摘要
为了解掺入聚辛烯与硫磺对橡胶沥青性能的提升效果,以橡胶沥青的抗车辙因子G~*/sin(δ)、软化点及5℃延度值作为评价指标,基于四因素三水平正交试验探究剪切速率、胶粉掺量、剪切时间和剪切温度对沥青高低温性能的影响,并采用优化的工艺参数制备不同掺量(质量分数,下同)聚辛烯(0.5%、1.0%、1.5%)与硫磺(0.1%、0.5%)的橡胶沥青。通过软化点、动态剪切流变(58℃)、动力黏度(60℃)等指标评价其高温性能;开展不同温度下的弯曲梁流变试验研究其低温性能;通过弹性恢复及离析试验分析其弹性恢复能力与储存稳定性,并综合相关性能试验结果推荐聚辛烯与硫磺的最佳掺量。研究结果表明:胶粉掺量的增加可改善沥青高低温性能,剪切时间的延长与剪切温度的增加对橡胶沥青高低温性能影响不显著,剪切速率的加快会降低沥青低温性能,故制备工艺选取胶粉掺量为20%,剪切时间为60 min,剪切温度为180℃,剪切速率为1000 r/min;单独掺入硫磺对橡胶沥青的高温性能、弹性恢复能力几乎没有影响,与聚辛烯双掺改性则可以改善橡胶沥青的性能,且掺量越高其性能改善效果越显著;不同掺量的聚辛烯与0.1%硫磺双掺可改善橡胶沥青低温性能,同时提升其储存稳定性,在聚辛烯掺量为1.0%条件下效果最优。因此,建议使用0.1%的硫磺和1.0%的聚辛烯制备复合改性橡胶沥青。
The anti rutting factor G~*/sin(δ),softening point,and 5℃ductility of rubber asphalt were used as the evaluation indexes to explore the influence of shearing rate,rubber powder content,shear time,and shear temperature on the high and low-temperature performance to study the effect of a polyoctene and sulfur blend on the performance of rubber asphalt.The rubber modified asphalt with different amounts(mass fraction,same below)of polyoctene(0.5%,1.0%,and 1.5%)and sulfur(0.1%and 0.5%)were prepared using optimized process parameters.The high-temperature performance was evaluated by the softening point,dynamic shear rheology test(58℃),and dynamic viscosity(60℃).The bending beam rheometer test at different temperatures was conducted to study the low-temperature performance.The elastic recovery and storage stability were studied by elastic recovery and segregation tests and the optimal performance of polyoctene and sulfur were recommended by comprehensive performance test results.The results show that the increase of rubber powder can improve the high-and low-temperature performance of asphalt,the increase of shear time and shear temperature have no significant effect on it,and the increase of shear rate reduces its low-temperature performance.Therefore,the preparation process resulted in the following parameters,20%rubber powder,a 60 min shear time,a 180℃shear temperature,and a shear rate of 1000 r/min.The addition of sulfur alone has little effect on the high-temperature performance and elastic recovery of rubber asphalt.However,modifying it with polyoctene can improve its general performance,and the higher the dosage,the more significant the performance improvement effect.Furthermore,different dosages of polyoctene and 0.1%sulfur double doping can improve the low-temperature performance of rubber asphalt and improve its storage stability,this effect is optimal under a condition of 1.0%polyoctene.Therefore,using 0.1%sulfur and 1.0%polyoctene to prepare composite modified rubber asphalt is recommended.8 tabs,14
作者
熊剑平
刘聪
张明月
周智密
XIONG Jian-ping;LIU Cong;ZHANG Ming-yue;ZHOU Zhi-mi(Guangxi Key Lab of Road Structure and Materials,Guangxi Transportation Research and Consulting CO.,LTD.,Nanning 530007,Guangxi,China;Research and Development Center on Technologies,Materials and Equipment of High Grade Highway Construction and Maintenance Ministry of Transport,Guangxi Transportation Research and Consulting CO.,LTD.,Nanning 530007,Guangxi,China;Guangxi Liyu Expressway Co.,Ltd,Pingnan 537300,Guangxi,China;School of Traffic and Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,Hunan,China)
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第1期77-86,共10页
Journal of Chang’an University(Natural Science Edition)
基金
国家自然科学基金项目(51878075)
广西技术创新引导专项项目(桂科AC16380112)
广西自然科学基金项目(2018GXNSFAA294146)
广西重点研发计划项目(桂科AB17292035)
湖南省研究生科研创新项目(CX2018B541)
中央高校基本科研业务费专项资金项目(300102218509).
关键词
道路工程
橡胶沥青
聚辛烯
硫磺
制备工艺
性能评价
road engineering
rubber asphalt
polyoctene
sulfur
preparation process
performance evaluation
