天然岩沥青改性对沥青流变性能的影响  

Influence of Rock Asphalt Modified Bitumen on Asphalt Rheological Property

作　　者：陆兆峰[1,2] 何兆益[1] 秦旻[1] 黄刚[1] 

机构地区：[1]重庆交通大学土木建筑学院,重庆400074 [2]重庆交通大学机电与汽车工程学院,重庆400074

出　　处：《重庆交通大学学报（自然科学版）》2009年第3期543-547,共5页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：重庆市科技攻关项目(CSTS2006AB6014)

摘　　要：借助动态剪切流变仪（DSR）、低温弯曲流变仪（BBR）和Brookfild旋转黏度仪，对不同掺量的天然岩沥青改性沥青的性能进行了试验研究，分析了岩沥青改性剂对基质沥青流变性能的影响。结果表明：加入岩沥青后沥青胶结料的PG高温等级和黏度提高，抗车辙因子增大，相位角减小，大大提高了沥青的高温稳定性和降低了温度敏感性，且随着掺量的增加变化幅度增大；低温条件下蠕变劲度模量增大，低温性能有所下降，但当岩沥青掺量为2％～8％时，不会对沥青胶结料的低温性能产生大的不利影响。With the experiments of dynamic shear rheometer （DSR）, bending beam rheometer（BBR） and Brookfield rotary viscometer, the performances of modified asphalt with different mixing contents of rock asphalt are studied, and the rheology characteristics of modified asphalt are analyzed. The results indicate that the high temperature PG grades and the viscosity are enhanced ; the anti-rutting factor is increased and the phase angle is reduced; the high temperature stability is enhanced greatly and the temperature sensitivity is reduced after mixing in rock asphalt modifier. Furthermore, the change rate increases with the increase of the addition ; the creep stiffness modulus increases and low-temperature performance decreases at a low temperature. If the dosage of rock asphalt is controlled from 2% to 8% ,it would have no considerably adverse influence on low temperature performance.

关 键 词：岩沥青 流变性能 DSR 高温性能 

分 类 号：U414[交通运输工程—道路与铁道工程] U416.217