Fracture investigation and acoustic emission characteristics of semi-flexible pavement materials under different temperatures

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-09-08 DOI:10.1016/j.tafmec.2025.105232

Weimin Song , Yuanqi Liang , Xiaoyang Zhang , Hao Wu , Hanyuan Li

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引用次数: 0

Abstract

Semi-flexible pavement (SFP) exhibits superior rutting resistance, yet its cracking performance remains a critical concern due to inadequate interfacial bonding between the porous asphalt mixture (PAM) and the grouting material. To address this challenge, this study investigated fracture behavior and interfacial enhancement strategies for SFP through silane coupling agent (KH550) modification. Fracture performance was assessed via semi-circular bending (SCB) tests at −10℃ and 25℃, combined with acoustic emission (AE) monitoring and microstructural characterization. Results revealed that KH550 modification increased stress intensity factors by 10.7 % and 8.9 % at low (−10℃) and intermediate (25℃) temperatures, respectively, while enhancing total fracture energy by 55.1 % and 29.3 % under corresponding conditions. AE analysis highlighted distinct failure mechanisms: low-temperature (−10℃) fractures exhibited brittle failure with concentrated high-energy AE events, whereas the elevated temperature (25℃) promoted plastic deformation, suppressing AE activity. Gaussian Mixture Model (GMM) clustering and GMM + Support Vector Machine (SVM) clustering of RA and AF data identified tensile cracking as the predominant failure mode, with KH550 further amplifying tensile crack ratios at −10℃ due to interfacial adhesion-induced brittleness. Scanning Electron Microscopy and Energy-Dispersive X-ray Spectroscopy (SEM-EDS) confirmed KH550′s interfacial enhancement, demonstrating denser hydration products and elemental redistribution at the asphalt-grout interface. These microstructural improvements correlated with macro-scale performance gains, where an optimized interfacial transition zone facilitated efficient stress transfer and crack resistance.

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半柔性路面材料在不同温度下的裂缝研究及声发射特性

半柔性路面（SFP）具有优异的抗车辙性能，但由于多孔沥青混合料（PAM）与注浆材料之间的界面粘结不足，其开裂性能仍然是一个关键问题。为了解决这一挑战，本研究通过硅烷偶联剂（KH550）改性研究了SFP的断裂行为和界面增强策略。通过- 10℃和25℃的半圆弯曲（SCB）测试，结合声发射（AE）监测和微观结构表征来评估断裂性能。结果表明，在低温（−10℃）和中温（25℃）条件下，KH550改性后的应力强度因子分别提高了10.7%和8.9%，总断裂能分别提高了55.1%和29.3%。声发射分析强调了不同的破坏机制：低温（- 10℃）裂缝表现为脆性破坏，高能声发射事件集中，而高温（25℃）促进塑性变形，抑制声发射活动。对RA和AF数据进行高斯混合模型（GMM）聚类和GMM +支持向量机（SVM）聚类，发现拉伸裂纹是主要的破坏模式，KH550进一步放大了- 10℃时界面粘连脆性导致的拉伸裂纹比。扫描电子显微镜和能量色散x射线能谱（SEM-EDS）证实了KH550的界面增强作用，表明沥青-浆液界面的水化产物更密集，元素重新分布。这些微观结构的改进与宏观性能的提高相关，其中优化的界面过渡区促进了有效的应力传递和抗裂性。

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来源期刊

Theoretical and Applied Fracture Mechanics 工程技术-工程：机械

CiteScore

8.40

自引率

18.90%

发文量

435

审稿时长

37 days

期刊介绍： Theoretical and Applied Fracture Mechanics'' aims & scopes have been re-designed to cover both the theoretical, applied, and numerical aspects associated with those cracking related phenomena taking place, at a micro-, meso-, and macroscopic level, in materials/components/structures of any kind. The journal aims to cover the cracking/mechanical behaviour of materials/components/structures in those situations involving both time-independent and time-dependent system of external forces/moments (such as, for instance, quasi-static, impulsive, impact, blasting, creep, contact, and fatigue loading). Since, under the above circumstances, the mechanical behaviour of cracked materials/components/structures is also affected by the environmental conditions, the journal would consider also those theoretical/experimental research works investigating the effect of external variables such as, for instance, the effect of corrosive environments as well as of high/low-temperature.