中文摘要：

在分析传统混凝土两相复合材料弹性模量计算模型不足的基础上，考虑混凝土中界面过渡区的影响，分析界面过渡区的体积与骨料体积分数、骨料颗粒级配和界面过渡区厚度之间的关系，建立预测混凝土弹性模量的三相复合材料模型，并在此基础上计算全级配混凝土与湿筛混凝土的弹性模量，并与已有试验结果进行比较，吻合良好。分析全级配与湿筛混凝土弹性模量比值与骨料及水泥基体弹性模量比值的关系，给出了随龄期变化时两者弹性模量比值的变化规律。

英文摘要：

Based on the shortcomings of the existing traditional two-phase model of elastic modulus for two-phase composites, and considering the influence of the interface transition zone （ITZ） in concrete, the relationships between volume percent of ITZ and aggregate and the thickness of ITZ and aggregate grading are analyzed. A three-phase model for predicting the elastic modulus is established. The elastic modulus of full-grade and wet sieving concrete were calculated with this model, and the results are in good agreement with existing experimental results. The relafionship between the ratio of a fidl-grade concrete elastic modulus and a wet sieving concrete elastic modulus and the ratio of the aggregate elastic modulus and cement matrix elastic modulus were studied. The change law of the elastic modulus ratio is given when the age of concrete changes.