温拌再生混合料新-旧沥青界面相容渗透行为研究

Warm mix recycling technology of asphalt pavement has poor compatible permeability between the new and old asphalt, and low utilization rate of RAP, which seriously restricts the popularization and application of regeneration technology. The good compatibility between the new and old asphalt can improve the utilization ratio of RAP old asphalt, increase the content of RAP, and improve the performance of recycled asphalt mixture. . The interface compatibility between the new and old asphalt is taken as the research object, using the warm mix regeneration method as the main line. The permeability model of new - old asphalt is constructed in warm mix conditions from the micro scale. This will reveal the physical and chemical permeation process of the new and old asphalt interface, and provide theoretical support for preparation of compatible penetrants. The permeation process of compatible penetrants and diffusion factors are quantified by the atomic force microscopy. The compatibility between compatible penetrants and the interface of new-old asphalt is studied by the chemical analysis technology to explore the mechanism of compatibility and diffusion of new-old asphalt. Based on the theory of compatible diffusion and surface energy, these are constructed that the compatible percolation model and the adhesion model. And the effect and improvement of compatible penetrants and warm mix agents on the performance of warm mix recycled asphalt mixture is systematically studied. The results of this study can effectively improve the interface morphology of new-old asphalt and the performance of warm mix recycled asphalt mixture, and achieve the purpose of increasing the RAP content.

沥青路面温拌再生技术中新-旧沥青相容渗透性差，RAP利用率低，严重制约了再生技术的推广应用。新-旧沥青界面良好的相容性可提高RAP旧沥青的利用率，增加RAP掺量，改善再生沥青混合料的路用性能。. 本课题以新-旧沥青界面相容渗透为研究对象，以温拌再生为主线，从微细观尺度构建温拌条件下新-旧沥青的渗透模型，揭示新-旧沥青界面的物理、化学渗透过程，为相容渗透剂制备提供理论支撑。运用原子力显微镜量化相容渗透剂对新-旧沥青界面相容渗透过程及渗透扩散影响因素，采用化学分析技术，深入研究相容渗透剂与新-旧沥青界面的相容性，探索新-旧沥青相容渗透扩散机制。基于相容渗透扩散理论和表面能理论，构建新-旧沥青相容渗透模型和黏附模型，系统研究相容渗透剂、温拌剂对温拌再生沥青混合料性能影响和改善效果。研究成果将有效改善新-旧沥青界面形态和温拌再生沥青混合料性能，并达到提高RAP掺量的目的。

新-旧沥青界面良好的相容性可提高RAP旧沥青的利用率，增加RAP掺量，改善再生沥青混合料的路用性能。本课题通过化学分析手段，结合分子示踪技术，探索温拌条件下新-旧沥青在扩散中的分子重构行为，追踪沥青分子迁移深度与影响范围和RAP沥青膜软化后新沥青的迁移深度。基于新-旧沥青渗透扩散尺度，按照组分调节理论选用原料制备渗透型相容剂，实现温拌条件激发RAP表面的沥青膜促使新-旧沥青的融合，提高再生沥青混合料的利用率及RAP掺量；通过正交试验，确定了相容渗透剂的优化配比，评价相容渗透剂的抗老化性、热稳定性以及扩散渗透性，运用原子力显微镜技术，采用竖向叠加和水平扩散模型，分析新-旧沥青界面形态作用机制。基于表面能理论构建了黏附模型评价再生沥青与集料的黏附性能，系统研究相容渗透剂、温拌剂对温拌再生沥青混合料性能影响和改善效果。研究成果为提高RAP掺量及改善温拌再生沥青混合料性能提供理论依据和技术支撑。