectively, and decrease rutting deformation by at least 14% and 26%, respectively, compared to the 5/5 cm thickness combination. To effectively improve the high-temperature stability of pavements, a double-layer pavement structure with a 3 cm AC-16 surface layer and a 7 cm AC-20 bottom layer is recommended. The pavement compaction and roughness of double-layer paving meet the standard requirements, as verified, through field testing.