Study on Water Damage Resistance of Plant-mixed Hot Recycled Mixture with High RAP Content
Plant-mixed hot recycled technology is an effective way to realize the low-carbon development of expressway construction and maintenance.In this paper,the AC-13 asphalt mixture used in the surface layer of the expressway is selected for the mix design of the hot recycled mixture,in which the Reclaimed Asphalt Pavement(RAP)content is 20％,30％,and 40％respectively,and the change in water damage resistance of the hot recycled mixture and its influencing factors were discussed.The results indicate that the effect of RAP content on water damage resistance is complex,and the change in TSR value between ordinary asphalt mixture and hot recycled mixture under multiple freeze-thaw cycles is inconsistent.Based on an analysis of the adhesion between asphalt and aggregate,it was found that the adhesion between RAP and asphalt is superior.Through the contact angle analysis of water and aggregate before and after aging of the asphalt film,it was observed that the water damage resistance of RAP is relatively better than that of new aggregate to some extent.Meanwhile,the study revealed that the RAP heating temperature and the porosity of the mixture significantly influence water damage resistance.Analyzing the water damage resistance performance of hot recycled asphalt mixtures requires comprehensive consideration of various factors such as material composition,volume characteristics,and recycling processes.
plant-mixed hot recycledmix designpavement performancemoisture damage
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