Recommended Practice for the Design of Concrete Mixes (ACI 613-44)
ACI Committee 613
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The most practical procedure for determining the final proportions of concrete for a given purpose is to select a trial mix that will reauire the least adjustment on the job. An outline of the six steps involved in the determination of a trial mix are given which include: selection of water-cement ratio, selection of slump limits; determination of largest size aggregate; selection of minimum percentage of sand; an estimate of amount of water; the computation and adjustments of the trial mix proportions. The recommended procedure for making laboratory mix tests, as well as methods of determining the properties of the aggregates, appendix of the report. are given in the Important factors determined by tests of concrete mixes include: and strength; relation between water-cement ratio variations in workability for various combinations of the materials; and the unit water contents and cement requirements for various aggregate gradings.