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首页> 外文期刊>International journal of mechanics and materials in design >Mesoscale analysis of rubber particle effect on young's modulus and creep behaviour of crumb rubber concrete
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Mesoscale analysis of rubber particle effect on young's modulus and creep behaviour of crumb rubber concrete

机译：橡胶粒子效应的介质分析杨氏模量和颅骨混凝土蠕变行为

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This paper presents a mesoscale model to investigate the rubber particle effect on the mechanical properties of crumb rubber concrete (CRC). Taking Young's modulus as an example, the short-term and long-term compressive behaviour of CRC with varying rubber percentages, shapes, and sizes were simulated. As the first step of the simulation, the Walraven equation was used to convert the 3D distribution of coarse aggregate and rubber particles in an actual specimen to a 2D distribution in a plane state. Then four differently shaped coarse aggregates and rubber particles including circular, elliptical, circle-derived polygonal, and ellipse-derived polygonal aggregate were generated. Based on an overlap judgement algorithm, Python programs were compiled to create a three-phase mortar-coarse aggregate-rubber CRC model and a two-phase concrete-rubber CRC model. All results from both models with varying particle shapes are within the range of experimental values. When the rubber content of CRC samples was 18%, the maximum deviation between the two-phase model and the three-phase CRC model was only 1.4%. Numerical results verified that incorporating rubber particles in concrete reduced material rigidity. The rubber percentage was the main influencing factor on the reduction rate of Young's modulus of CRC, while the influence from varying crumb rubber particle shapes and sizes was ignorable. For practical applications, a prediction formula for Young's modulus of CRC was provided. The proposed mesoscale model was also applied to the creep behaviour analysis of CRC, showing that the addition of crumb rubber particles had little effect on the creep coefficient of rubber concrete. The numerical results agreed well with the experimental study.
机译：本文介绍了迈空尺度模型，用于研究对橡胶混凝土（CRC）的橡胶粒子效应。以杨氏模量为例，模拟了CRC的短期和长期压缩行为，具有不同的橡胶百分比，形状和尺寸。作为模拟的第一步骤，使用Walraven方程用于将实际标本中的粗骨料和橡胶颗粒的3D分布转换为平面状态的2D分布。然后产生四种不同形状的粗聚集体和包括圆形，椭圆形，圆形多边形和椭圆衍生的多边形聚集体的橡胶颗粒。基于重叠判断算法，编译Python程序以创建三相砂浆 - 粗骨料 - 橡胶CRC模型和两相混凝土橡胶CRC模型。两种具有不同粒子形状的模型的所有结果都在实验值范围内。当CRC样品的橡胶含量为18％时，两相模型和三相CRC模型之间的最大偏差仅为1.4％。数值结果证实，在混凝土中掺入橡胶颗粒降低的材料刚性。橡胶百分比是对CRC的杨氏模量的减少率的主要影响因素，而不同碎屑橡胶颗粒形状和尺寸的影响是无知的。对于实际应用，提供了用于CRC的杨氏模量的预测公式。所提出的Messcale模型也应用于CRC的蠕变行为分析，表明胶囊颗粒的添加对橡胶混凝土的蠕变系数几乎没有影响。数值结果与实验研究相同。

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