Design the concrete mix according to the following conditions:Design Environment Caissons for Bridge pier crossing to the OuterBankers, 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 compressivestrength of 250 psi is expected (more than 30 samples).
Only air entrained is allowed. Available Materials Airentrainer: Manufacture specification is 0.15 fl oz/1% air/100 lbcement.
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
1. Calculate the strength requirements.(psi)
2. Part 2: Determine the water to cement ratio.
3: Calculate the volume of coarse aggregate (lb/yd^3)
4: Find the air content percentage (%)
5: Determine the workability.
