利用动态剪切流变仪(DSR)和弯曲梁流变仪(BBR)对冻融循环前后的三种沥青(沥青、苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)改性沥青、胶粉改性沥青)进行测试,比较分析不同冰冻温度、融雪盐浓度、冻融循环次数下三种沥青的高低温性能变化规律,并对环境因素进行灰熵分析.结果表明:在盐冻循环条件下对沥青复合模量G*影响最大的因素是融雪盐溶液浓度,其次是10 ℃延度;对沥青相位角δ影响最大的因素是软化点,其次是25 ℃针入度;对沥青蠕变劲度模量S影响最大的因素是融雪盐溶液浓度,其次是10 ℃延度;对沥青蠕变速率m影响最大的因素是试验温度,其次是冰冻温度.
The dynamic shear rheometer (DSR) and bending beam rheometer (BBR) were utilized to test three asphalt(asphalt,styrene-butadiene-styene blockcopolymer(SBS) odified asphalt,rubber powder modified asphalt) before and after freeze-thaw cycles.The variation orderliness of high and low temperature performance of three asphalt under different freezing temperature and the concentration of snow melting salt and the cycle times of freeze-thaw were compared.Then the environment factors by grey correlation entropy were analyzed.The result shows that the most important factor on the complex modulus of asphalt (G*) is the concentration of snow melting salt,followed by 10 ℃ ductility.The factor which has the greatest impact on phase angle of asphalt (δ) is softening point,followed by 25 ℃ penetration.And the biggest influencing factor on the creep stiffness modulus of asphalt(S)is the concentration of snow melting salt,followed by 10 ℃ ductility.The factor which have the greatest impact on creep rate of asphalt (m) is test temperature,followed by freezing temperature.
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