橡胶改性沥青及老化特征微观尺度分析  

Analysis on crumb rubber modified asphalt and its aging characteristics on microscale

作　　者：何亮[1,2,3] 马育[4] 凌天清[3] 马涛[5] 黄晓明[5] 

机构地区：[1]长安大学特殊地区公路工程教育部重点实验室,西安710064 [2]长沙理工大学道路结构与材料交通行业重点实验室,长沙410004 [3]重庆交通大学交通土建工程材料国家地方联合工程实验室,重庆400074 [4]重庆交通大学材料科学与工程学院,重庆400074 [5]东南大学交通学院,南京210096

出　　处：《功能材料》2015年第21期21093-21098,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51308572);中国博士后基金面上资助项目(2014M562361);特殊地区公路工程教育部重点实验室开放基金资助项目(2014G1502017);道路结构与材料交通行业重点实验室(长沙)开放基金资助项目(kfj140303)

摘　　要：为了在微观尺度下分析橡胶改性沥青及老化特征,制备了普通橡胶沥青和脱硫橡胶沥青,首先分析了两种橡胶改性沥青制作前后橡胶颗粒的变化特征,然后通过凝胶渗透色谱实验建立了两种橡胶改性沥青的分子量分布与宏观路用性能的对应关系,最后综合宏观技术指标与红外光谱半定量分析研究了两种橡胶改性沥青的老化特征。结果表明,经过高速剪切工艺大粒径的脱硫橡胶粒在沥青里大多分散成无明显颗粒的细小物质,而普通橡胶粉剪切后基本保持其原有颗粒核心;普通橡胶沥青具有最高的大分子LMS的比例,这与其最优异的高温稳定性与低温抗裂性相对应;普通橡胶沥青的TFOT短期老化中存在着强烈的胶粉持续溶胀作用,但在PAV长期老化中主要发生氧化老化作用,而脱硫橡胶沥青的TFOT短期老化和PAV长期老化均以沥青的氧化老化为主;普通橡胶沥青比脱硫橡胶沥青更加耐受TFOT短期老化。In order to analyze the crumb rubber modified asphalt and its aging characteristics on microscale,asphalt-rubber(AR)and desulfurized rubber asphalt(DRA)were produced,first the two kinds of rubber particle characteristics were analyzed both before the crumb rubber modified asphalt were made and after,then the relationship between molecular weight distribution of the two kinds of crumb rubber modified asphalt and their road performance was established by gel permeation chromatography(GPC)test,at last their aging characteristics were researched based on both technique index results and Fourier transform infrared(FT-IR)spectroscopy semi-quantitative analysis.The result showes that,after high speed shearing process desulfurized rubber particles were dispersed into minimal ones in the asphalt,but the ordinary crumb rubber also kept their particle cores after sheared;AR has the largest proportion of large molecular size(LMS)correspond with the best road performance at high or low temperature;AR continues in a strong swelling in TFOT short-term aging,while oxidation aging is dominating in PAV long-term aging,but to DRA oxidation aging is dominating both in TFOT short-term and PAV long-term aging;the aging resistance of AR in TFOT short-term aging was better than that of DRA.

关 键 词：道路工程 橡胶改性沥青 老化特性 凝胶色谱 红外光谱 

分 类 号：U416.217[交通运输工程—道路与铁道工程]