粗骨料由砾石、碎石或其他合适的材料比¼。直径(6.4毫米)。声音粗骨料,硬,耐用是最适合制作混凝土。柔软的材料或片状或快速磨损是不令人满意的。
在大多数混凝土,正常体重的粗骨料尺寸3∕8之间是有限的。(9.5毫米)和11。(38.1毫米)。薄配料和板可能仅限于3∕8。(9.5毫米)聚合。粗骨料一样大6。(152.4毫米)直径是经常发现在大量的混凝土结构,如水坝。轻骨料通常仅限于最多1。(25.4毫米)。在墙壁,最大的任何类型的粗骨料不应超过五分之一整体壁厚。 The maximum size in slabs should be about one-third the slab thickness. The largest piece of aggregate should never be larger than three-quarters of the width of the narrowest space through which the concrete will be required to pass during placing. This is usually the space between the reinforcing bars or between the bars and the forms.