资料简介： Properties of Concrete and Reinforced ConcreteConcrete is a man-made conglomerate stone composed of essentially four ingredients：Portland cement，water，sand，and coarse aggregate，The cement and water combine to make a paste that binds the sand and stones together．Ideally，the aggregates are graded so that the volume of paste is at a minimum，merely surrounding every piece with a thin 1ayer．Most structural concrete is stone concrete，but structural lightweight concrete(roughly two-thirds the density of stone concrete)is becoming increasingly popular．混凝土和钢筋混凝土的特性
混凝土是一种人造组合石材，主要由四种成分组成：波特兰泥，水，砂子和粗骨料。水泥和水混合成水泥浆，将砂子和石子粘合在一起。理想的骨料级配应使泥浆的体积最小，仅将每块骨料包上薄薄的一层即可。大多数结构混凝土是碎石混凝土，但是轻质结构混凝土(大约是碎石混凝土密度的2／3)正日益得到普及。
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