文献类型：期刊文献

英文题名：Microscopic insights into the rejuvenator-induced depolymerization of asphaltene aggregates in aged asphalt

作者：Deng, Mei Zhang, Wenli Gan, Xinli Cao, Xuejuan Tang, Boming Zhang, Xinqiang

通信作者：Cao, XJ[1];Zhang, XQ[2]

机构：[1]Guizhou Inst Technol, Sch Transportat Engn, Guiyang, Peoples R China;[2]Chongqing Jiaotong Univ, Natl & Local Joint Engn Lab Transportat & Civil En, Chongqing, Peoples R China;[3]Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Peoples R China

第一机构：贵州理工学院

通信机构：corresponding author), Chongqing Jiaotong Univ, Natl & Local Joint Engn Lab Transportat & Civil En, Chongqing, Peoples R China;corresponding author), Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Peoples R China.

年份：2025

卷号：494

外文期刊名：CONSTRUCTION AND BUILDING MATERIALS

收录：;EI(收录号：20253719127319);Scopus(收录号：2-s2.0-105015138626);WOS:【SCI-EXPANDED(收录号:WOS:001568488800001)】；

基金：This work was supported by Guizhou the Young Guidance Program of the Science and Technology (Program No. Qian Ke He Jichu QN [2025] 220), the National Natural Science Foundation of China (Program No. 52468061), and Guizhou Provincial Key Technology R&D Program (Program No. [2023] General 299).

语种：英文

外文关键词：Asphalt aging; Asphaltene aggregates; Rejuvenators; Depolymerization effect; Microscopic mechanism

摘要：Asphaltene aggregates depolymerization is a critical factor in aged asphalt rejuvenation, yet the impact of major rejuvenator components remains unclear due to asphaltenes' complex structure. Unlike previous simulation-based investigations, this study employs various characterization techniques to reveal asphaltene aggregate behaver during oxidative aging and the microscopic depolymerization mechanism and structure-activity relationships of 10 representative bio-based and petroleum-based rejuvenator compounds. The results revealed that oxidative aging increased the stacking density and order of aromatic layers within asphaltene aggregates and promoted O-H center dot center dot center dot O hydrogen bond formation. Additionally, oxidation reduced the critical micelle concentration of asphaltenes and caused fluorescence quenching, resulting in the development of dendritic three-dimensional aggregates with equidistant, layered, and porous structures. However, the introduction of rejuvenators disrupted the stacking of aromatic layers but had minimal impact on the arrangement of aliphatic chains. Rejuvenators containing heteroatoms further promoted depolymerization by forming hydrogen bonds with asphaltene molecules, reducing the aggregate size and producing more dispersed and irregular structures. The bio-rejuvenators with heteroatom functional groups exhibited superior depolymerization efficiency. This study provides mechanistic insights into rejuvenator-induced asphaltene depolymerization and establishing a foundational reference for the molecular design of efficient rejuvenators in recycled asphalt applications.