Abstract
Unbonded concrete overlay (UBCO) is used to improve the performance of the existing cracked jointed plain concrete pavement (JPCP). Unbonded JPCP overlay involves placement of an interlayer of hot mix asphalt (HMA), which acts as a separation layer between the existing concrete pavement and the JPCP overlay. One of the factors that affect the performance of unbonded JPCP overlays is existing pavement condition and the severity of damage of existing pavement immensely affects the performance of unbonded overlay. The severity of damage is described by the distressed elastic modulus thus, accurate determination of the distressed elastic modulus of the existing concrete pavement is essential for predicting the accurate performance of the unbonded overlay. This study focuses on analyzing the impact of distressed modulus by conducting simulations in the AASHTOWare pavement ME design software version 2.3 and evaluating the predicted performance of JPCP overlay for two different climatic regions. The results indicated that the distressed modulus of existing concrete pavement significantly affects the transverse cracking and pavement roughness of JPCP overlay while it has a minimal impact on joint faulting.
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