基于数字散斑相关技术的老化沥青砂浆自愈合特性

沥青砂浆作为沥青混合料结构体系的分散相,其老化后的自愈合特性是影响沥青混合料路用性能的重要部分,结合沥青路面服务环境的实际情况,将老化程度及愈合时间作为条件,采用数字散斑技术进行沥青砂浆的损伤愈合实验,分析并观测其损伤愈合过程。结果表明,利用数字散斑相关技术可以很好地观测沥青砂浆损伤愈合过程;经过短期老化后的沥青砂浆在损伤愈合过程中预切口位移最大;长期老化后两种沥青砂浆的愈合值都有所提升,并且基质沥青砂浆比SBS沥青砂浆具有更好的愈合效果;沥青砂浆在愈合过程中分为二个阶段,第一阶段愈合速率较高,愈合值较大,第二阶段愈合率下降,愈合需要更长的时间。

Self-healingproperties of aged asphalt mortar based on digital speckle correlation technology

As the dispersed phase of asphalt mixture structure system,the self-healing characteristic of asphalt mortar after aging is an important part that affects the pavement performance of asphalt mixture.Combined with the actual situation of asphalt pavement service environment,taking the aging degree and healing time as the conditions,the damage healing test of asphalt mortar was carried out by using digital speckle technique,and the damage healing process of asphalt mortar was analyzed and observed.The test results show that the damage healing process of asphalt mortar could be well observed by using digital speckle correlation technology.The displacement of pre-cut of asphalt mortar after short-term aging was the largest,and the healing value of both kinds of asphalt mortar was improved after long-term aging.The healing process of asphalt mortar was divided into two stages.