Question

In: Civil Engineering

Design a PCC mix for the following scenario: CE 20400 Spring 2020 Design Environment: Unreinforced Slab...

Design a PCC mix for the following scenario:

CE 20400 Spring 2020

Design Environment: Unreinforced Slab in Minneapolis, Minnesota

                                   Consider the city to be a cold climate with severe weather

Required design strength: 4500 psi

Slab thickness:                   18 inches

Statistical data indicate a standard deviation of compressive strength of 200 psi

      (more than 30 samples)

Only air entrainer allowed

Air entrainer: Manufacturer specification is: 0.20 fl oz/1% air/100 lb cement

Course aggregate:             1 ½” nominal maximum size crushed stone

                                            Bulk oven dry specific gravity 2.5

                                            Absorption 0.2%

                                            Oven-dry rodded density 125 pcf

                                            Moisture content 1.5%

Fine aggregate:                  Natural sand

                                            Bulk oven dry specific gravity 2.45

                                            Absorption 0.2%

                                            Moisture content 4%

                                            Fineness modulus 2.8

Cement                               Specific gravity 3.15

                                

Solutions

Expert Solution

For the given specifications complete mix design is shown below.

Final mix proportion after moisture correction is given at the end.

Ally Wells answered 9 months ago
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