短期老化对温拌橡胶沥青路用性能的影响

Effects of short-term aging on pavement performance of warm asphalt rubber

为了研究短期老化对温拌橡胶沥青路用性能的影响,首先利用质量损失实验对其老化前后组成成分的质量变化进行初步的评估与分析;采用针入度、软化点、动态剪切流变实验对旋转薄膜烘箱短期老化前后橡胶沥青材料路用性能的差异性进行比较,同时借助凝胶渗透色谱对作用机制进行分析与验证。研究表明:虽然老化前后橡胶沥青的路用性能稍微减弱,但改性作用仍然在可接受范围内,且均比普通基质沥青高出很多;虽然液态降黏减阻剂本身平均分子质量较小,在短期老化过程中容易蒸发,但这种作用保护了基质沥青当中的轻质组分,有效地减缓了老化进程,温拌橡胶沥青较普通橡胶沥青和基质沥青具有更好的抗老化性能。

To study the influence of short-term aging on the performance of warm-mix rubber asphalt pavement,the composition changes of rubber asphalt before and after aging were evaluated and analyzed using mass loss value.The performance of rubber asphalt before and after RTFO-aging was tested by needle penetration,softening point,and dynamic shear rheological tests.The mechanism of action was analyzed and verified by gel permeation chromatography(GPC).The results show that the performance of rubber asphalt pavement is slightly lost before and after aging.However,the modified asphalt is still within the acceptable range,much higher than that of ordinary base asphalt.Although the average analysis amount of liquid warm mix and Evotherm-DAT is small,it is easy to evaporate in the short-term aging process.However,this effect also protects the light components in the base asphalt and slows down the aging process.and warm-mix rubber asphalt has a better anti-aging effect than asphalt rubber and base asphalt.