Study On The Behavior Of Pavement Structure Of Hot Rolled Asphalt

Hot Rolled Asphalt (HRA) is a fine aggregate and gap-graded material. The majority of fine aggregate and the minority of coarse aggregate make the HRA reach a very small, or even close to zero porosity, coupled with high oil, so that HRA has a higher tensile strength and water permeability, but also effectively reduces ultraviolet penetration, slows down the aging process of the mixture. The HRA is suitable for high altitude, large temperature difference and clammy highway pavement material.This report is mainly about the adaptability of applications of HRA in the alpine region. First we will analyze the characteristics of the composition of HRA; then the impact of the temperature in the alpine region is reflected through choosing the stiffness modulus of asphalt and asphalt mixture. And we comparatively analyze the changes of the stiffness modulus in different temperature between HRA and domestic traditional AC, the SMA pavement. On this basis, referring to "highway asphalt pavement design specifications", using a set of two-wheeled double round uniform load and using the road professional software BISAR, we discuss the distribution law of surface deflection, the maximum tensile stress in the bottom of surface layers and baseground in different situations such as straight-line sections, steep sections and sharp bends sections among three asphalt pavement (HRA, AC, SMA). Also the influences in the bottom of baseground tensile stress in different layers’combination are discussed. It turns out that improving inter-layer combination state help to reduce cracking possibilities.Through this research, HRA has greater low temperature flexibility than AC, SMA due to its specific graded composition, and therefore better adapts to alpine region. Hope that this report can play a role of verification and reference in the applications of HRA in the alpine region.