SBS/SBR改性沥青PG分级及其在西藏地区的适用性研究  

The PG Grade of SBS/SBR Modified Asphalt and Its Adaptability in Tibet Area

作　　者：徐霈[1] 王祺[1] 张宏 吴卓科 XU Pei;WANG Qi;ZHANG Hong;WU Zhuoke

机构地区：[1]招商局重庆交通科研设计院有限公司,重庆400067 [2]西藏自治区重点公路建设项目管理中心,拉萨850000 [3]海南省路桥投资建设有限公司,海口570203

出　　处：《公路交通技术》2018年第6期44-49,共6页Technology of Highway and Transport

基　　金：交通运输部西部建设科技项目(2014318J15070)

摘　　要：为了对比SBS和SBR两种改性沥青的流变特性,通过动态剪切流变(DSR)试验和小梁弯曲(BBR)试验对2种改性沥青进行了对比研究,并进行了PG性能分级。通过现场对西藏各典型地区路面埋设传感器进行路表最高温度实测,采用SHRP方法计算路表最高温度,并与实测路表最高温度进行对比修正,提出了西藏地区沥青路面路表最高温度预估公式,从而分析SBS和SBR两种改性沥青在西藏各地区的适用性。研究结果表明:SBS改性沥青的高温抗变形能力优于SBR改性沥青,但其低温抗裂性能弱于SBR改性沥青。在中高温下,SBR改性沥青的抗疲劳开裂性能优于SBS改性沥青;在高温下,SBS改性沥青的抗疲劳开裂性能优于SBR改性沥青。To compare the performance of SBS and SBR modified asphalt and analyze the applicability of two modified asphalt in Tibet area,the paper focuses on the contrast of the rheological properties of two modified asphalt by dynamic shear rheological test and bending beam creep test,and grades their performance is graded.The contrast and correction have been made between the maximum temperature of asphalt pavement surface estimated by SHRP calculation and measured data,and this paper proposes the maximum temperature prediction formula of asphalt pavement surface in Tibet.By comparing the PG grade of SBS and SBR modified asphalt,this paper analyzes the adaptability of two modified asphalts in various regions of Tibet.The results shows that SBS modified asphalt has better high-temperature deformation resistance than SBR modified asphalt.However,its low-temperature crack resistance is weaker than SBR modified asphalt.At medium temperature,the anti-fatigue cracking performance of SBS modified asphalt is weaker than SBR modified asphalt,but SBS modified asphalt is better than SBR modified asphalt at high temperature.

关 键 词：改性沥青 流变特性 PG分级 西藏地区 路表温度 

分 类 号：U416.217[交通运输工程—道路与铁道工程]