骨料级配对C60混凝土强度的影响
Effect of Aggregate Gradation on the Strength of C60 Concrete

良好的骨料级配不仅可以提高混凝土的和易性、密实度和强度，还可以节约经济成本。本文将五组不同粒径的粗骨料进行组合进行混凝土配合比设计。根据设计配比拌制混凝土，分别测试其和易性，测试拌合物的表观密度，成型、标准条件养护，分别测试3d、7d、28d抗压强度，分析骨料级配对C60混凝土和易性和强度的影响规律。实验结果表明：粗骨料中间粒级骨料含量越多，和易性越好，强度越高；骨料级配越趋近于连续级配，混凝土强度就越高。
Good aggregate gradation can not only improve the workability, compactness and strength of concrete, but also save economic cost. In this paper, five groups of coarse aggregate with different particle sizes are combined to design the concrete mix proportion. Concrete shall be mixed according to the design proportion, and its workability, apparent density of the mixture, molding and curing under standard conditions shall be tested, and the compressive strength at 3D, 7d and 28d shall be tested respectively. The influence of aggregate gradation on workability and strength of C60 concrete is analyzed. The experimental results show that the more the content of coarse aggregate in the middle size, the better the workability and the higher the strength. The more the aggregate gradation approaches to continuous gradation, the higher the concrete strength is. The better the fluidity of the aggregate is, the stronger the ability to fill the mold; the denser the specimen is, and the higher the strength is.