基于黏弹性理论的天然沥青复合改性沥青低温流变性能  

Low Temperature Rheological Properties of Natural Asphalt Compound Modified Asphalt Based on Viscoelastic Theory

作　　者：于江[1] 赵群[1] 叶奋[2] 宋卿卿[2] YU Jiang;ZHAO Qun;YE Fen;SONG Qing-qing(Civil Construction College,Xinjiang University,Shanghai 201804,China;Urumqi 830047,China;Key Laboratory of Road and Traffic Engineering of Ministry of Education,Tongji University,Shanghai 201804,China)

机构地区：[1]新疆大学建筑工程学院,乌鲁木齐830047 [2]同济大学道路与交通工程教育部重点实验室,上海201804

出　　处：《科学技术与工程》2018年第32期217-225,共9页Science Technology and Engineering

基　　金：国家自然科学基金(51168044)资助

摘　　要：为优化天然沥青低温性能欠佳的问题,采用低温弯曲流变试验(BBR)对不同掺量下的橡胶/天然沥青及苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)/天然沥青复合改性沥青的低温性能进行试验;并结合Burgers模型对其蠕变数据进行拟合,以分析天然沥青复合改性沥青的低温性能。结果表明:橡胶和SBS掺入使新疆岩沥青(XRA)和天然湖沥青(TLA)天然改性沥青的黏性和弹性得到相应的改善;且其松弛时间逐渐减小,耗散能比与蠕变导数逐渐增加;低温下的应力松弛能力及弹性后效得到改善。在同一温度下,橡胶和SBS延缓了XRA与TLA到达蠕变稳定的时长;但随着温度的不断降低,其蠕变稳定时长逐渐减小。随着橡胶和SBS掺量的增加,XRA和TLA复合改性沥青的低温性能有显著的提高;且橡胶对XRA和TLA天然改性沥青低温性能的改善优于SBS。随着温度的降低,不同掺量下的橡胶和SBS对其低温性能的改善程度逐渐减小。In order to optimize the problem of low temperature performance of natural asphalt,low temperature bending rheology test(BBR)was used to test the low temperature performance of rubber/natural asphalt and styrene-butadiene-styrene block copolymer(SBS)/natural asphalt composite modified asphalt with different contents and combined with Burgers model to fit the creep data and to analyze the low temperature performance of natural asphalt composite modified asphalt.The results showed that the rubber and SBS incorporation improved the viscosity and elasticity of Xinjiang rock asphalt(XRA)and Trinidad Lake asphalt(TLA)natural modified asphalt,and the relaxation time gradually decreased,the dissipation energy ratio and the creep derivative gradually increased,and the stress relaxation ability and elastic after effects at low temperature were improved.At the same temperature,rubber and SBS delay the time that XRA and TLA reach creep stability,but as the temperature decreases,the creep stability time gradually decreases.At the same temperature,rubber and SBS delay the time that XRA and TLA reach creep stability,but as the temperature decreases,the creep stability time gradually decreases.With the increase of rubber and SBS content,the low-temperature performance of XRA and TLA composite modified asphalt has improved significantly.And rubber improves the low temperature performance of XRA and TLA natural modified asphalt better than SBS.With the decrease of temperature,the improvement of the low temperature performance of natural asphalt is gradually reduced with rubber and SBS at different dosages.

关 键 词：天然复合改性沥青 黏弹性 低温性能 BURGERS模型 

分 类 号：U414.75[交通运输工程—道路与铁道工程]