Characterization of physicochemical composition of asphalt/aggregate and multi-scale analysis of interfacial adhesion behavior

IF 3.9 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Materials and Structures Pub Date : 2025-02-08 DOI:10.1617/s11527-025-02592-2

Guoqing Sun, Jiupeng Zhang, Zhenxing Niu, Yucheng Huang, Peixin Shi, Shuxian Zhang

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Abstract

This paper comprehensively studies the interface characters and behaviors of asphalt-aggregate by laboratory tests and molecular dynamics (MD) simulations. To accurately build the molecular model of asphalt-aggregate interface system and explore the nano-scale adhesion mechanism, the physicochemical composition of SARA components (saturate, aromatic, resin, and asphaltene) is characterized by macro–micro tests including SARA components separation and elemental analyzer. The mineral composition of aggregate is analyzed by X-ray diffraction test. The adhesion work, diffusion behavior and relative distribution of SARA components on aggregate surface are analyzed based on MD simulations. The results show that the influence of aggregate type on adhesion work is higher than that of asphalt type. The interfacial adhesion strength law obtained by pull-off test is highly consistent with the simulation results. Diffusion behavior is related to the polarity and proportion of SARA components and mineral types. Polar components have strong adhesion to minerals and are concentrated near the surface of minerals, and they are easily adsorbed on the surfaces of alkaline minerals such as calcite and albite. The adsorption characteristics of mineral surface will be affected by the proportion of SARA components.

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沥青/骨料的理化成分表征及界面粘附行为的多尺度分析

本文通过室内试验和分子动力学（MD）模拟，对沥青-骨料的界面特性和行为进行了全面研究。为准确建立沥青-骨料界面体系的分子模型，探索纳米尺度的粘附机理，通过SARA组分分离、元素分析仪等宏微观测试，表征了SARA组分（饱和、芳香、树脂、沥青烯）的理化组成。用x射线衍射试验分析了骨料的矿物组成。在MD模拟的基础上，分析了SARA组分在骨料表面的附着功、扩散行为和相对分布。结果表明：骨料类型对粘接性能的影响大于沥青类型；拉脱试验得到的界面粘接强度规律与模拟结果高度吻合。扩散行为与SARA组分的极性、比例和矿物类型有关。极性组分对矿物的附着力强，集中在矿物表面附近，容易吸附在方解石、钠长石等碱性矿物表面。矿物表面的吸附特性会受到SARA组分比例的影响。

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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.