生物质组分在植物油再生沥青中的裂解脂化规律及老化机理

The recycled asphalt pavement technology is popular used in all over the world. However, the performance of the reclaimed asphalt mixture, such as temperature durability and water resistance, deteriorates quickly with high RAP content. The main reason is that the aged bitumen is not effective recovered by using the traditional mineral oils rejuvenator..The objective of this research is to determine the technological index and standard for the vegetable oils rejuvenator according to study on aging mechanism of recovered bitumen with vegetable oils rejuvenator under biomass components pyrolysis and esterification..Firstly, the weigh, heat capacity and composition of micro-components of recovered bitumen 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 bitumen will be evaluated..Secondly, the mass of quality, volume and distribution of asphaltene of recovered bitumen will be observed through micro analysis. Based on molecular thermal theory, the asphaltene interface action and the energy polarities will be analysis the reveals 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 bitumen, vegetable oil and the virgin/aged bitumen. Based on this model. The diffusion and mechanical response of recovered bitumen will be simulated by using molecular analysis program-Materials Studio to reveal the mechanism of bitumen micro structure 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 rejuvenator.

本课题针对植物油再生沥青技术中生物质组分易裂解酯化，再生沥青抗老化性能差的技术缺陷，就植物油再生沥青应用的基础问题——生物质组分在植物油再生沥青中的裂解酯化规律及老化机理展开研究。通过光谱分析和形态显微技术，掌握脂肪酸和多环芳烃等生物质组分基团组成及形态的变化规律，揭示生物质组分在老化沥青中的扩散及接枝共轭微观形态特征；通过差热分析、光谱及原子力显微技术，测定玻璃化温度、光谱谱带偏移和组分界面原子力，基于共混聚合物相容热力学和界面理论，揭示接枝共轭后生物质组分在植物油再生沥青中的裂解酯化规律；通过建立生物质组分老化与再生沥青微观结构之间的关系方程，对生物质组分与老化沥青的相容行为和接枝共轭增韧作用进行模拟，揭示植物油再生沥青抗老化的微观作用机理；基于长寿命路面理论，提出再生沥青的材料设计原则和植物油再生剂的选择判据，为利用地沟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技术储备。

本课题针对植物油再生沥青技术中生物质组分易裂解酯化，再生混合料抗老化性能差的技术缺陷，就植物油再生沥青老化规律及抗老化机理展开了研究。通过热分析（TA）和红外光谱分析（IR）等微观分析手段，研究了植物油与老化沥青混溶过程中生物质组分在老化沥青中的扩散过程，分析了植物油生物质组分特征、再生剂掺量、再生温度、再生发育时间等因素对生物质组分扩散过程的影响；并研究了植物油再生沥青在服役期的老化过程中组分组成变化，分析在短期老化、长期老化及紫外老化条件下，植物油再生沥青组分组成的变化及植物油生物质组分特征、再生剂掺量、再生温度、再生发育时间等因素对其的影响。采用热重、差热分析法，研究了生物质组分在植物油再生沥青中的抗老化机理；通过对玻璃化转换温度、混合自由能、相分离度、沥青质体积及分布状态等相容性和形态特征指标的确定，研究了植物油组分在泡沫沥青与旧集料界面结合过程中的增黏机理。