Abstract Ever since the early days of Feret (1892) and Abrams (1919), concrete research has targeted at relating concrete composition to uniaxial compressive strength. While these activities were mainly characterized by empirical fitting functions, we here take a more fundamental approach based on continuum micromechanics. The loading applied at the concrete level, is first concentrated (“downscaled”) to maximum stresses related to cement paste volumes which are directly adjacent to the aggregates, i.e. to the interfacial transition zones (ITZ). These maximum stresses are further “downscaled” to the micron-sized hydrates, in terms of higher-order stress averages. The latter enter a Drucker-Prager failure criterion with material constants derived from nanoindentation tests. The model is successfully validated across the hydrate-to-concrete scales. Strength magnitude is governed by ITZ stress concentrations, and the water-to-cement ratio is its dominant mixture design parameter.

中文翻译：

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ITZ 中的水合物破坏控制混凝土强度：经过微观到宏观验证的工程力学模型

摘要自 Feret (1892) 和 Abrams (1919) 的早期以来，混凝土研究的目标是将混凝土成分与单轴抗压强度联系起来。虽然这些活动的主要特征是经验拟合函数，但我们在这里采用了一种基于连续微观力学的更基本的方法。施加在混凝土层上的载荷首先集中（“缩小”）到与水泥浆体积相关的最大应力，这些应力与骨料直接相邻，即与界面过渡区 (ITZ) 相邻。就高阶应力平均值而言，这些最大应力进一步“缩小”为微米级水合物。后者进入 Drucker-Prager 失效准则，其材料常数来自纳米压痕测试。该模型在水合物到混凝土的尺度上得到了成功验证。