Estimation of relative performance of reinforced overlaid asphalt concretes against reflection cracking due to bending more fracture

Most of overlaid asphalt pavements are facing with reflection cracking in an early age of service life. In this study, a numerical prediction model for fatigue life was developed by modifying crack growth rate, da/dN, of Paris law with horizontal deformation rate, du/dN, to compare relative performance of the material choice based on experimental test result. Experimentally, an interlayer between old concrete pavement and overlay asphalt pavement, polymer modifiers and fiber were used to retard initiation and progress of reflection crack. An expedited reflection cracking test method was developed and applied to various bitumen mixture-concrete block test bodies. The results were compared with one another in terms of resistance against reflection cracking. The coefficient of determination of predicted life and measured life was very high (r2 = 0.98). Therefore, it was shown that the fatigue life of each bitumen material and interlayer combination can be estimated using the prediction model developed in this study.