Abstract
The author has developed a new approach for analyzing the relationship between aggregate gradation and strength of concrete. The method is applied to a number of different types of aggregate. This relationship is a surface area factor. The total surface area of all particles in one pound is defined as the “surface area factor”. Since this is a quantitative alternate for the fineness modulus the formulas include only the quantity of aggregate retained on the No. 100 sieve. Simple formulas are presented for the determination of the surface area of one pound of aggregate. These formulas are useful for any kind of structural concrete using river aggregate, crushed rock or lightweight aggregate. Preliminary experimental results are presented which support the formulas. Numerical examples illustrate the use of the formulas.
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