盐冻循环条件下沥青高低温性能的灰关联熵分析

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。

High and low temperature performance of asphalt under salt freezing cycle by the grey relation entropy analysis

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.