Construction and demolition (C&D) wastes are being extensively utilized in pavement and railway construction projects. Chemical stabilization with binders such as cement enhances the physical and strength properties of C&D materials. In this study, a numerical model has been developed to simulate the macro- and micro-mechanical properties of lightly cement stabilized recycled concrete aggregates (RCA) under unconfined compression and k₀ loading-unloading condition. The model considers the unique nature of RCA materials in terms of particle size distribution and void ratio. The cement chains were utilized to simulate the cementation product and can be altered to model samples with various cement contents and curing conditions. Results indicated that the proposed model performed well in estimating the stress-strain behavior of cemented RCA sample under unconfined compression test as well as estimating the changes in the sample’s void ratio during one-dimensional compression test (k₀ loading condition). The results of the micro-scale analyses indicated that during uniaxial loading the contact forces did not change direction significantly, while the magnitude of the forces transmitted through the sample increased markedly. The parametric analysis results furthermore demonstrated that the cement contact bond parameters strongly affected the performance of the numerical model.

建筑和拆迁（C＆D）废物被广泛用于路面和铁路建设项目。使用粘合剂（例如水泥）的化学稳定性增强了C＆D材料的物理和强度特性。在这项研究中，已经建立了一个数值模型来模拟轻度水泥稳定的再生混凝土骨料（RCA）在无限制压缩和k ₀下的宏观和微观力学性能。装卸条件。该模型在粒度分布和空隙率方面考虑了RCA材料的独特性质。水泥链用于模拟胶结产物，可以更改为具有各种水泥含量和固化条件的模型样品。结果表明，所提出的模型在估算无约束压缩试验下胶结RCA样品的应力-应变行为以及估算一维压缩试验期间样品空隙率的变化方面均表现出色（k ₀加载条件）。微观分析的结果表明，在单轴加载过程中，接触力不会明显改变方向，而通过样品传递的力的大小则显着增加。参数分析结果进一步表明，水泥接触键参数强烈影响数值模型的性能。