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#### Concept explainers

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/100 lb cement.

Coarse aggregate: 2 in. 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

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# Chapter 7 Solutions

Materials for Civil and Construction Engineers (4th Edition)

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