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Economic considerations which influence the selection of aggregate gradings and grading specifications currently used by state and national organizations are listed and discussed. Attention is called to the lack of uniformity in screen sizes and size fractions employed by the organizations listed. Grading limits are recommended for fine aggregate with the statement that the coarse aggregate may vary through wide limits, provided the optimum amount of sand is used in the mix. It is concluded that the most ideally graded aggregate from a quality standpoint is one which will give the desired degree of workability with the least amount of mixing water.
Price, Walter H.
Materials Engineer, Bureau of Reclamation, Denver, Colo