Answer to Question #321495 in Civil and Environmental Engineering for Chaddwick

Question

Design Environment Pavement slab, Baguio City (severe 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 = 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

Find the following requirements:

Required Compressive Strength Water-Cement Ratio

Coarse Aggregate Requirement

Check Aggregate Size

Air Content (Use Maximum) Slump (Use Maximum)

Water Content

Cement Requirement Admixture

Fine Aggregate Requirement Final Batch Quantities (Adjusted Summary)