Fatigue performance analysis of fine aggregate matrix using a newly designed experimental strategy and viscoelastic continuum damage theory

IF 3.4 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Materials and Structures Pub Date : 2024-06-20 DOI:10.1617/s11527-024-02338-6

Zhifei Tan, Hui Li, Zhen Leng, Binbin Yin, Danning Li, Fuliao Zou, Peng Cao

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Abstract

Fine aggregate matrix (FAM), as the matrix phase in asphalt concrete (AC), significantly affects the fatigue behavior of AC. To accurately assess the mechanical properties of FAM, a newly designed experimental strategy for FAM testing was developed, and the viscoelastic continuum damage theory (VECD) theory was applied to analyze FAM’s fatigue cracking characteristics. In this study, a dumbbell-shaped geometry for dynamic shear rheometer testing was designed and verified through the FE-aided method. Subsequently, three AC mixtures’ FAM specimens with this special geometry were fabricated for the frequency sweep and linear amplitude sweep tests. Results showed that the specially designed specimens effectively capture the viscoelastic and fatigue properties of FAM with high replicability. Analyses based on the VECD theory indicated that FAM of porous asphalt (FAM(PA13)), featuring a higher asphalt content, exhibits a significant reduction in pseudo stiffness with increasing damage at the initial stage, but the reduction rate diminishes as damage progresses when compared to the other two FAMs. It was speculated that the higher aggregate content in FAM of dense-graded AC mixture (FAM(AC20) induces stress concentrations in the asphalt mastic near the protrusion areas of aggregates, thereby rendering the sample more susceptible to damage. The proposed methods will be readily extended to characterize other mechanical properties of FAM.

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利用新设计的实验策略和粘弹性连续损伤理论分析细骨料基体的疲劳性能

细集料基质（FAM）作为沥青混凝土（AC）中的基质相，对 AC 的疲劳行为有显著影响。为了准确评估细集料基质的力学性能，研究人员开发了一种新设计的细集料基质测试实验策略，并应用粘弹性连续损伤理论（VECD）分析了细集料基质的疲劳开裂特性。本研究设计了用于动态剪切流变仪测试的哑铃形几何结构，并通过有限元辅助方法进行了验证。随后，利用这种特殊几何形状制作了三种交流混合材料的 FAM 试样，用于频率扫描和线性振幅扫描试验。结果表明，特殊设计的试样有效地捕捉到了 FAM 的粘弹性和疲劳特性，具有很高的可复制性。基于 VECD 理论的分析表明，与其他两种 FAM 相比，沥青含量较高的多孔沥青 FAM（FAM(PA13)）在初始阶段会随着损坏程度的增加而显著降低假刚度，但随着损坏程度的增加，假刚度的降低率会逐渐减小。据推测，密级配 AC 混合料的 FAM（FAM(AC20)）中集料含量较高，会在集料突出部位附近的沥青胶浆中引起应力集中，从而使试样更容易损坏。所提出的方法很容易扩展到表征 FAM 的其他机械性能。

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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.