One of the most remarkable difference between manufactured sand and natural sand is stone dust whose particle size is less than 0.
机制砂中含有石粉是机制砂与天然砂之间最显著的区别之一，而石粉对机制砂混凝土性能影响也是机制砂混凝土研究的重点。
In this paper the characteristic of the particle size constitute of the natural aggregate is analysed and based on this the formula for calculating the specific surface of aggregate is derived.
本文剖析了天然集料的粒径构成特征，并据以导出计算集料此表面积的公式。
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