Adhesion behavior and microscopic mechanism of epoxy asphalt-RAP aggregate interface

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2024-11-29 DOI:10.1016/j.conbuildmat.2024.139361

Zhiyong Shi , Zhaohui Min , Fei Chen , Wei Huang

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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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环氧沥青- rap骨料界面黏附性能及微观机理

热固性环氧沥青的应用有望实现再生沥青路面的高效循环利用，促进路面工程的可持续发展。然而，环氧沥青-RAP骨料多相复合界面的粘附行为和微观机理尚不清楚，不利于环氧沥青在RAP中的应用。本文通过制备环氧沥青老化沥青(EA)-骨料试件，模拟环氧沥青- rap骨料界面。评价了不同因素对界面表面性能、剪切性能和动态力学性能等粘附性能指标的影响。采用灰色关联分析，明确了界面附着性能指标对不同因素的敏感性。最后，揭示了界面粘附行为的微观机理。结果表明：环氧组分含量和EA共混度（DOB）的增加改善了界面的表面特性、剪切性能和动态力学性能，导致界面趋于粘附破坏，与沥青和水浸泡的老化作用相反；值得注意的是，环氧组分的加入加剧了部分共混EA的梯度分布，对界面变形能力的增强作用明显减弱。特别是在剪切应变范围内，ea - 30p -花岗岩界面的应变增长率降至15.21 % ~ 27.61 %。此外，不同聚集体界面的粘附性能表现出相似的规律。界面的表面特性和动态力学性能对骨料类型和DOB更为敏感，而环氧组分含量和DOB对界面剪切性能的影响最大。增加环氧组分含量和DOB有利于环氧组分微观结构形态的完整，但沥青的老化规律相反。

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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.