{"title":"Adhesion behavior and microscopic mechanism of epoxy asphalt-RAP aggregate interface","authors":"Zhiyong Shi , Zhaohui Min , Fei Chen , Wei Huang","doi":"10.1016/j.conbuildmat.2024.139361","DOIUrl":null,"url":null,"abstract":"<div><div>The utilization of thermosetting epoxy asphalt shows promise in achieving the objective of efficient recycling of reclaimed asphalt pavement (RAP) and promoting the sustainable development of pavement engineering. However, the adhesion behavior and microscopic mechanism of the multi-phase complex interface of epoxy asphalt-RAP aggregate is not clear, which is not conducive to the application of epoxy asphalt in RAP. In this paper, epoxy asphalt-aged asphalt (EA)-aggregate specimens were prepared to simulate the epoxy asphalt-RAP aggregate interface. The effects of different factors on adhesion performance indicators such as surface performance, shear performance and dynamic mechanical performance of the interface were evaluated. The grey relation analysis was used to clarify the sensitivity of interface adhesion performance indicators to different factors. Finally, the microscopic mechanism of interface adhesion behavior was revealed. The results showed that the increase in the epoxy component content and the degree of blending (DOB) of the EA improved the surface characteristics, shear performance, and dynamic mechanical performance of the interface, contributing to interface tends to adhesion failure, which was contrary to the aging effect of asphalt and water immersion. Noteworthy, adding the epoxy component exacerbated the gradient distribution of the EA with partial blending, and the enhancement effect on the interface deformability was significantly weakened. Especially for the range of shear strain growth rate of the EA-30P-granite interface decreased to 15.21 %∼27.61 %. Besides, the adhesion performance of the interface with different aggregates showed a similar pattern. The surface characteristics and dynamic mechanical performance of the interface were more sensitive to aggregate type and DOB, while the top-ranking influencing factors were epoxy component content and DOB for interface shear performance. Increasing the epoxy component content and DOB contributed to the integrity of the microstructural morphology of the epoxy component, but the aging of asphalt had the opposite pattern.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"457 ","pages":"Article 139361"},"PeriodicalIF":8.0000,"publicationDate":"2024-11-29","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/S0950061824045033","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 utilization of thermosetting epoxy asphalt shows promise in achieving the objective of efficient recycling of reclaimed asphalt pavement (RAP) and promoting the sustainable development of pavement engineering. However, the adhesion behavior and microscopic mechanism of the multi-phase complex interface of epoxy asphalt-RAP aggregate is not clear, which is not conducive to the application of epoxy asphalt in RAP. In this paper, epoxy asphalt-aged asphalt (EA)-aggregate specimens were prepared to simulate the epoxy asphalt-RAP aggregate interface. The effects of different factors on adhesion performance indicators such as surface performance, shear performance and dynamic mechanical performance of the interface were evaluated. The grey relation analysis was used to clarify the sensitivity of interface adhesion performance indicators to different factors. Finally, the microscopic mechanism of interface adhesion behavior was revealed. The results showed that the increase in the epoxy component content and the degree of blending (DOB) of the EA improved the surface characteristics, shear performance, and dynamic mechanical performance of the interface, contributing to interface tends to adhesion failure, which was contrary to the aging effect of asphalt and water immersion. Noteworthy, adding the epoxy component exacerbated the gradient distribution of the EA with partial blending, and the enhancement effect on the interface deformability was significantly weakened. Especially for the range of shear strain growth rate of the EA-30P-granite interface decreased to 15.21 %∼27.61 %. Besides, the adhesion performance of the interface with different aggregates showed a similar pattern. The surface characteristics and dynamic mechanical performance of the interface were more sensitive to aggregate type and DOB, while the top-ranking influencing factors were epoxy component content and DOB for interface shear performance. Increasing the epoxy component content and DOB contributed to the integrity of the microstructural morphology of the epoxy component, but the aging of asphalt had the opposite pattern.
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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.
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