Understanding progressive aging of bitumen-rubber composite binder and its separate phases considering biphase interactions

IF 3.4 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Materials and Structures Pub Date : 2024-09-05 DOI:10.1617/s11527-024-02449-0

Tao Wang, Jiaxu Ma, Jie Ma, Xiaopei Cai, Yaping Cui, Ruilin Ning, Jin Li

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Abstract

Bitumen-rubber composite binder (BRCB) has great potential to construct durable road pavement infrastructures that can withstand the environmental aging. However, the aging behavior of BRCB has not been fully investigated so far, especially from the perspective of biphase system with the phase interactions consideration. Therefore, this study investigated the progressive aging behavior of BRCB in terms of separate bitumen phase and rubber phase as well as the biphase interactions, to further understand the mechanisms behind. The results showed that the bitumen phase gradually dominated rheological performance of BRCB with the progressive aging. On the contrast, the fatigue resistance of BRCB was constantly controlled by its rubber phase in the aging process. Secondly, the rubber phase gradually dissolved during the aging with a decrease in the crosslinking density, although the change rate slowed down with the aging duration. The breakdown pattern of rubber structure was further identified as the simultaneous scission of crosslinking bonds and main chains. Besides, biphase interactions during progressive aging primarily included the absorption of light components from bitumen phase into rubber phase and the release of long rubber molecular chains and fillers from rubber phase into bitumen phase. Overall, the progressive aging of BRCBs can be considered as the combined effect of the secondary bitumen-rubber biphase interactions after the first-stage production and thermal oxidation of the bitumen phase.

Graphical abstract

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考虑双相相互作用，了解沥青-橡胶复合粘结剂及其各相的渐进老化过程

沥青橡胶复合粘结剂（BRCB）在建造耐环境老化的耐用路面基础设施方面具有巨大潜力。然而，迄今为止，人们尚未对沥青橡胶复合材料的老化行为进行全面研究，特别是从考虑相位相互作用的双相系统角度进行研究。因此，本研究分别从沥青相和橡胶相以及双相相互作用的角度研究了 BRCB 的渐进老化行为，以进一步了解其背后的机理。结果表明，沥青相逐渐主导了 BRCB 的流变性能。相反，在老化过程中，BRCB 的抗疲劳性能始终受其橡胶相的控制。其次，橡胶相在老化过程中随着交联密度的降低而逐渐溶解，但变化速度随着老化时间的延长而减慢。橡胶结构的破坏模式进一步确定为交联键和主链的同时断裂。此外，渐进老化过程中的双相相互作用主要包括轻组分从沥青相吸收到橡胶相，以及长橡胶分子链和填料从橡胶相释放到沥青相。总的来说，BRCB 的渐进老化可视为第一阶段生产和沥青相热氧化后二次沥青-橡胶双相作用的综合效应。

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来源期刊

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.