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混凝土杨氏模量预测的三相复合球模型

, PP. 102-107

Keywords: 混凝土,界面,杨氏模量,三相复合球

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Abstract:

提出了混凝土杨氏模量预测的三相复合球模型。在细观水平上将混凝土看成是一种由分散相骨料、中间相界面和连续相水泥浆所组成的三相复合材料。应用混凝土细观结构模拟技术,获得了任一级配骨料的界面体积分数。模拟结果表明,李氏近似法高估了界面体积分数,界面体积分数在很大程度上取决于界面厚度、最大骨料直径和骨料级配。引入三相复合球模型,给出了混凝土杨氏模量的解析解。将解析解与实验结果进行比较,证实了本文模型的有效性。数值结果也表明,对于给定的骨料体积分数,混凝土杨氏模量随着最大骨料直径和界面杨氏模量的增大而增大,但随着界面厚度的增大而减小,骨料级配对混凝土杨氏模量也有较大影响。

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