摘要
首先使用70号基质沥青剪切制备了废胶粉改性沥青,并进行了多应力蠕变恢复(MSCR)试验,分析改性沥青在不同应力和温度条件下蠕变恢复和永久变形情况并且研究J_(nr)与软化点的相关性;其次采用普通沥青、废胶粉改性沥青和SBS改性沥青分别制备了混合料进行车辙试验,分析沥青混合料的抗车辙和相对变形等情况,对J_(nr)与车辙动稳定度、相对变形率之间的相关性进行探究。结果表明:在一定程度上,废胶粉(CR)的掺入可以改善沥青的高温性能;沥青的高温性能受到废胶粉掺量及制备时的剪切时间影响。在一定范围内,随着废胶粉的添加量和剪切时间的增加,废胶粉对沥青的改性效果不断增强,在废胶粉掺量达到20%、剪切时间为60min时,平均可恢复蠕变率(R)达到了最大值,不可恢复柔量(J_(nr))达到了最小值。并且J_(nr)分别与软化点、相对变形率具有显著的相关性。在一定范围内,随着废胶粉掺量的不断增加,沥青混合料的车辙相对变形率低至2.84%。
In this study,multiple stress creep recovery(MSCR)test was used to evaluate the high temperature performance of CR modified asphalt(CRMA).At first,one base asphalt binder with a penetration value of 70 and one CR were mixed at different contents,sing the method of Multiple Stress and Creep Recovery(MSCR)test,with 70^(#) matrix asphalt,SBS modified asphalt and comparing the CRMA test,analyzed their creep recovery under different conditions of stress and temperature,high temperature rutting resistance performance.The experimental results show that the mixed CR in a certain extent,can improve the high temperature performance of asphalt.And dosage of CR modified asphalt preparation when the shear time had a greater influence on the performance of asphalt in high temperature.Within a certain range,with the increase of CR content and shearing time,CR for asphalt modification effect,on the CR content reaches 20%,shear time is 60 min,CR modified effect is optimal.
作者
范璐璐
鲍远洋
邢宏源
涂亮亮
刘刚
FAN Lu-lu;BAO Yuan-yang;XING Hong-yuan;TU Liang-liang;LIU Gang(Shenzhen Municipal Engineering Corp,Shenzhen 518034,China;Anhui Construction Engineering Test and Research Institute Co Ltd,Hefei 230001,China;State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China)
出处
《武汉理工大学学报》
CAS
北大核心
2019年第5期17-25,共9页
Journal of Wuhan University of Technology
关键词
废胶粉
废胶粉改性沥青
多应力蠕变恢复实验
高温性能
crumb rubber
crumb rubber modified asphalt
multiple stress creep recovery test
high-temperature behavior
