Investigating fracture behaviors of fiber-reinforced warm-mixed recycled SBS modified asphalt mixtures using the DIC and AE techniques under different loading modes

IF 5.6 2区工程技术 Q1 ENGINEERING, MECHANICAL

Theoretical and Applied Fracture Mechanics Pub Date : 2025-08-31 DOI:10.1016/j.tafmec.2025.105194

Wanmei Gui , Xiaozhi Hu , Lan Wang , Chao Li , You Zhan , Fei Zhang , Zehua Tian

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引用次数: 0

Abstract

To enhance the early-stage crack resistance of warm-mixed recycled asphalt mixtures, various types of reinforcing fibers were incorporated and investigated through a multi-scale analysis. Digital Image Correlation (DIC) and Acoustic Emission (AE), both non-destructive techniques, were utilized to monitor damage evolution in real-time. This study investigates the effects of basalt fiber morphology and fracture loading modes on the fracture resistance and synergistic crack resistance mechanisms of fiber-reinforced warm-mixed recycled SBS modified asphalt mixtures (WRAM-BF). Edge-Notched Disc Bending (ENDB) tests were conducted under mode I, mode III, and mixed mode I/III loading conditions using flocculent and chopped basalt fibers, combined with DIC and AE monitoring techniques. AE signal parameters, including source localization, peak frequency, and ringing counts, were analyzed to characterize the initiation and evolution of internal microcracks. DIC strain field mapping and the damage factor were employed to quantify full-field mesoscale strain distributions and crack propagation. The results indicate that the integration of AE and DIC facilitates a thorough and quantitative assessment of fracture behavior in WRAM-BFs. Specifically, flocculent fibers were found to effectively delay microcrack initiation, whereas chopped fibers significantly suppressed macrocrack propagation under various fracture modes. The findings also offer insights into the toughening mechanisms of fiber–rejuvenator synergy in sustainable asphalt composites.

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采用DIC和AE技术研究纤维增强热混合再生SBS改性沥青混合料在不同加载模式下的断裂行为

为了提高温拌再生沥青混合料的早期抗裂性能，采用多尺度分析方法对不同类型的增强纤维进行了掺入研究。数字图像相关（DIC）和声发射（AE）这两种非破坏性技术被用于实时监测损伤演变。研究了玄武岩纤维形态和断裂加载方式对纤维增强温混再生SBS改性沥青混合料（WRAM-BF）抗裂性能和协同抗裂机理的影响。采用絮凝纤维和短切玄武岩纤维，结合DIC和AE监测技术，在I模式、III模式和I/III混合加载条件下进行了edge - notch Disc Bending （ENDB）试验。分析了声发射信号参数，包括源定位、峰值频率和振铃计数，以表征内部微裂纹的起裂和演化。采用DIC应变场映射和损伤因子来量化全场中尺度应变分布和裂纹扩展。结果表明，声发射和DIC的整合有助于对WRAM-BFs的断裂行为进行全面和定量的评估。在不同断裂模式下，絮状纤维能有效延缓微裂纹萌生，而短切纤维能显著抑制大裂纹扩展。研究结果还为可持续沥青复合材料中纤维-恢复剂协同增韧机制提供了见解。

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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.