Design a concrete mix for the following conditions and constraints using the absolute volume method: Design Environment Building frame Required design strength = 27.6 MPa Minimum dimension = 150 mm Minimum space between rebars = 40 mm Minimum cover over rebars = 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 Manufacturer 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 = 0.3% 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
Design a concrete mix for the following conditions and constraints using the absolute volume method: Design Environment Building frame Required design strength = 27.6 MPa Minimum dimension = 150 mm Minimum space between rebars = 40 mm Minimum cover over rebars = 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 Manufacturer 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 = 0.3% 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
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Design a concrete mix for the following conditions and constraints using the absolute volume method:
Design Environment
Building frame
Required design strength = 27.6 MPa
Minimum dimension = 150 mm
Minimum space between rebars = 40 mm
Minimum cover over rebars = 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
Manufacturer 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 = 0.3%
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
Transcribed Image Text:Design a concrete mix for the following conditions and constraints
using the absolute volume method:
Design Environment
Bridge pier exposed to freezing and subjected to deicing chemicals
Required design strength = 24.1 MPa (3500 psi)
Minimum dimension = 0.3 m (12 in)
Minimum space between rebars = 64 mm (2.5 in)
Minimum cover over rebars = 64 mm (2.5 in)
Standard deviation of compressive strength of 2.4 MPa (350 psi) is
expected (more than 30 samples)
Only air entrainer is allowed
Available Materials
Cement
Select Type V due to exposure
Air Entrainer
Manufacturer specification 6.3 ml/1% air / 100 kg cement
(0.1 fl oz/ 1% air / 100 lb cement)
Coarse aggregate
25 mm (1 in) nominal maximum size, river gravel (round)
Bulk oven dry specific gravity = 2.621, Absorption = 0.4%
Oven dry-rodded density = 1681 kg/m³ (105 lb/ft³)
Moisture content = 1.5%
Fine aggregate
Natural sand
Bulk oven-dry specific gravity = 2.572, Absorption = 0.8%
Moisture content = 4%
Fineness modulus = 2.60
%3D
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