短期老化对胶粉改性沥青高温性能的影响  

Effect of short-term aging on high-temperature properties of crumb rubber modified asphalt

作　　者：张智豪[1] 李波[1] 魏永政 ZHANG Zhi-hao;LI Bo;WEI Yong-zheng(National and Provincial Joint Engineering Laboratory of Road ＆ Bridge Disaster Prevention and Control, Lanzhou Jiaotong University, Lanzhou 730070, China;Gansu Province Highway Maintenance Engineering Research Center, Gansu Hengda Road and Bridge Group Co., Ltd., Lanzhou 730070, China)

机构地区：[1]兰州交通大学道桥工程灾害防治技术国家地方联合工程实验室,甘肃兰州730070 [2]甘肃恒达路桥工程集团有限公司甘肃省高等级公路养护工程研究中心,甘肃兰州730070

出　　处：《现代化工》2018年第9期105-109,111,共6页Modern Chemical Industry

基　　金：国家自然科学基金项目(51408287;51668038);长江学者和创新团队发展计划滚动资助(IRT-15R29);甘肃省杰出青年基金项目(1606RJDA318);甘肃省自然科学基金项目(1506RJZA064);兰州交通大学优秀科研团队项目(201606)

摘　　要：为了研究短期老化对胶粉改性沥青高温性能的影响,采用薄膜烘箱试验(TFOT)对胶粉改性沥青进行老化,通过动态剪切流变试验(DSR)、重复蠕变恢复试验(RCRT),从流变性角度分析了不同老化因素对胶粉改性沥青性能的影响,并结合扫描电镜(SEM)从微观层面对沥青及胶粉老化前后的表观形貌进行分析。结果表明,老化作用使得胶粉改性沥青G*提高、tanδ减小、沥青的高温抗变形能力提高,而老化温度与老化时间的提高则促进了沥青老化程度的加深;老化过程中胶粉仍存在强烈的溶胀与降解反应,两种作用共同促进了胶粉改性沥青的180℃特殊流变性;老化作用使得胶粉改性沥青(εP/εL)减小、沥青变形恢复能力提高,相比于老化温度,老化时间对胶粉改性沥青变形恢复能力的影响更为显著;沥青中的胶粉受老化影响较小,从而使沥青保持较好的弹性。To find out the effect of short-term aging on the high-temperature properties of crumb rubber modified asphalt（CRMA）,a series of lab tests including dynamic shear rheological test（DSR） and repeated creep recovery test（RCRT） are performed to study the effects of different aging factors on the properties of CRMA that is aged in a thin film oven test（TFOT）.The morphology changes of asphalt and rubber powder before and after aging are analyzed from the microscopic level by means of SEM.The results show that the aging action increases G＊of CRMA,causes CRMA＇s tan δto decrease and helps asphalt to improve deformation resistance at high temperature. Both the increases of aging temperature and the extending of aging time can promote the aging degree of asphalt. There is still strong swelling and degradation reactions for rubber powder during the aging process,both reactions promote the special rheological properties of CRMA at 180℃.CRMA＇s recovery ability is improved after aging.Compared with the aging temperature,the aging time has a more significant effect on the deformation and recovery ability of CRMA. Rubber powder within asphalt is less affected by aging,which therefore gives asphalt good elasticity.

关 键 词：道路工程 橡胶沥青 短期老化 流变性能 重复蠕变恢复试验 

分 类 号：U414[交通运输工程—道路与铁道工程]