多功能LDH-SBS复合材料的可控组装及其对沥青抗老化增强作用机理研究

SBS改性沥青（SMB）受环境影响易发生老化，导致沥青路面服役寿命缩短。SMB老化是由沥青的热氧和光氧老化及SBS的老化降解共同作用的，只针对单一方面的防老化，难以有效地提高SMB抗老化能力。本项目基于LDH结构特性对其进行功能化设计，并将功能化LDH与SBS进行化学组装制备出多功能LDH-SBS复合材料用于沥青改性，以改善二者在沥青中相容稳定性，提高SBS的抗老化降解性能，增强沥青的抗热氧和光氧老化能力。研究改性剂和制备工艺对复合材料结构与性能的影响，建立改性剂-工艺条件-抗老化降解性能间的关系，阐明不同功能化LDH与SBS间的相互作用机制及抗老化降解机理，优化组装设计，实现多功能LDH-SBS复合材料可控组装；探明LDH-SBS复合材料改性沥青在老化过程中性能、组分和结构的变化规律，揭示LDH-SBS复合材料对沥青抗老化增强作用机理，为制备抗老化性能优异的SMB提供技术支持和理论指导。

SBS modified bitumen (SMB) is susceptible to aging under the effect of the external environment, which results in conspicuously shortening the service life of bitumen pavement. The aging of SMB is determined by the thermo-oxidative and photo-oxidation aging of bitumen and the degradation of SBS, only for one aspect of anti-aging can not effectively improve the anti-aging ability of SMB. This project is based on the structural property of LDH to functional modification, and functional LDH and SBS will be chemically assembled as multifunctional LDH-SBS composite material to modify bitumen, which is conducive to ameliorate the consistency and stability of LDH and SBS in bitumen, improve the anti-degradation of SBS, enhance the thermo-oxidative and photo-oxidation aging of bitumen. The effect of modifier and preparing technology on the structure and performance of LDH-SBS composite material will be studied, the relationship between modifier, technological conditions and anti-aging degradation property of LDH-SBS composite material will be established. The interaction mechanisms between functional LDH and SBS, and the anti-aging degradation mechanism of LDH-SBS composite material will be revealed. The assembly design will be optimized to realize controllable assembly of multifunctional LDH-SBS composite material. The variation rules of the performance, component and structure of LDH-SBS composite material modified bitumen during aging will be ascertained. The strengthening mechanism of LDH-SBS composite material on the aging resistance of bitumen will be illuminated, which is used to provide the theoretical guidance and technical support for SMB with excellent aging resistance.