Investigation on all-component rejuvenation mechanism of bio-oil and epoxy compound in aged SBS modified bitumen

IF 8.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2026-04-11 Epub Date: 2026-03-11 DOI:10.1016/j.conbuildmat.2026.145900

Song Xu , Xiangjie Niu , Shilong Pan , Guoxiang Li , Shuai Yang , Lei Fang , Zhilong Cao , Hongyan Ma , Xiaojuan Jia

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引用次数: 0

Abstract

The success of all-component rejuvenation of aged SBS modified bitumen (SMB) hinges on the effective synergy between conventional and reactive rejuvenators. However, distribution, diffusion, and interaction pathways of the two types of rejuvenators within aged SMB may interfere with each other, which could compromise rejuvenation effectiveness and have not been thoroughly investigated to date. In order to investigate the synergistic mechanism between reactive and conventional rejuvenators, a composite reactive rejuvenator consisting of bio-oil and the epoxy compound was developed, and five rejuvenation strategies were proposed. The effectiveness of each strategy was evaluated through the physical property test, toughness test, and rheological test. Moreover, the rejuvenation mechanism and synergistic interaction pathways were explored using Fourier transform infrared spectroscopy and fluorescence microscopy tests. Results show that bio-oil helps restore the component balance of aged SMB but cannot repair broken SBS, whereas 1,6-hexanediol diglycidyl ether (HDE) is capable of chemically reconstructing the SBS network structure. As for the composite rejuvenation strategy involving HDE and bio-oil, bio-oil interferes with HDE effectiveness on degraded SBS. On one hand, bio-oil contains active compounds that engage in reactions with degraded SBS, on the other hand, they compete with degraded SBS to react with the epoxy compound. This interference significantly diminishes the effect of HDE on broken SBS and the crosslinking density of reconstructed SBS network structure, which results in decreased ductility, toughness, and high-temperature rutting resistance of rejuvenated SMB. It is imperative that the epoxy compound undergo complete reaction with degraded SBS beforehand to prevent interference caused by bio-oil, which eliminates potential active sites susceptible to reaction with bio-oil. These findings support a well-founded theoretical perspective and provide essential practical insights for the design of reactive rejuvenation strategies and the enhancement of effectiveness.

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老化SBS改性沥青中生物油和环氧复合物全组分年轻化机理的研究

SBS改性沥青全组分返老还衰的成功与否取决于常规返老还衰剂和活性返老还衰剂之间的有效协同作用。然而，两种类型的返老还童剂在衰老的SMB中的分布、扩散和相互作用途径可能相互干扰，从而影响返老还童的效果，迄今尚未得到充分的研究。为探讨活性型和常规型回春剂的协同增效机理，研制了一种由生物油和环氧化合物组成的复合活性型回春剂，并提出了5种回春策略。通过物理性能测试、韧性测试和流变学测试来评估每种策略的有效性。利用傅里叶变换红外光谱和荧光显微镜实验，探讨了复嫩机理和协同作用途径。结果表明，生物油有助于恢复老化的SMB的组分平衡，但不能修复断裂的SBS，而1,6-己二醇二缩水甘油醚（HDE）能够化学重建SBS的网络结构。对于含有HDE和生物油的复合年轻化策略，生物油会干扰HDE对降解SBS的效果。生物油一方面含有与降解SBS发生反应的活性化合物，另一方面又与降解SBS竞争与环氧化合物发生反应。这种干扰显著减弱了HDE对SBS断裂和重建SBS网络结构交联密度的影响，导致再生SMB的延展性、韧性和高温车辙抗力下降。为了防止生物油的干扰，环氧化合物必须事先与降解SBS完全反应，从而消除易与生物油反应的潜在活性位点。这些发现支持了一个有充分根据的理论观点，并为设计反应性年轻化策略和提高有效性提供了重要的实践见解。

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.