A systematic review of rigid-flexible composite pavement

Rigid-flexible composite pavement has gained significant popularity in recent decades. This paper provides a comprehensive review of the research progress concerning rigid-flexible composite pavement, aiming to promote its application and address key issues while identifying future directions. The design theory and methodology of rigid-flexible composite pavement are discussed, followed by a description of its structural and mechanical behavior characteristics. The load stress, temperature stress, and their interactive effects between the asphalt layer and the rigid base were analyzed. It is clarified that the asphalt layer serves a dual role as both a “functional layer” and a “structural layer”. Typical distresses of rigid-flexible composite pavement, which primarily occur in the asphalt layer, were discussed. These distresses include reflective cracking, top-down cracking, rutting, and compressive-shear failure. Generally, the integrity of the rigid base and the interlaminar bonding conditions significantly impact the performance and distress of the asphalt layer. The technology for enhancing the performance of rigid-flexible composite pavement is summarized in three aspects: asphalt layer properties, rigid base integrity, and interlaminar bonding condition. The study concludes that developing high-performance pavement materials based on their structural behaviors is an effective approach to improve the performance and durability of rigid-flexible composite pavement. The integrated design of structure and materials represents the future direction of road design.