Design the concrete mix according to the following conditions:Design EnvironmentPavement slab, subjected to freezingRequired design strength = 21 MPaSlab thickness = 300 mmStatistical data indicate a standard deviation of compressive strength of1.7 MPa is expected (more than 30 samples).Only air entrainer is allowed.Available MaterialsAir entrainer: Manufacture specification is 9.5 mL/1% air/100 kgcement.Coarse aggregate: 2 in. nominal maximum size, crushed stoneBulk oven-dry specific gravity = 2.573, absorption = 2.8,Oven-dry rodded density = 1922 kg/m3Moisture content = 1,Fine aggregate: Natural sandBulk oven-dry specific gravity = 2.540, absorption = 3.4,Moisture content = 4.5,Fineness modulus = 2.68
Design the concrete mix according to the following conditions:Design EnvironmentPavement slab, subjected to freezingRequired design strength = 21 MPaSlab thickness = 300 mmStatistical data indicate a standard deviation of compressive strength of1.7 MPa is expected (more than 30 samples).Only air entrainer is allowed.Available MaterialsAir entrainer: Manufacture specification is 9.5 mL/1% air/100 kgcement.Coarse aggregate: 2 in. nominal maximum size, crushed stoneBulk oven-dry specific gravity = 2.573, absorption = 2.8,Oven-dry rodded density = 1922 kg/m3Moisture content = 1,Fine aggregate: Natural sandBulk oven-dry specific gravity = 2.540, absorption = 3.4,Moisture content = 4.5,Fineness modulus = 2.68
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
Design the concrete mix according to the following conditions:
Design Environment
Pavement slab, subjected to freezing
Required design strength = 21 MPa
Slab thickness = 300 mm
Statistical data indicate a standard deviation of compressive strength of
1.7 MPa is expected (more than 30 samples).
Only air entrainer is allowed.
Available Materials
Air entrainer: Manufacture specification is 9.5 mL/1% air/100 kg
cement.
Coarse aggregate: 2 in. nominal maximum size, crushed stone
Bulk oven-dry specific gravity = 2.573, absorption = 2.8,
Oven-dry rodded density = 1922 kg/m3
Moisture content = 1,
Fine aggregate: Natural sand
Bulk oven-dry specific gravity = 2.540, absorption = 3.4,
Moisture content = 4.5,
Fineness modulus = 2.68
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