不同分子结构柔性活化剂对SBS改性沥青紫外老化性能的实验室评价

IF 8 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-04-13 DOI:10.1016/j.conbuildmat.2025.141246

Xiaobin Han , Xirong Niu , Zhuang Zhang , Zhilong Cao , Ruiyang Wang , Zhengang Feng , Jianying Yu

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引用次数: 0

摘要

活性柔性再生剂通过重建老化SBS交联结构实现了老化SBS改性沥青（SMB）的高质量再生，同时还加入了沥青组分还原剂（芳香油，AO）。然而，具有不同分子结构的活性柔性返老还老剂对再生sbs改性沥青的紫外线（UV）辐射耐久性的影响尚不清楚，因此无法评估这些返老还老剂的长期有效性。在本研究中，使用不同分子结构和AO的活性柔性返老还老剂对衰老的SMB进行复合再生。随后，对再生的SMB进行紫外线老化。通过与仅用AO再生的SMB进行比较，研究了不同分子结构的活性柔性返老还老剂对再生SMB紫外线老化性能的影响。FTIR结果表明，活性柔性恢复剂重建的SBS交联结构在UV老化过程中持续降解和断裂。这一过程消耗了紫外线辐射能量和氧气，从而部分抑制了再生沥青的氧化缩聚。SARA组分分析表明，活性柔性返老还老剂通过重建老化的SBS交联结构，减缓了紫外老化过程中轻组分的挥发和氧化缩合速率。活性柔韧性恢复剂的掺入减轻了再生的SMB在紫外线辐射下的物理和流变特性的恶化。与单独使用沥青组分还原剂相比，活性柔性返老还老剂能够通过重建老化SBS的交联结构来增强经过再生的SMB的抗老化能力。活性柔性返老还老剂在提高SMB再生过程中抗老化能力方面的效果不同，这是由于它们的分子结构对紫外线辐射的敏感性不同。本研究为活性柔韧性回春剂分子结构的优化提供了数据支持。

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Laboratory evaluation of ultraviolet aging performance of regenerated SBS modified bitumen based on active flexible rejuvenators with different molecular structures

Active flexible rejuvenators achieved high-quality regeneration of aged SBS modified bitumen (SMB) by reconstructing the aged SBS cross-linked structure while also an incorporating bitumen component reducing agent (aromatic oil, AO). However, the impact of active flexible rejuvenators with different molecular structures on the ultraviolet (UV) radiation durability of regenerated SBS-modified bitumen remains unclear, making it impossible to evaluate the long-term effectiveness of these rejuvenators. In this study, aged SMB was subjected to composite regeneration using active flexible rejuvenators with different molecular structures and AO. Subsequently, the regenerated SMB was subjected to UV aging. By comparing it with SMB regenerated with only AO, the influence of active flexible rejuvenators with different molecular structures on the UV aging properties of the regenerated SMB was investigated. FTIR results revealed that the SBS cross-linked structure, which had been reconstructed by the active flexible rejuvenators, underwent continued degradation and breakage during UV aging. This process consumed UV radiation energy and oxygen, thereby partly inhibiting the oxidative condensation of the regenerated bitumen. The SARA fractions analysis indicated that active flexible rejuvenators could slow down the volatilization of light components and their rate of oxidative condensation during UV aging by reconstructing the aged SBS cross-linked structure. The incorporation of active flexible rejuvenators mitigated the deterioration of the physical and rheological properties of the regenerated SMB subjected to UV radiation. When utilized in comparison to solely employing bitumen component reducing agents, active flexible rejuvenators were capable of bolstering the aging resistance of SMB that had underwent regeneration by reconstructing the cross-linked structures of aged SBS. The effectiveness of active flexible rejuvenators in enhancing the aging resistance of SMB during regeneration varies, owing to their differing sensitivities to ultraviolet radiation based on their molecular structures. This study offered data support for optimizing the molecular structure of active flexible rejuvenators.

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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.