Klimczak Marek, Oleksy Marta
Faculty of Civil Engineering, Cracow University of Technology, 31-155 Cracow, Poland.
Materials (Basel). 2025 May 15;18(10):2297. doi: 10.3390/ma18102297.
The overall response of asphalt concrete under a subjected load is governed not only by the properties of its constituents but also by the interactions among them. In this paper, we focus on the numerical analysis of aggregate debonding, which is typically a phenomenon that precedes crack initiation. The interfacial transition zone plays a crucial role in the macroscopic performance of this material. Using image processing to reconstruct a specific sample microstructure, we carried out several finite element analyses to assess the impact of the debonding phenomenon on the general performance of asphalt concrete. Image segmentation algorithms were employed to accurately detect aggregate boundaries, followed by vectorization to describe their geometries. After applying a series of error-controlled geometry simplification procedures, the final microstructure was exported to the ABAQUS/Standard 2023 environment. A linear elastic solution for the reconstructed asphalt concrete sample was used as the reference solution. It was compared with linear viscoelastic solutions with a perfect bonding between constituents and, in the next step, with debonding allowed at aggregate-matrix interfaces. The latter phenomenon was analyzed by enforcing respective contact conditions between the aggregate and the bituminous matrix. It was found that introducing the viscoelastic material model for mastic resulted in a 142.72% increase in the vertical extreme displacement relative to the purely elastic solution. When debonding effects were additionally considered, this increase rose to 188.44%. The results confirm the necessity of debonding conditions to be introduced in reliable finite element analyses of asphalt concrete.
沥青混凝土在承受荷载时的整体响应不仅取决于其组成成分的特性，还取决于它们之间的相互作用。在本文中，我们专注于集料脱粘的数值分析，这通常是裂纹萌生之前的一种现象。界面过渡区在这种材料的宏观性能中起着至关重要的作用。通过图像处理重建特定样本的微观结构，我们进行了多次有限元分析，以评估脱粘现象对沥青混凝土总体性能的影响。采用图像分割算法准确检测集料边界，然后进行矢量化以描述其几何形状。在应用一系列误差控制的几何简化程序后，最终的微观结构被导出到ABAQUS/Standard 2023环境中。将重建的沥青混凝土样本的线弹性解用作参考解。将其与组分之间具有完美粘结的线性粘弹性解进行比较，下一步，再与集料 - 基体界面允许脱粘的情况进行比较。通过施加集料与沥青基体之间的相应接触条件来分析后一种现象。结果发现，相对于纯弹性解，引入胶泥的粘弹性材料模型使垂直极限位移增加了142.72%。当额外考虑脱粘效应时，这一增加幅度上升至188.44%。结果证实了在可靠的沥青混凝土有限元分析中引入脱粘条件的必要性。
