沥青多次再生性能研究

沥青路面热再生技术因其性能优良、质量稳定,已在国内得到广泛应用。学者主要针对沥青的一次老化与再生问题进行了相关研究,对于沥青多次老化再生问题还很少涉及。选择70号基质沥青为研究对象,采用室内试验模拟沥青3次老化、再生过程,通过针入度、软化点、延度、布氏黏度等试验探讨了基质沥青多次再生路用性能的变化规律。研究结果表明,基质沥青经历多次老化、再生,再生时再生剂掺量相同的情况下,高温性能提升,流变性能变差,低温性能衰减;掺加再生剂时应重点关注老化沥青低温性能的恢复。

Performance Investigation of Multiple Recycling of Asphalt

The utilization of the recycled hot mix asphalt technology has been widely promoted due to its advantage of performance and quality.However,researchers mainly focus on the aging and recycling of asphalt for one time,the study of multiple aging and recycling of asphalt is still scarce.The 70# base asphalt is selected for this study and the laboratory tests are carried out to simulate multiple aged and recycled asphalt for three times.A series of laboratory tests including the penetration test,soften point test,ductility test,Brookfield viscosity test and others are carried out to investigate the performance evolution trend of multiple recycling of base asphalt.The results indicated that when the base asphalt is subjected by multiple aging and recycling,considering that the mixing amount of recycling agent is same,the high-temperature performance is promoted,while the rheological property and low-temperature performance decrease.Besides,emphasis must be placed on the regeneration of low-temperature performance of aged asphalt with recycling agent.