Because of vast volume of a dam, the coarse aggregate of concrete used for constructing a dam is of large grain size and more grading.

由于水坝的体积大，用来筑坝的混凝土的粗骨科粒径大、分级多。合理确定最大粒径、分级尺寸和级配十分重要。

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It is very important to determine reasonably the maximum grain size, graded sizes and gradation of the coarse aggregate.

合理确定最大粒径、分级尺寸和级配十分重要。

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