内蒙古西部环境及荷载作用下温拌胶粉改性沥青细观断裂行为研究

温拌胶粉改性沥青对于节能环保、废物利用及提高路面质量具有重要意义。沥青的抗裂性能是影响路面抗裂性的重要因素。本项目针对内蒙古西部地区温拌胶粉改性沥青路面在冻融循环、除冰盐侵蚀、光氧复合老化等环境因素及荷载作用下的开裂问题，基于化学分析和细观力学原理，以沥青为研究对象，通过化学分析研究环境及荷载作用下沥青的化学组成特性；通过扫描电镜、原子力显微镜和纳米压痕实验研究沥青细观结构特征、粘附特性和微观硬度及模量变化；通过数字图像相关方法测量沥青裂纹萌生、扩展及断裂粘结退化过程中应变分布规律，基于应变、应力变化描述沥青细观损伤程度，建立沥青粘结损伤演化方程；基于沥青细观力学性能和细观结构特征研究沥青粘结退化、断裂特性，探索沥青细观结构损伤与粘结退化、断裂行为间相关关系，揭示温拌胶粉改性沥青粘结退化、断裂机理。该项目既有地区特点，同时对于深入了解温拌胶粉改性沥青宏细观力学行为和研究方法具有重要意义。

Warm mix crumb rubber modified asphalt have an important meaning for energy conservation, environment protection, waste materials utilization and pavement quality improvement. The anti-cracking ability of asphalt is a key factor which affects the pavement crack resistance ability. This project aims at the crack of bituminous pavement under freezing-thawing cycle, deicing salt erosion，light oxygen compound aging and load in west Inner Mongolia. The asphalt is studied on the basis of polymer chemistry and mesomechanics theory. The chemical composition characteristics of asphalt under environment and load is analyzed. The microstructure feature, cohesive characteristics, micro-hardness and modulus change rule of asphalt is explored based on scanning electron microscope, atomic force microscope and nanoindentation tests. The digital image correlation method is used to measure the strain distribution of asphalt in the process of crack emerge,expansion and fracture as well as bond degradation. The microscopic damage degree is described and the damage equation of asphalt is established based on the changing of strain and stress. It analyzes the bond degradation and fracture performances on the basis of the mesoscopic mechanical properties and the microstructure feature of asphalt. In addition, it explores the correlation between the bond degradation, fracture and damage of microstructure, and tries to find out the bond degradation and fracture mechanism of asphalt. The project has local perspectives, and in the meantime, it has importance in deeper understanding the warm mix crumb rubber modified asphalt mechanical behaviors on both macro and micro scope，as well as research methods.