武汉工程大学学报2025，Vol.47Issue(6)：629-633,652,6.DOI:10.19843/j.cnki.CN42-1779/TQ.202411004
再生剂在再生沥青混合料中的扩散融合行为研究
Diffusion and fusion behavior of rejuvenator in recycled asphalt mixture
摘要
Abstract
To investigate the influence of mixing processes on the diffusion and fusion behavior between rejuvenator and aged/virgin asphalt,thereby promoting effective utilization of reclaimed asphalt pavement(RAP),recycled asphalt mixtures prepared using four processes(RAP preheating+warm-mix additive(HW process),RAP preheating(H process),RAP cold addition+warm-mix additive(CW process),RAP cold addition(C process))were subjected to layered extraction.Asphalt samples from the inner and outer layers of the mixture were obtained and analyzed using gel permeation chromatography(GPC)and atomic force microscopy(AFM).Analysis of GPC-normalized molecular weight curve and area integration of different regions revealed that the C process samples exhibited the most significant difference between the inner and outer layer curves(outer layer small-molecule content:33.1%;inner layer large-molecule content:26.3%),whereas the HW process samples showed the smallest difference(outer layer small-molecule content:25.7%;inner layer large-molecule content:21.3%).The H process and CW process samples showed intermediate results.AFM three-dimensional topography showed that both the C and HW process asphalt samples displayed denser,elongated,and smooth small bumps compared to the aged asphalt,with the bumps in the HW process samples more uniform than those in the C process samples.The results demonstrated that the fusion and diffusion process between the rejuvenator and the aged/virgin asphalt is not uniform.The effectiveness of diffusion and fusion under the different processes,ranked from strongest to weakest,is as follows:HW,H,CW,C.The process involving RAP preheating combined with warm-mix additive(HW process)is most conducive to promoting effective diffusion and fusion of the rejuvenator.关键词
道路工程/再生沥青混合料/分层萃取法/再生剂/扩散融合Key words
road engineering/recycled asphalt mixture/hierarchical extraction/regenerator/diffusion and fusion分类
交通工程引用本文复制引用
沈凡,钟亚聃,向天翔,谯理格..再生剂在再生沥青混合料中的扩散融合行为研究[J].武汉工程大学学报,2025,47(6):629-633,652,6.基金项目
国家自然科学基金(52178248) （52178248）
武汉市市政建设集团有限公司科技计划项目(wszky202109) （wszky202109）
