Design the concrete mix according to the following conditions:Design EnvironmentBuilding frameRequired design strength = 27.6 MPaMinimum dimension = 150 mmMinimum space between rebar = 40 mmMinimum cover over rebar = 40 mmStatistical data indicate a standard deviation of compressive strength of2.1 MPa is expected (more than 30 samples).Only air entrainer is allowed.Available MaterialsAir 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/m3Moisture content = 2.5,Fine aggregate: Natural sandBulk oven-dry specific gravity = 2.659, absorption = 0.5,Moisture content = 2,Fineness modulus = 2.47
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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