RAP精细化油石分离技术及其工程应用

RAP Refined Oilstone Separation Technology and Its Engineering Application

沥青路面铣刨料(RAP)中的变异性现象是影响再生沥青混合料配合比设计和路用性能的重要因素之一。因此在工程实践中,迫切需要对RAP料进行预处理,分离老化沥青与石料,降低变异性。基于此,现介绍一种RAP油石分离新技术-精细化油石分离技术。首先介绍了该分离技术的工艺流程,试验评价了分离效果;然后采用精细化分离的RAP料制备再生混合料并应用于实体工程。结果表明,经过精细化分离处理后的RAP材料均匀稳定,变异性满足要求;旧集料的性能指标与新集料基本相同。再生沥青混合料的各项路用性能满足要求,高等级路面的施工质量可控,再生效果良好。

The variability of reclaimed asphalt mixtures(RAP)is one of the important factors to affect the mix design and pavement performances of the reclaimed asphalt mixtures.Therefore,in the engineering practice,it is urgently to pretreat RAP material and separate the aged asphalt and aggregates in order to reduce the variability.Based on this,a new separation method of RAP oilstone named the refined oilstone separation technology is introduced including its technological process.The separation effect is experimentally evaluated.The refined separated RAP material is used to prepare the reclaimed mixture and to apply in the practical projects.The result shows that the RAP material after refined separated and treated is even and stable,and the variability meets the requirements.The performance indexes of used aggregates are basically same as the new aggregates.Various pavement performances of reclaimed asphalt mixture all satisfy the requirement.The construction quality of high-class pavement is controllable and reclaiming effect is good.