Abstract In this work, we conducted an experimental and micromechanical investigation on the mechanical and chloride diffusion properties of recycled aggregates concrete (RAC). Due to the composite aspect of the recycled concrete aggregates (RCA), their impact on the properties of concretes is first evaluated by conducting an experimental campaign and further numerically modeled using micromechanical tools. Local mechanical properties of phases such as the attached mortar, the interfacial transition zones (ITZ) and the aggregates are also investigated by means of indentation tests at nano and microscale. Finally, experimentally informed multi scale model is established and the overall elastic modulus and chloride diffusion coefficient of concretes (with different rates of RCA) are computed and compared to experimental results at macroscopic scale for discussion. The established model provides a predictive tool for the mechanical and chloride diffusion properties of RAC.

中文翻译：

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再生骨料混凝土力学性能和耐久性能的试验和微观力学研究

摘要 在这项工作中，我们对再生骨料混凝土 (RAC) 的力学和氯离子扩散性能进行了实验和微观力学研究。由于再生混凝土骨料 (RCA) 的复合特性，首先通过进行实验评估它们对混凝土性能的影响，并使用微机械工具进一步进行数值模拟。还通过纳米和微米尺度的压痕测试研究了诸如附着砂浆、界面过渡区 (ITZ) 和骨料等相的局部机械性能。最后，建立了以实验为依据的多尺度模型，计算了混凝土的整体弹性模量和氯离子扩散系数（具有不同的 RCA 速率），并与宏观尺度的实验结果进行了比较以进行讨论。建立的模型为 RAC 的机械和氯化物扩散特性提供了预测工具。