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。
Gravity dam mainly relies on its own gravity to maintain the stability, with large volume, good stability, but for various reasons, it still may be breaked.
重力坝主要依靠其自身的重力来维持稳定，其坝体体积大，稳定性好，但由于各种原因，仍有可能失事。
The big physical volume concrete mainly uses in the big dam and responds a body, the foundation scaleboard of high building deep and large equipments foundation structure.
大体积混凝土主要用在大坝、反应堆体、高层建筑深基础底板以及大型设备基础结构。
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