The changes of cleavage strength of SBR modified asphalt mixture and base asphalt mixture can reflect the rule that the asphalt mixture changes with time by using ultraviolet aging at different time.

• 试验中利用不同时照的紫外线老化,SBR改性沥青混和料与基质沥青混合料的劈裂强度变化,反映出沥青混合料随时间变化的规律。