Abstract Aggregate interlocking allows transferring shear and normal stresses through open cracks, and is considered to significantly contribute to the force transfer in cracked concrete. The complex phenomenon depends on the roughness of cracked surfaces, where material protruding from one side may engage with the opposite one. Two-Phase models were established in the 1980s by Walraven to estimate the force transfer, distinguishing between cement matrix and spherical aggregates. The approach leads to good results but has several shortcomings. In this paper, the fundamental assumptions are reviewed using specific numerical and experimental investigations. Special tests respecting the geometrical assumptions are presented and the results compared with numerically calculated estimates. The model is extended to address some shortcomings and investigate the physical nature of the main parameters. Positive aspects of Two-Phase models and a number of limitations are highlighted, allowing a consistent step forward in the understanding of aggregate interlocking.

中文翻译：

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使用数值方法和实验证据回顾开裂混凝土中骨料互锁的两相模型的基本假设

摘要 骨料互锁允许通过开裂传递剪应力和法向应力，并被认为对开裂混凝土中的力传递有显着贡献。复杂的现象取决于裂纹表面的粗糙度，从一侧突出的材料可能会与另一侧接触。Walraven 在 1980 年代建立了两相模型来估计力传递，区分水泥基体和球形骨料。该方法导致良好的结果，但有几个缺点。在本文中，使用特定的数值和实验研究来回顾基本假设。介绍了有关几何假设的特殊测试，并将结果与​​数值计算的估计值进行了比较。该模型被扩展以解决一些缺点并研究主要参数的物理性质。强调了两阶段模型的积极方面和许多限制，从而在理解聚合互锁方面向前迈出了一致的一步。