Mechanistic insights into the colloidal co-assembly of deeply degraded tire rubber and asphalt binder

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

Construction and Building Materials Pub Date : 2025-10-07 DOI:10.1016/j.conbuildmat.2025.143935

Shanshan Wang , Zhijun Li , Shifeng Wang

{"title":"Mechanistic insights into the colloidal co-assembly of deeply degraded tire rubber and asphalt binder","authors":"Shanshan Wang , Zhijun Li , Shifeng Wang","doi":"10.1016/j.conbuildmat.2025.143935","DOIUrl":null,"url":null,"abstract":"<div><div>The co-colloidal architecture synthesized from deeply degraded tire rubber (DR) and asphalt binder confers exceptional stability to the composite system. While the colloidal organization of asphalt binder has been extensively characterized and scientifically validated, the mechanistic role of DR in modulating colloidal structural evolution remains a critical knowledge gap in interfacial material science. In this study, DR was separated into sol (DRS) and gel (DRG) phases, and their individual interfacial interactions with asphalt binder were investigated. Molecular dynamics simulations, contact angle measurements, thermogravimetric analysis, attenuated total reflectance Fourier transform infrared spectroscopy, Raman spectroscopy, and dynamic mechanical analyzer were employed to evaluate the physicochemical properties of DRS, DRG and different asphalts. Furthermore, the microstructure of the colloids was analyzed via atomic force microscopy (AFM) and optical microscopy (OM). The interactions between DRS and asphalt during compounding are attributed to their identical polarity and minimal solubility parameter differences (Δδ<1 (J/cm<sup>3</sup>)<sup>0.5</sup>). Strong interfacial adsorption and reactive bonding significantly altered the dispersion and interaction of DRG with asphalt binder. The performances of rubberized asphalt exhibited non-linear behavior beyond linear superposition of DRS modified asphalt and DRG modified asphalt characteristics, reflecting complex multiphase interactions between DR and asphalt colloids. Finally, based on AFM and OM observations, colloidal structures were proposed for the modified asphalts. These observations revealed the presence of characteristic bee-like structures in BA and DRSMA, but not in DRMA or DRGMA.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"497 ","pages":"Article 143935"},"PeriodicalIF":8.0000,"publicationDate":"2025-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Construction and Building Materials","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0950061825040863","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}

引用次数: 0

Abstract

The co-colloidal architecture synthesized from deeply degraded tire rubber (DR) and asphalt binder confers exceptional stability to the composite system. While the colloidal organization of asphalt binder has been extensively characterized and scientifically validated, the mechanistic role of DR in modulating colloidal structural evolution remains a critical knowledge gap in interfacial material science. In this study, DR was separated into sol (DRS) and gel (DRG) phases, and their individual interfacial interactions with asphalt binder were investigated. Molecular dynamics simulations, contact angle measurements, thermogravimetric analysis, attenuated total reflectance Fourier transform infrared spectroscopy, Raman spectroscopy, and dynamic mechanical analyzer were employed to evaluate the physicochemical properties of DRS, DRG and different asphalts. Furthermore, the microstructure of the colloids was analyzed via atomic force microscopy (AFM) and optical microscopy (OM). The interactions between DRS and asphalt during compounding are attributed to their identical polarity and minimal solubility parameter differences (Δδ<1 (J/cm³)^0.5). Strong interfacial adsorption and reactive bonding significantly altered the dispersion and interaction of DRG with asphalt binder. The performances of rubberized asphalt exhibited non-linear behavior beyond linear superposition of DRS modified asphalt and DRG modified asphalt characteristics, reflecting complex multiphase interactions between DR and asphalt colloids. Finally, based on AFM and OM observations, colloidal structures were proposed for the modified asphalts. These observations revealed the presence of characteristic bee-like structures in BA and DRSMA, but not in DRMA or DRGMA.

查看原文本刊更多论文

深度降解轮胎橡胶和沥青粘结剂胶态共组装的机理研究

由深度降解轮胎橡胶（DR）和沥青粘合剂合成的共胶体结构为复合体系提供了卓越的稳定性。虽然沥青粘合剂的胶体组织已经被广泛表征和科学验证，但DR在调节胶体结构演变中的机制作用仍然是界面材料科学中的一个关键知识缺口。在这项研究中，DR被分离成溶胶（DRS）和凝胶（DRG）相，并研究了它们与沥青粘合剂的单独界面相互作用。采用分子动力学模拟、接触角测量、热重分析、衰减全反射傅立叶变换红外光谱、拉曼光谱和动态力学分析仪对DRS、DRG和不同沥青的理化性质进行了评价。通过原子力显微镜（AFM）和光学显微镜（OM）对胶体的微观结构进行了分析。DRS和沥青在复合过程中的相互作用归因于它们具有相同的极性和最小的溶解度参数差异（Δδ<1 (J/cm3)0.5）。强界面吸附和反应键作用显著改变了DRG与沥青粘结剂的分散和相互作用。橡胶改性沥青的性能表现出超出DRS改性沥青和DRG改性沥青线性叠加特性的非线性行为，反映了DR与沥青胶体之间复杂的多相相互作用。最后，基于AFM和OM观察，提出了改性沥青的胶体结构。这些观察结果表明BA和DRSMA中存在典型的蜜蜂样结构，而DRMA和DRGMA中没有。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

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.