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在研究沥青材料热氧老化规律的基础上,为进一步模拟路面实际状态,在长期老化试验中引入了水的因素.采用加水的PAV(压力老化容器)试验模拟沥青在寿命期的老化过程,以2个SHRP性能指标车辙因子G*/sinδ和劲度模量S(t)分别表示沥青的高温和低温性能,并用90#泰国沥青、90#改性沥青和70#壳牌沥青进行试验.结果表明:在水、温度和氧的共同作用下,水对高温性能指标G*/sinδ产生显著影响,所以水老化使沥青的高温性能急剧衰退,而对低温性能的影响并不显著.加水的PAV试验综合考虑了水、温度和氧气等环境因素的作用,能够提高模拟试验的精确性,更好地模拟沥青路面使用寿命期的长期老化过程.
Based on the study of thermal aging rules of asphalt materials, in order to further simulate the actual state of the road surface, the factors of water were introduced into the long-term aging test.The PAV (pressure aging container) test with water was used to simulate the aging process of asphalt Two SHRP performance indicators rutting factor G * / sinδ and stiffness modulus S (t), respectively, high and low temperature performance of asphalt, and with 90 # Thai asphalt, 90 # modified asphalt and # 70 Shell asphalt test results show : Under the combined effect of water, temperature and oxygen, water has a significant effect on the high temperature performance index G * / sinδ, so the aging of water makes the high temperature performance of asphalt decline sharply, but has no significant effect on low temperature performance. Considering the environmental factors such as water, temperature and oxygen, it can improve the accuracy of simulation test and better simulate the long-term aging process of asphalt pavement’s service life.