Design a concrete mix for the following conditions and constraints using the ACI
method.
Design Environment
Bridge pier exposed to freezing and subjected to deicing chemicals
Specified Design Strength = 3,500 psi
Minimum dimension = 12 inches
Minimum space between rebars = 2 inches
Minimum cover over rebars = 1.5 inches
Only air entrainer is allowed
Available Materials
Cement – Type V due to exposure
Air Entrainer – Manufacterer specification 0.1 fl oz/1% air/100 lb of cement)
Coarse Aggregate
1 inch maximum size, river gravel (round)
Bulk oven dry specific gravity = 2.621, Absrption = 0.4%
Oven-dry roddeed density = 105 pcf
Moisture content = 1.5%
Fine Aggregate
Natural sand
Bulk oven-dry specific gravity = 2.572, Absorption = 0.8%
Moisture content = 4%
Fineness modulus = 2.6