Answer to Question #305317 in Civil and Environmental Engineering for James

Question

Design the concrete mix according to the following conditions:

Design Environment

 Pavement slab, Bozeman, Montana (cold climate)

 Required design strength = 3,000 psi

 Minimum dimension = 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 0.15fl.oz/1% air/100 lb cement.

 Coarse aggregate: 2 in nominal maximum size, crushed stone

 Bulk oven-dry specific gravity = 2.573, Absorption = 0.1%

 Oven-dry rodded density = 120 pcf

 Moisture content = 1%

 Fine aggregate: Natural sand

 Bulk oven-dry specific gravity = 2.54, Absorption = 0.2%

 Moisture content = 3.67%

 Fineness modulus = 2.68

Answer 1

Answer is given below