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In: Civil Engineering

Design the concrete mix according to the following conditions: Design Environment Pavement slab, Bozeman, Montana (cold...

Design the concrete mix according to the following conditions:

Design Environment
Pavement slab, Bozeman, Montana (cold climate)
Required design strength = 3000 psi

Slab thickness = 12 in

Statistical data indicate a standard deviation of compressive strength of 250 psi is expected (more than 30 samples)

Only air entrainer is allowed.
Available materials
Air entrainer: Manufacture specification is 0.15 fl oz/1% air/100lb cement

Coarse aggregate: 2in. nominal maximum size, crushed stone
Bulk oven dry specific gravity = 2.573, absorption = 2.8%
Oven dry rodded density = 120 pcf
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

Solutions

Expert Solution

Answer:

given data ;

required design strength = 3000 psi

slab thickness = 12 inches

air entrained : specification 0.15 fl oz/1% air / 100 lb cement

coarse aggregate :

bulk oven dry specific gravity =2.573

absorption = 2.8%

oven dry density = 120 psf

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

Ally Wells answered 11 months ago
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