By Vance H. Dodson Ph.D. (auth.)
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Extra resources for Concrete Admixtures
This later method is not intended as an alternative test for concrete cylinders, and the test values obtained by the two test methods are not interchangeable and not necessarily comparable. The compressive strength of mortar is determined on 2" x 2" X 2" cubes in accordance with ASTM ClO9  . COMPRESSIVE STRENGTH The compressive strength of concrete and lor mortar, in which admixtures or additions are absent, is a function of the following variables: • Water-cement ratio, which is the ratio of the amount of water, exclusive of that absorbed by the aggregates, to the amount of cement, by weight, and is frequently expressed as W IC .
02, pp. 245-252 (1988).  ASTM C39, "Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens," Annual Book of ASTM Standards, Vol. 02, pp. 1921 (1988).  ASTM C873, "Standard Test Method for Compressive Strength of Concrete Cylinders Cast in Place in Cylindrical Molds," Annual Book of ASTM Standards, Vol. 02, pp. 427-419, (1988).  ASTM C116, "Standard Test Method for Compressive Strength of Concrete Using Portions of Beams Broken in Flexure," Annual Book of ASTM Standards, Vol.
This is not to be confused with the term, addition, which is either interground with or blended into a portland cement during its manufacture. An addition, is classified as being either (1) a processing addition, which aids in the manufacture and handling of the finished product, or (2) a functional addition which modifies the use properties of the cement. Admixtures can function by several mechanisms. 1. Dispersion of the cement in the aqueous phase of concrete. 2. Alteration of the normal rate of hydration of the cement, in particular the tricalcium silicate phase.