| 摘要: |
| 用微米划痕试验联合扫描电镜技术，分析了室温下沥青混合料界面过渡区（ITZ）的特性，推定了ITZ区域空间几何范围，测试了其断裂韧度及摩擦系数，并采用三点弯曲试验及纳米压痕试验进行了对比验证.结果表明：沥青混合料ITZ区域特性明显，荷载为100 mN时更适用于微米划痕试验，此时ITZ区域在划痕作用下会出现较大破裂面，且其厚度在10~30 μm波动，与纳米压痕试验结果相近；ITZ摩擦系数由集料至沥青胶浆呈线性增加，达到最大值后趋于稳定；微米划痕试验测得的断裂韧度值与三点弯曲试验结果相近，且断裂韧度曲线可以较好地识别集料、ITZ和沥青胶浆三相介质，微米划痕试验可以相对简便有效地实现沥青混合料ITZ初步分析. |
| 关键词: 沥青混合料 界面过渡区 微米划痕 电镜扫描 微观力学参数 |
| DOI：10.3969/j.issn.1007-9629.2023.01.011 |
| 分类号:U416.27 |
| 基金项目:国家自然科学基金资助项目（51978548） |
|
| Micro-scratch Test and Parameter Analysis of Asphalt Mixture Interfacial Transition Zone |
|
FU Jun1,2, XIONG Dingbang1, LI Zhongjie1, DING Qingjun2, JIA Dawei1
|
|
1.School of Transportation & Shipping， Wuhan University of Technology， Wuhan 430063， China;2.State Key Laboratory of Silicate Materials for Architectures， Wuhan University of Technology， Wuhan 430063， China
|
| Abstract: |
| The interfacial transition zone （ITZ） of asphalt mixture at room temperature was analyzed by micro-scratch test combined with scanning electron microscopy （SEM）. The spatial geometric range of ITZ was deduced， and the fracture toughness and friction coefficient were determined. Three-point bending test and nano-indentation test were used for comparative verication. The results show that the ITZ region of asphalt mixture has clear characteristics， and when the load is 100 mN， it is more suitable for the micro-scratch test. Under the scratch effect， a large fracture surface will appear in the ITZ region， and the thickness fluctuates between 10-30 μm， which is similar to the results of nanoindentation test. ITZ friction coefficient increases gradualy from aggregate to asphalt mortar， and tends to be stable after reaching the maximum value. The fracture toughness value obtaind by micro-scratch test is close to the three-point bending test result， and the three-phase medium of aggregate， ITZ and asphalt mortar can be better identified from the fracture toughness curve， indicating that the preliminary analysis of asphalt mixture ITZ can be easily realized by micro-scratch test. |
| Key words: asphalt mixture interface transition zone micro-scratch scanning electron microscopy micro-mechanical parameter |
