紫外老化对复合改性沥青混合料路用性能影响

Effect of Ultraviolet Aging on Pavement Performance of Composite Modified Asphalt Mixture

沥青混合料在高海拔地区由于恶劣的环境因素影响导致其性能衰减,其中较大辐照度的紫外线使路面在短期内出现“泛白”现象,影响沥青面层的使用寿命。选取几种抗紫外老化复合改性沥青方案进行室内沥青混合料抗紫外老化研究。借助自主开发的耐气候环境老化箱对沥青混合料进行紫外老化模拟试验,研究复合改性沥青对混合料抗紫外老化的效果。结果表明与苯乙烯-丁二烯-苯乙烯(SBS)改性沥青相比,L64和L4分别比SBS改性沥青未老化之前的断裂能分别提升了8.16%和5.86%,L64和L4紫外老化后的复合改性沥青具有更好的抗裂性能和抗疲劳性能以及高温稳定性,其结果对于预防沥青路面紫外老化具有较大的工程价值。

In the high altitude area,the performance of asphalt mixture deteriorates due to the influence of harsh environmental factors.Among them,the large irradiance of ultraviolet makes the pavement appear“white”in a short time,which affects the service life of asphalt surface.Several anti-ultraviolet aging composite modified asphalt schemes were selected to study the anti-ultraviolet aging of indoor asphalt mixture.The ultraviolet aging simulation test of asphalt mixture was carried out by means of the self-developed weather-resistant aging chamber,and the effect of the composite modified asphalt on the ultraviolet aging resistance of the mixture was studied.The results showed that compared with SBS modified asphalt,the fracture energy of L64 and L4 was 8.16%and 5.86%higher than that of SBS modified asphalt before aging,respectively.The composite modified asphalt after ultraviolet aging of L64 and L4 had better crack resistance,fatigue resistance and high temperature stability.The research results have great engineering value for preventing ultraviolet aging of asphalt pavement.