Microscopic self-healing of multi-walled carbon nanotube-modified asphalt based on the dual diffusion-energy theory

IF 1.1 4区工程技术 Q3 ENGINEERING, CIVIL

Canadian Journal of Civil Engineering Pub Date : 2023-11-23 DOI:10.1139/cjce-2023-0263

Minmin Xiao, Xu Guo, Jinyong Dong, Chunyan Li, Jianguo Ren

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引用次数: 0

Abstract

To investigate the self-healing performance of multi-walled carbon nanotube-modified asphalt and its influencing mechanism, the asphalt molecular self-healing models were established by the molecular dynamics method. The results were analyzed based on molecular diffusion theory and surface energy repair theory. Based on the Arrhenius model, two theories were combined, and a new index healing factor was proposed to evaluate the self-healing performance by considering the diffusion characteristics and energy changes of asphalt molecules. The results show that multi-walled carbon nanotubes can accelerate the diffusion behavior of molecules in the temperature of 278--318 K to improve the self-healing properties of asphalt. Based on the proposed surface free energy equation, the self-healing properties are reasonably evaluated; the enthalpy change can be used as an index for judging the self-healing performance. The transformation model of the diffusion coefficient and cohesive work and the new index can reflect the self-healing performance more comprehensively.

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基于扩散-能量双重理论的多壁碳纳米管改性沥青的微观自愈合

为研究多壁碳纳米管改性沥青的自修复性能及其影响机理，采用分子动力学方法建立了沥青分子自修复模型。根据分子扩散理论和表面能修复理论对结果进行了分析。在阿伦尼乌斯模型的基础上，结合两种理论，提出了一种新的指数修复因子，通过考虑沥青分子的扩散特性和能量变化来评价自修复性能。结果表明，多壁碳纳米管能加速分子在 278-318 K 温度下的扩散行为，从而改善沥青的自愈性能。根据提出的表面自由能方程，合理评价了沥青的自愈性能；焓变可作为判断自愈性能的指标。扩散系数和内聚功的转化模型及新指标能更全面地反映自愈性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Canadian Journal of Civil Engineering 工程技术-工程：土木

CiteScore

3.00

自引率

7.10%

发文量

105

审稿时长

14 months

期刊介绍： The Canadian Journal of Civil Engineering is the official journal of the Canadian Society for Civil Engineering. It contains articles on environmental engineering, hydrotechnical engineering, structural engineering, construction engineering, engineering mechanics, engineering materials, and history of civil engineering. Contributors include recognized researchers and practitioners in industry, government, and academia. New developments in engineering design and construction are also featured.