植物油分对沥青质沉淀干扰及沥青结构重塑影响的微观机理研究

本课题针对矿物油再生沥青技术中有效再生沥青量低，混合料抗老化性能及耐久性差的技术缺陷，就植物油再生沥青的基础问题--植物油分对沥青质沉淀干扰及沥青结构重塑影响的微观机理展开研究。通过热分析和光谱分析技术，掌握植物油再生沥青过程中，各微观组分基团热重、热容及组成的变化规律，揭示植物油分对沥青组分组成结构影响的微观机理；通过显微分析技术观测沥青质的质量、体积及分布状态，基于分子热力学理论分析沥青质界面行为及能量极性的演变规律，揭示植物油分对沥青质沉淀干扰的微观机理；通过建立再生沥青微观结构与植物油分及新旧沥青微观结构之间的分子扰动力学模型，对植物油分在新旧沥青混溶物中的相溶行为和力学响应进行模拟，揭示植物油分对新旧沥青结构重塑影响的影响机理；在平衡考虑宏观路用性能的基础上，提出植物油基再生剂的开发原则和选择判据，为利用废弃植物油开发再生剂奠定基础，为植物油再生沥青技术的推广提供基础的技术储备。

The Hot Recycled Asphalt Pavement (HRAP) technology is popular used in all over the world. However, the properties of the materials, such as aging resistance and durability, deteriorates quickly with increasing the reclaimed asphalt pavement content. The main reason is that the aged binder is not effective recovered by using the traditional mineral oils regeneration agent. The objective of this research is to determine the technological index and standard for the vegetable oils regeneration agent according to study on the mechanism of asphaltene diffusion and bitumen microstructure recombination. Firstly, the weight, heat capacity and composition of micro-components of recovered binder will be recorded by using thermo gravimeter (TG), differential thermal analysis (DTA) and infrared spectrometric analyzer (ISA). The effect of vegetable oils types and proportion of recovered binder will be discussed. Secondly, the mass of quality, volume and distribution of asphaltene of recovered binder will be observed through micro analysis. Based on molecular thermal theory, the asphaltene interface actions and the energy polarities will be analysis to reveal the micro-effect mechanism of asphaltene diffusion with vegetable oils. Finally, a developed molecular disturbance mechanical model will be established among micro-structure of recovered binder, vegetable oil and the virgin/aged binder. Base on this model, the diffusion and mechanical response of recovered binder will be simulated by using molecular analysis program-Materials Studio 5.0 to reveal the mechanism of bitumen microstructure recombination with vegetable oils. Then, A serials of laboratory materials properties testing will be conducted to establish the design principles and select criterion for vegetable oils rejuvenation agent.