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In: Civil Engineering

Design the concrete mix according to the following conditions: Design Environment Caissons for Bridge pier crossing...

Design the concrete mix according to the following conditions: Design Environment Caissons for Bridge pier crossing to the Outer Bankers, NC Required design strength=4800psi

Minimum dimension = 12 in.

Minimum space between rebars = 2.5 in.

Minimum cover over rebars = 2.5 in. Statistical data indicate a standard deviation of compressive strength of 250 psi is expected (more than 30 samples).

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

Aggregate: 1 in. nominal maximum size, crushed stone

Bulk oven-dry specific gravity=2.45,absorption=2.5%

Oven-dry rodded density=125pcf

Moisture content=1.5%

Fine aggregate: Natural sand

Bulk oven-dry specific gravity=2.61,absorption=3.4%

Moisture content=3.8%

Fineness modulus=2.81

6: Calculate the desired water content (lb/yd^3)

7: Calculate the Cement Content (lb/yd^3)

8: Calculate the admixture requirements.(fl oz/yd^3))

9: Calculate the weight of the Fine Aggregate.(lb/yd^3))

10: Calculate the new water requirement based on the moisture corrections (lb/yd^3)

Solutions

Expert Solution

Complete mix design as per given specifications is shown below.

Ally Wells answered 7 months ago
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