Porous asphalt (PA) has been widely used in many countries based on its positive benefits such as efficient water drainage, better traffic safety, and noise reduction. However, the attractive features of PA do not last for a long time due to the material degrading caused by clogging, stripping,and fast aging during the performance period. Application of fiber reinforcement materials can be a possible solution to overcome the structural weakness in porous asphalt pavements. This paper focuses on the fatigue investigation of fiber-reinforced porous asphalt composite system using a model mobile load simulator (MMLS). Carbon fiber reinforcement polymer (FRP) grids were used to strengthen the fatigue resistance of porous asphalt and they were placed between two asphalt layers as a reinforcement interlayer.The dynamic fatigue traffic loadings were applied on the top surface of reinforced specimens to investigate the performance improvement by reinforcement materials. These fatigue tests were conduced under four different conditions: unreinforced at dry; reinforced at dry; unreinforced at wet; andreinforced at wet. During the fatigue tests, transverse and longitudinal strains at the bottom of specimen were measured by installed strain gaugesand the transverse profiles of surface deflection were periodically measured in the middle of specimen by the profilometer. Also, the coaxial sheartest (CAST) was conducted to characterize the complex modulus of porous asphalt and both the aging and water sensitivity were compared. The fatigueresistance of porous asphalt at both dry and wet conditions was successfully improved by using interlaid carbon FRP grids.
Abstract