The current study is part of a larger project called RECYBETON developed in France since 2012. This part of project deals with the important properties of hardened concrete of recycled aggregates (RA), from microstructure to properties related to durability and fire behavior. The founding objective of the RECYBETON project is generally not to formulate concrete with a given recycling rate, but rather to optimize the recycling rate so that the benefit, whether economic or environmental, is maximized. This study describes a test campaign performed on reinforced concrete (RC) columns with different recycled aggregate ratios and a reference column made of natural aggregates. An eccentric compression‐loading device was developed to test the columns and determine the effects of small and high‐replacement ratios of recycled coarse and fine aggregates on the compression behavior of RC column. This required evaluating the mechanical behavior in compression and tension of the different materials (mechanical behavior of the various concretes according to their recycled aggregate ratios and the mechanical behavior of the steel). Finite element (FE) models were developed using Abaqus software and their performance validated based on experimental results of columns subjected monotonic loading to failure. The fracture mode was obtained by the finite element method, while the loads, displacements, and deformations of the steels and the concrete were studied and compared to the physical tests. Consistent results were obtained from the numerical and experimental tests.

中文翻译：

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再生粗骨料和细骨料制成的钢筋混凝土柱轴向压缩的试验和数值研究

当前的研究是2012年以来在法国进行的名为RECYBETON的较大项目的一部分。该项目涉及再生骨料（RA）硬化混凝土的重要性质，从微观结构到与耐久性和防火性能有关的性质。RECYBETON项目的创建目标通常不是以给定的回收率配制混凝土，而是优化回收率，以使经济或环境效益最大化。这项研究描述了对具有不同再生骨料比率的钢筋混凝土（RC）柱和由天然骨料制成的参考柱进行的测试活动。开发了一种偏心压缩加载设备来测试柱子，并确定回收率的粗骨料和细骨料的小和高置换率对RC柱的压缩行为的影响。这就需要评估不同材料在压缩和拉伸下的机械性能（根据混凝土的再生骨料比例和钢的机械性能来评估各种混凝土的机械性能）。使用Abaqus软件开发了有限元（FE）模型，并基于承受单调加载而失效的柱的实验结果验证了其性能。通过有限元方法获得断裂模式，同时研究了钢和混凝土的载荷，位移和变形，并与物理测试进行了比较。