Q3: B: 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

Structural Analysis
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Chapter2: Loads On Structures
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Q3: B: 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
%3D
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
Transcribed Image Text:Q3: B: 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 %3D 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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