7.8 Design the concrete mix according to the following conditions: Design Environment Building frame Required design strength Minimum dimension = 27.6 MPa = 150 mm Minimum space between rebar Minimum cover over rebar = 40 mm = 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.

Structural Analysis
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ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
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7.8 Design the concrete mix according to the following conditions:
Design Environment
Building frame
Required design strength
Minimum dimension
27.6 MPa
||
150 mm
Minimum space between rebar
Minimum cover over rebar
Statistical data indicate a standard deviation of compressive strength of
2.1 MPa is expected (more than 30 samples).
Only air entrainer is allowed.
40 mm
= 40 mm
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
Oven-dry rodded density
Moisture content = 2.5%
2.55, Absorption
= 0.3%
= 1761 kg/m³
Fine aggregate: Natural sand
Bulk oven-dry specific gravity
2.659, Absorption
0.5%
Moisture content =
2%
Fineness modulus
2.47
%3D
Transcribed Image Text:7.8 Design the concrete mix according to the following conditions: Design Environment Building frame Required design strength Minimum dimension 27.6 MPa || 150 mm Minimum space between rebar Minimum cover over rebar Statistical data indicate a standard deviation of compressive strength of 2.1 MPa is expected (more than 30 samples). Only air entrainer is allowed. 40 mm = 40 mm 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 Oven-dry rodded density Moisture content = 2.5% 2.55, Absorption = 0.3% = 1761 kg/m³ 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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