Design the concrete mix according to the following conditions: Design Environment • Building beam o Required design strength = 27.6 MPa o Minimum dimension = 150 mm o Minimum space between rebar = 40 mm o Minimum cover over rebar = 40 mm o Statistical data indicate a standard deviation of compressive strength of 2.1 MPa is expected (more than 30 samples). • Only air entrainer is allowed. • Moderate Sulphate exposure. • Available Materials o Air entrainer: ▪ Manufacture specification 6.3 mL/1% air/100 kg cement. o Coarse aggregate: ▪ 19 mm nominal maximum size ▪ River gravel (rounded) ▪ Bulk oven-dry specific gravity = 2.55 ▪ Absorption = 3.6 ▪ Oven-dry rodded density = 1761 kg/m3 ▪ Moisture content = 2.5 o Fine aggregate: ▪ Natural sand ▪ Bulk oven-dry specific gravity = 2.659 ▪ Absorption = 0.5 ▪ Moisture content = 2 ▪ Fineness modulus = 2.47 o Cement ▪ Type II (Moderate Sulphate Resistant) ▪ Specific Gravity = 3.15 Based on this information, find the following and summarize the findings in a table d) The amount of fine aggregate (kg) e) The corrected amount of mixing water (kg).
Design the concrete mix according to the following conditions:
Design Environment
• Building beam
o Required design strength = 27.6 MPa
o Minimum dimension = 150 mm
o Minimum space between rebar = 40 mm
o Minimum cover over rebar = 40 mm
o Statistical data indicate a standard deviation of compressive strength
of 2.1 MPa is expected (more than 30 samples).
• Only air entrainer is allowed.
• Moderate Sulphate exposure.
• Available Materials
o Air entrainer:
▪ Manufacture specification 6.3 mL/1% air/100 kg cement.
o Coarse aggregate:
▪ 19 mm nominal maximum size
▪ River gravel (rounded)
▪ Bulk oven-dry specific gravity = 2.55
▪ Absorption = 3.6
▪ Oven-dry rodded density = 1761 kg/m3
▪ Moisture content = 2.5
o Fine aggregate:
▪ Natural sand
▪ Bulk oven-dry specific gravity = 2.659
▪ Absorption = 0.5
▪ Moisture content = 2
▪ Fineness modulus = 2.47
o Cement
▪ Type II (Moderate Sulphate Resistant)
▪ Specific Gravity = 3.15
Based on this information, find the following and summarize the findings in a table
d) The amount of fine aggregate (kg)
e) The corrected amount of mixing water (kg).
Step by step
Solved in 9 steps with 17 images
