沥青混合料单轴重复加卸载内部结构分析  

Internal structure of asphalt mix with X-ray computerized tomograph under repetitive uniaxial loading

作　　者：李晓军[1] 张肖宁[1] 武建民[2] 

机构地区：[1]华南理工大学交通学院,广东广州510640 [2]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064

出　　处：《长安大学学报（自然科学版）》2004年第4期14-17,共4页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(50078023)

摘　　要：利用可同步进行CT(ComputerizedTomograph)扫描的三轴仪,进行了沥青混合料单轴重复加、卸载实验。根据CT数和CT图像分析了加、卸载过程中,沥青混合料内部结构和密度的变化。计算了不同加、卸载阶段的损伤因子和结构系数。结果表明:加载初期损伤因子略有减小,属于压密阶段;随加、卸载的进行,损伤逐渐加大,而且试件内部损伤的演化、发展与试件空隙分布密切相关。The repetitive uniaxial loading compression tests are conducted with a new set of modified triaxial compression apparatus, which made the asphalt mixture samples can be scanned with Computerrized Tomograph (CT) during different loading process. With the test results, the internal structures of asphalt mixture sample of different stages are analyzed from CT numbers and CT images. The damage factors and structural coefficients are calculated. The test results show that the inital damage factors decrease at the beginning of loading and increase with the increasement of different loadings, and the evaluation and development of inner damage of asphalt mix sample are strongly influenced by the distribution of air voids in the sample.

关 键 词：道路工程 沥青混合料 内部结构 CT 加载 

分 类 号：U414.75[交通运输工程—道路与铁道工程]