关键词: 道路工程, 沥青路面, 厂拌热再生, RAP料掺量, 温度

Abstract: Aiming at the problem of low content of RAP in application of plant-mixed hot recycling asphalt pavement, the influence factors of RAP content were analyzed theoretically and experimentally by taking SMA-13 RAP material as the research object, which had been in service for 11 years in Huaian Bridge of Jiangsu Suhuai-Yancheng expressway. The analysis results show that the RAP content is affected comprehensively by four factors: the recovery of old asphalt performance, the adjustability of RAP aggregate gradation, the quality control of RAP aggregate gradation and asphalt aggregate ratio as well as the heating temperature of new aggregate. In practical engineering, the content of RAP material can be increased by adding regenerant, reducing the proportion of fine material in RAP material, controlling the deviation of the asphalt-aggregate ratio of RAP material and trying to reduce the heating temperature of new aggregate, so as to improve the economic and social benefits of plant-mixed hot recycling technology.

Key words: highway engineering, asphalt pavement, plant-mixed hot recycling, RAP content, temperature