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首页> 外文期刊>Magazine of Concrete Research >Mesoscale studies on the effect of aggregate shape idealisation in concrete
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Mesoscale studies on the effect of aggregate shape idealisation in concrete

机译：中尺度研究骨料形状理想化对混凝土的影响

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Mechanical properties of concrete, such as strength, stiffness and its damage characteristics, are found to depend significantly on the properties of constituent materials. However, this dependency is rarely taken into consideration in the prediction of material response to mechanical loads. Instead, the most generally sought alternative for prediction of material response involves conducting laboratory tests. A mesoscale model that incorporates the properties of the mesostructure and its influence on mechanical response is adopted. Mesoscale models of concrete contain coarse aggregates, cement mortar and, optionally, an interfacial transition zone. An aggregate shape idealisation scheme is determined numerically to generate a circular aggregate mesoscale model by carrying out numerical simulations under uniaxial compression and tensile conditions. The numerical procedure followed in the present mesoscale simulations is validated with the available experimental data. The circular aggregate model is generated by idealising the actual irregular aggregate to a circular one using: (a) an area-equivalence approach and (b) a circumference-equivalence approach. To assess the effective idealisation scheme under static loading conditions, aspects such as strength, stiffness and damage distribution are considered. Simulation results show that the circumference-based model provides higher compressive strength and stiffness and lower tensile strength than the area-based model.
机译：发现混凝土的机械性能，例如强度，刚度及其破坏特性，在很大程度上取决于组成材料的性能。但是，在预测材料对机械载荷的响应时，很少考虑这种依赖性。相反，用于预测材料响应的最普遍寻求的替代方法是进行实验室测试。采用了中尺度模型，该模型包含了介观结构的特性及其对机械响应的影响。混凝土的中尺度模型包含粗骨料，水泥砂浆和（可选）界面过渡区。通过在单轴压缩和拉伸条件下进行数值模拟，通过数值确定骨料形状理想化方案以生成圆形骨料中尺度模型。目前的中尺度模拟所遵循的数值程序已通过可用的实验数据进行了验证。通过使用以下方法将实际的不规则聚合理想化为圆形，可以生成圆形聚合模型：（a）面积等效法和（b）圆周等效法。为了评估静态载荷条件下的有效理想化方案，考虑了强度，刚度和损伤分布等方面。仿真结果表明，与基于面积的模型相比，基于周长的模型提供了更高的抗压强度和刚度，以及更低的拉伸强度。

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