中文摘要：

利用数字图像相关技术（DSCM）针对紫外光老化的沥青混合料（HMA）半圆试件弯拉试验中裂纹产生及扩展规律从细观角度进行表征,运用Vic-3D分析软件对沥青混合料半圆试件进行全场位移、应变计算,得到试件破坏过程的位移场、应变场。结果表明：通过对紫外光照的沥青胶浆、集料及界面水平方向应变场的对比分析,发现界面为沥青混合料最薄弱处,最易产生裂纹;进一步通过水平方向应变随载荷变化曲线的变化对HMA开裂时间进行分析,可以更好地将HMA微裂缝开裂时间与宏观裂缝开裂时间加以区分,且紫外老化后的HMA试样界面开裂时间明显缩短。同时,将相同的紫外老化前后的橡胶粉（CR）改性HMA试样与苯乙烯-丁二烯-苯乙烯（SBS）改性HMA试样的位移随载荷变化规律进行对比发现,经紫外老化后的CR改性HMA比紫外老化后SBS改性HMA具有更强的抗开裂能力及持荷能力。

英文摘要：

The digital speckle correlation method（DSCM）was taken to conduct a mesoscopic-level characterization on crack initiation and propagation patterns in semi-circular shaped hot-mix asphalt（HMA）specimens that were aged by ultraviolet lights and under tension-bending test.Vic-3Danalysis software was employed to calculate the whole field displacement and strain,and displacement and strain fields of specimen rapturing process were obtained.The results show that,based on the comparison among asphalt mortar under ultraviolent lights,aggregate and the strain field along horizontal direction,the interphase is the weakest part of the hot-mix asphalt and it is more prone to producing crack.Further analysis of curve of strain along horizontal direction changing with load on HMA cracking time better reveals the time difference in initiating HMA micro-cracks and macro-cracks,and ultraviolet aging can noticeably shorten the interface initiating cracks time in HMA specimens.At the same time,upon receiving same ultraviolet aging,crumb rubber（CR）modified HMA has better cracking resistance and load-bearing capacity than styrene butadiene styrene（SBS）modified HMA based on comparing the patterns of load changing with displacement between CR modified HMA and SBS modified HMA specimens.