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  • 粒徑小于4.75mm的顆粒砂:細骨料用于填充粗骨料之間的縫隙,起到骨架的作用增加混凝土的強度。
  • 粒徑大于5mm的骨料:在混凝土中主要起骨架作用,粗骨料的種類不同,其材質、強度及化學成分等就不相同,從而影響混凝土的和易性、強度及耐久性等。

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