基于原子力显微镜技术的温拌沥青与集料体系粘附性的微观机理研究

温拌沥青混合料（WMA）是一种节能减排的绿色筑路材料，其降低施工温度的技术特点使其水稳定性受到了很大的挑战，然而，温拌沥青与集料体系粘附性的微观机理尚未明确，成为制约该项技术推广应用的主要瓶颈。本项目利用原子力显微镜技术（AFM），以温拌沥青微观结构特征及其粘附力和粘聚力的定量描述为研究对象，对温拌沥青与集料体系粘附性的微观机理进行基础科学研究。具体内容包括：构建温拌沥青AFM图像扫描和力谱试验方法；采用力谱试验从纳米尺度定量表征干湿条件下温拌沥青与集料体系的粘附力与粘聚力；结合温拌沥青微观结构形态及其不同区域的粘附力分布特征分析温拌沥青微观结构对其粘附性的影响机制。本项目旨在揭示不同条件下温拌沥青的微观结构分布规律及其对沥青粘附力和粘聚力的影响机理，为客观评价WMA的水稳定性提供理论与实验依据，对有效控制WMA水损害具有重要的理论意义与参考价值。

Warm mix asphalt (WMA) is a green pavement construction material which is helpful to energy saving in addition to minimizing the emission of greenhouse gas. There is a greater challenge for its moisture susceptibility because the construction temperature is cut down. However, microscopic mechanism of adhesion in warm asphalt and aggregate system is not yet clear. It has become the main restrict bottlenecks to popularize and apply this technology. The basic scientific research on microscopic mechanism of adhesion in warm asphalt and aggregate system will be carried out by atomic force microscopy technique (AFM) based on the microstructure characteristic and quantitative description of adhesive forces and cohesive forces. There are three main themes in the project. Firstly, test methods will be developed in AFM image scanning and force spectrum experiments for warm asphalt. Secondly, adhesive & cohesive force in warm asphalt and aggregate system will be determined quantitatively in dry and wet conditions by force spectroscopy experiments. Finally, the effect mechanisms of microstructure distribution on adhesive forces and cohesive forces in warm asphalt and aggregate system will analyzed based on the microstructure shape in warm asphalt and adhesion distribution characteristics in different regions of morphology. The project aims to reveal influence mechanism of microstructure distribution in warm asphalt on adhesive & cohesive force in warm mix asphalt and aggregate system. It can provide theoretical and experimental evidence to evaluate objectively moisture susceptibility of WMA. And it is has important theoretical significance and reference value to control effectively moisture damage for WMA.