Investigation of Aged Asphalt Film Transfer during Hot In-Place Recycling of Asphalt Pavement

Abstract

The aged asphalt film transfer between new and old aggregate during hot in-place recycling of asphalt pavement was investigated in this paper. The mechanism of asphalt film transfer between new and old mixture was analyzed by connective mass transfer theory. Based on the theoretical analysis, influence factors for asphalt film transfer during hot in-place recycling were summarized. Then laboratory tests simulating the file hot in-place recycling process were conducted to investigated the asphalt film transfer between new and old aggregate based on different influence factors design. The test results indicated that preheating temperature, mixing time and recycling agent are the key influence factors during hot in-place recycling process. Suggestions to guarantee the quality of hot in-place recycling asphalt mixture were given in this paper.

Research on Old Asphalt and the Regeneration Agent Compatibility Test

“…If the old material in the batch process, the old asphalt still wrapped in old aggregate surface, or transferred to the new aggregate proportion rarely, then there will be uneven distribution of recycling mixture of asphalt, and lead to the old asphalt membrane thicker, and new asphalt film thickness is thin relatively. Therefore, this will extremely detrimental to stability of the recycled mixture performance and durability [10].…”