基于DIC方法的沥青混合料断裂机理研究

Study on Split Mechanism of Asphalt Mixture Based on Dic Method

开裂是沥青路面早期破坏主要形式之一。为研究沥青混合料的断裂性能,对胶粉改性沥青混合料小梁进行三点弯曲试验,利用CCD摄像头跟踪拍摄了沥青混合料小梁变形破坏的全过程,并利用数字图像相关技术(DIC)计算了弯曲过程中小梁的变形及应变云图。结果表明:沥青混合料的抗弯曲断裂性能取决于沥青砂浆、沥青与骨料间的界面特性和加载速率。DIC方法是一种测试沥青混合料变形破坏规律实用而经济的方法。

Cracking is one of the early damage types for asphalt pavement, the bending fracturefeature about rubber powder modified asphalt mixture and normal asphalt mixture beam have beenstudied by the three--point bending beam test, the deformation and damage progress of asphalt mix-ture beam have been record by CCD, furthermore, the Digital Image Correlation （DIC） method hasused to study the displacement and deformation field of asphalt mixture beam in this article. The resultof the test shows that. the asphalt,boundary character between asphalt and aggregate,loading rate aresignificant factors affect asphalt mixture property. It is concluded DIC method is a practical and an eco-nomical method for studying the deformations of asphalt mixtures.