The Strength of Portland-Cement Concrete as Affected by Air, Water and Cement Content,
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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The strength of concrete depends on many factors, the most important of which, normally, is the relative weight of water used per unit weight of cement. With the intentional introduction of air as an ingredient of concrete mixtures, it was found, as might have been expected, that the strength tended to be reduced, and the mobility and workability of the mixture tended to be increased as air was added.
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