紫外线对沥青疲劳性能的影响

摘要

To improve the ultraviolet aging resistance and prolong the service life of pavement,this paper uses or-ganic montmorillonite,LDHs,carbon black three kinds of ultraviolet resistant materials to modify asphalt.Our country has a vast territory,UV intensity is quite different in different regions.So this paper also simulates the aging of asphalt under different UV intensity.The results show that ultraviolet resistant materials enhance the UV aging properties of asphalt under the same aging time and UV intensity.Fatigue factor of organic montmorillonite is minium,and the LDHs fatigue factor is slightly less than that of carbon black.The higher the UV intensity,asphalt fatigue factor is large,which means that the greater the degree of aging of asphalt,asphalt pavement performance worse.%针对紫外老化严重影响沥青路面的服役寿命的问题，该文通过在沥青中掺入有机蒙脱土、LDHs、炭黑3种紫外线阻隔材料来提升沥青耐紫外老化性能，进而提升沥青路面的抗紫外老化性能，延长路面的使用寿命。我国幅员辽阔，不同地区紫外线强度差异较大。因此该文还模拟了沥青在不同紫外线强度下的老化情况。结果表明在相同的紫外线强度和老化时间条件下，紫外阻隔材料提升了沥青的抗紫外老化性能。其中掺有机蒙脱土的老化后疲劳因子最小，掺 LDHs 疲劳因子要稍小于炭黑。随着二区至四区紫外线强度逐渐减弱，沥青疲劳因子也逐渐减小。紫外线强度越高，沥青疲劳因子也大，沥青老化程度越大，沥青路用性能越差。