The Laws of Proportioning Concrete

Experiments made by one of the authors at Little Falls, N. J., in 1901, upon the density and transverse strength of concrete beams mixed in various proportions, by weight, ranging in proportions from 1 : 0 to 1 : 6 : 10, indicated that the strength of concrete varies with the percentage of cement contained in a unit volume of the set concrete, and also with the density of the specimen. With the same percentage of cement in a given volume of concrete, the densest mixture, irrespective of the relative proportions of the sand and stone, was in general the strongest.