The area of gap-graded asphalt pavement is increased to improve safety of expressways. The surface texture has been measured by volumetric method like sand patching and generally such method does not give us the detail of characteristics of texture and its influence to the skid resistance exactly. Therefore, stationary model of laser profilometer was used to measure the profile of gap-graded asphalt pavement and new method was applied to analyze the characteristics of texture. The findings of this study are that firstly, the amount of tire penetration into the surface texture is the decisive factor of skid resistance on gap-graded asphalt pavement, the amount of tire penetration reaches at certain level even if PDI get bigger, and it makes skid resistance to have same tendency. Therefore, proper profile depth is found to satisfy both enough skid resistance and durability of pavement. Secondly, microtexture also plays important role to decide the magnitude of skid resistance depending on the nature. Analyzing skid resistance, BPN, Profile Depth Index(PDI), we can evaluate the influence of microtexture volumetrically. (A)
Abstract