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集料是混凝土的主要组成材料,占混凝土总体积四分之三以上。一般把0.15～5mm粒径的集料称为细集料,如砂子,大于5mm粒径的集料称为粗集料,如卵石、碎石。集料在混凝土中既有技术上的作用,又有经济上的作用。在技术上,与单纯的水泥浆相比集料具有更高的体积稳定性和更好的耐久性;在经济上,集料属于地方性物料,是一种廉价的填充材料。
Aggregate is the main component of concrete, accounting for more than three quarters of the total volume of concrete. Generally, the aggregate of 0.15 to 5 mm in diameter is called fine aggregate, such as sand, and the aggregate of more than 5 mm in diameter is called coarse aggregate, such as pebbles and gravel. Aggregate has both technical and economical effects in concrete. In terms of technology, the aggregate has higher volume stability and better durability than the pure cement slurry; economically, the aggregate is a local material and is an inexpensive filler material.