CONCRETE MIX DESIGN PROBLEM
A concrete mix for a concrete column exposed to mild climate is to be designed according to the
ACI Absolute Volume Method. A non-air-entrained concrete is to be used. The specified 28-
day compressive strength (f’c) is 4,800 psi. No past data are available to establish the standard of
deviation of the compressive strength of the concrete. The specified slump of the fresh concrete
is 3 to 4 inches. The cement used will be a Type I cement. Assume the following properties for
the aggregates:
Coarse Agg. Fine Agg.
Dry Bulk Specific Gravity 2.35 2.61
Absorption 4.9% 0.4%
Natural Moisture Content 2.5% 0.2%
Dry-Rodded Unit Weight 88 pcf -
Nominal Maximum Aggregate Size 3/4 inch -
Fineness Modulus - 2.4
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