SBS改性沥青的黏温特性研究  

A study on the viscosity and temperature properties of SBS modified asphalts

作　　者：李宁利[1] 李铁虎[1] 陈华鑫[2] 张争奇[2] 

机构地区：[1]西北工业大学,陕西西安710072 [2]长安大学,陕西西安710064

出　　处：《土木工程学报》2007年第10期86-90,共5页China Civil Engineering Journal

基　　金：国家西部交通建设科技项目(2001-318-000-38)

摘　　要：SBS改性沥青的黏温特性与普通沥青不同。用目前的黏度测试方法测试SBS改性沥青黏度,根据黏温曲线确定的SBS改性沥青混合料的拌和与压实温度过高,过高的拌和与压实温度会引起SBS改性沥青的老化、环境和生产安全问题。从改性沥青的高温流变特性入手,分析改性沥青的黏度试验方法,研究SBS改性沥青的黏度变化规律。由试验结果可知,当温度低于150℃时,黏度对温度的依赖性很大,但是当温度高于150℃时,黏度对温度的依赖性逐渐减小;随着温度的升高,SBS改性沥青的黏度值对剪切速率的依赖性逐渐减弱。因此在测试SBS改性沥青的黏度时,必须在试验温度下规定相应的剪切速率,这对合理确定SBS改性沥青的拌和与压实温度至关重要。The viscosity and temperature properties of SBS modified asphalts differ from that of unmodified asphalts. Viscosity measurements based on the current procedure would predict relatively high mixing and compaction temperatures, which may lead to the deterioration of SBS modified asphalts, cause environmental concerns and safety issues. Measurements of SBS modified asphalt viscosity are analyzed, and the viscosity variation of SBS modified asphalt studied. The viscosity of SBS modified asphalt is dependent on temperature and shear-rate. Results show that 150℃ is a separation point for the temperature dependency, with the influence of temperature being significant below 150℃ and insignificant above 150℃ .The shear-rate dependency decreases with the increase of temperature. Therefore, viscosity measurement should correspond with specified shear rate at temperature, which is important for appropriately defining the mixing and compaction temperatures of SBS modified asphalts.

关 键 词：SBS改性沥青 黏度 流变特陛 旋转黏度计 

分 类 号：U414.3[交通运输工程—道路与铁道工程]