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 Maximum slump is required 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. (Use maximum or +2% air content) Coarse aggregate: 19 mm nominal maximum size, river gravel (rounded) Bulk oven-dry specific gravity = 2.55, Absorption = 0.3% Oven-dry rodded density = 1761 kg/m³ Moisture content = 2% Fine aggregate: Natural Sand Bulk 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 Maximum slump is required 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. (Use maximum or +2% air content) Coarse aggregate: 19 mm nominal maximum size, river gravel (rounded) Bulk oven-dry specific gravity = 2.55, Absorption = 0.3% Oven-dry rodded density = 1761 kg/m³ Moisture content = 2% Fine aggregate: Natural Sand Bulk oven-dry specific gravity = 2.659, Absorption = 0.5% Moisture content = 2% Fineness modulus = 2.47
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text: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
Maximum slump is required
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. (Use maximum
or +2% air content)
Coarse aggregate: 19 mm nominal maximum size, river gravel (rounded)
Bulk oven-dry specific gravity = 2.55, Absorption = 0.3%
Oven-dry rodded density = 1761 kg/m3
Moisture content = 2%
Fine aggregate: Natural Sand
Bulk oven-dry specific gravity = 2.659, Absorption = 0.5%
Moisture content = 2%
Fineness modulus = 2.47
%3D
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