Finite Element Analysis of Reflection Crack in AC+CRC Composite Pavement

In order to provide input for estimate the service life of the composite pavement, the authors established the stress analysis model for the continuously reinforced concrete with asphalt concrete overlay (AC + CRC) composite pavement with initial cracking, by using the finite element software, and analyzed the corresponding normal stress and shear stress under symmetry and eccentric loading.The stress intensity factors for reflection cracking in the AC layer were quantified with varying structure thickness, modulus, steel ratio and AC-CRC inter-layer conditions.Results of the analysis indicate that increasing thickness of AC layer, modulus of subbase, steel ratio, and inter-layer bonding can delay the propagation of the reflection cracking.However, the modulus and thickness of CRC layer, and modulus of AC layer have little effects on the cracking propagation.These results could provide a theoretical basis for designing AC + CRC composite pavement.