摘要
针对温拌再生技术中老化沥青性能变化及其机理问题,本文开展了70#基质沥青与SBS改性沥青的室内模拟老化研究。采用旋转薄膜烘箱(RTFOT)在163℃条件下制备不同老化时间的试样,以模拟再生沥青料(RAP)中沥青的老化状态,并结合化学组分分析、凝胶渗透色谱(GPC)及傅里叶变换红外光谱(FTIR)等手段,对不同老化程度沥青的物理性能、化学组成及分子结构变化进行了系统表征。结果表明,两类沥青在老化过程中均发生显著的分子聚合作用,大分子含量增加,小分子减少,极性官能团(羰基、亚砜基)含量随老化加深而上升,不饱和双键含量明显下降;但组成演化存在差异:基质沥青芳香分增加显著,而SBS改性沥青沥青质与胶质增加、饱和分下降。研究揭示了基质沥青与SBS改性沥青在热氧作用下的性能退化规律及差异,为老化沥青的再利用、改性优化及工程应用提供理论依据与技术参考。
To address the changes in properties and underlying mechanisms of aged asphalt in warm-mix recycling technology,a laboratory-simulated aging study was conducted on 70#base asphalt and SBS-modified asphalt.Asphalt specimens with varying aging times were prepared using the Rolling Thin Film Oven Test(RTFOT)at 163 to simulate the aging state of asphalt in reclaimed asphalt pavement(RAP).By combining chemical composition analysis,gel permeation chromatography(GPC),and Fourier transform infrared spectroscopy(FTIR),the physical properties,chemical composition,and molecular structural changes of asphalt at different aging degrees were systematically characterized.The results show that both types of asphalt undergo significant molecular polymerization during aging,with an increase in macromolecular content,a decrease in small molecules,and a rise in the content of polar functional groups(carbonyl and sulfoxide)as aging progresses,accompanied by a notable reduction in unsaturated double bonds.However,compositional evolution exhibited distinct differences:base asphalt experienced a significant increase in aromatics,while SBS-modified asphalt showed an increase in asphaltenes and resins,with a decrease in saturates.This study elucidates the performance degradation patterns and differences of base asphalt and SBS-modified asphalt under thermo-oxidative conditions,providing theoretical support and technical references for the reuse,modification optimization,and engineering application of aged asphalt.
作者
蔡晖
伍秉顺
高晓影
吴志刚
CAI Hui;WU Bingshun;GAO Xiaoying;WU Zhigang(Fujian Expressway Maintenance Engineering Co.,Ltd.,Fuzhou Fujian 350007,China)
出处
《交通节能与环保》
2025年第6期114-119,共6页
Transport Energy Conservation & Environmental Protection
基金
福建省高速公路科技项目(202403GS)。
关键词
基质沥青
SBS改性沥青
沥青老化
温拌再生技术
组分分析
base asphalt
SBS-modified asphalt
asphalt aging
warm-mix recycling technology
component analysis
