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Design the concrete mix according to the following conditions:
Design Environment
Building frame
Required design strength = 27.6 MPa
Minimum dimension = 150 mm
Minimum space between rebar = 40 mm
Minimum cover over rebar = 40 mm
Statistical data indicate a standard deviation of compressive strength of 2.1 MPa is expected (more than 30 samples).
Only air entrainer is allowed.
Available Materials
Air entrainer: Manufacture specification 6.3 ml/1% air/100 kg cement. Coarse aggregate: 19 mm nominal maximum size, river gravel (rounded)
Bulk oven-dry specific gravity = 2.55, absorption = 3.6%
Oven-dry rodded density = 1761 kg/m3
Moisture content = 2.5%
Fine aggregate: Natural sand
Bulk oven-dry specific gravity = 2.659, absorption = 0.5%
Moisture content = 2%
Fineness modulus = 2.47
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