基于黏弹特性的SBS改性沥青多次再生效果评价  

Effect Evaluation of Multiple Recycled SBS Modified Asphalt Based on Viscoelastic Properties

作　　者：邹桂莲[1] 秦欢 鄢然[1] 孙杰 ZOU Guilian;QIN Huan;YAN Ran;SUN Jie(School of Civil Engineering & Transportation,South China University of Technology,Guangzhou 510640,Guangdong,China;Infrastructure Branch,Highway Bureau of Transport of Shandong Province,Jinan 250001,Shandong,China)

机构地区：[1]华南理工大学土木与交通学院,广东广州510640 [2]山东省交通运输厅公路局基建处,山东济南250001

出　　处：《华南理工大学学报（自然科学版）》2019年第7期75-82,共8页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家科技支撑计划项目(2014BAC07B01);山东省交通运输厅资助项目(2018B20)~~

摘　　要：采用动态力学分析方法(DMA法)对SBS改性沥青多次再生前后的黏弹特性进行研究,通过比较复数剪切模量、相位角、车辙因子、弹性恢复率和不可恢复的蠕变柔量等参数评价SBS改性沥青独特黏弹特性的保留程度与再生效果,并采用荧光显微镜对老化与再生过程进行观测.结果表明:随着老化与再生次数的增多,再生剂对SBS改性沥青黏弹性能的再生效果越来越差SB,S改性沥青独特黏弹特性逐渐丧失;多次再生后沥青对应力水平的敏感性增强,弹性恢复能力变差,越来越接近硬质沥青,难以满足适用于SBS改性沥青的MSCR分级标准;老化过程中SBS逐渐发生聚合、相容性变差,再生剂只能补充老化过程中沥青组分的迁移造成的轻质组分的减少,但不能重新分散SBS改性剂、不能改善SBS与沥青的相容性SB;S改性沥青3次及以上再生时,如果只采用再生剂再生,可考虑将之作为硬质沥青进行应用,如果不降低改性沥青路面的路用性能,新添加的改性沥青应添补旧沥青丧失的SBS黏弹特性,针对性定制新的改性沥青将成为技术途径.The dynamic mechanical analysis(DMA) method was adopted to study the viscoelastic properties of multiple recycled SBS modified bitumen.The recycling effect and the retention degree of unique viscoelasticity of SBS modified asphalt were evaluated by comparing the parameters such as complex modulus,phase angle,the variation of rutting factors,elastic recovery rate and unrecoverable creep compliance.The aging and regeneration processes were observed by fluorescence microscope.The results show that recycling effect of SBS modified asphalt is getting worse and the unique viscoelasticity of SBS modified asphalt is decreasing gradually with the increased times of asphalt aging and recycling.Multiple stress repeated creep(MSRC) tests show that the repeated recycled asphalt is more sensitive to the stress level,and the elastic recovery ability becomes worse and closer to the hard asphalt.Therefore,it is difficult to meet the MSCR classification standard suitable for SBS modified asphalt.Fluorescence microscope was used to observe the aging and regeneration process.The images show that the SBS is polymerized gradually during the aging process,and the compatibility become worse.The rejuvenating agent could only supplement the decrease of the light component caused by the migration of the asphalt component during the aging process.However,the SBS modifier can't be redispersed.If SBS modified asphalt has been regenerated three times or more,and only rejuvenating agent can be used,then the recycled SBS modified asphalt can be used as hard asphalt.In oder to keep good road performance of modified asphalt pavement,the newly added modified asphalt should supplement old asphalt's loss of SBS viscoelastic characteristics.So customizing new modified asphalt will become a technical approach.

关 键 词：SBS改性沥青 DMA方法 黏弹特性 再生剂 老化 

分 类 号：U414[交通运输工程—道路与铁道工程]