The measured Young's modulus of lightweight aggregate concrete using Lytag as coarse aggregate is lower than that calculating from existing empirical formula.
采用粉煤灰陶粒配制成的轻骨料混凝土，其弹性模量实测值低于现有的经验公式计算值。
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。
However, for the purposes of calculating volume discounts or rebates, if any, purchases made by Affiliates will count towards ITW's aggregate purchases.
然而，为了计算总额折扣或者返利为目的的，关联机构的采购将计入ITW总的采购数量。
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