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Variations in the weight, density, absorption, and surface moisture of aggregates produce both independent and related effects on the properties of concrete. Some effects are the result of a direct relationship between one or more aggregate factors and a property of concrete, such as the influence of the weight and density of aggregates on the weight of concrete. Most of the important properties of concrete can also be influenced by these factors when they vary sufficiently to affect concrete proportions. Thus, an awareness of their significance and suitable methods of measurement can contribute to good control of concrete.
Brink, R. H.
Deputy chief, Office of Research and Development, Washington, D. C.
Timms, A. G.
Highway research engineer, Office of Research and Development, Washington, D. C.