Design a concrete mix for the following conditions and constraints using the Absolute Volume Method. The material description are as follows: I. Design Environment i. Retaining Wall exposed to moderate sulfate exposure ii. Required Design Compressive Strength = 27.6 MPa iii. Standard Deviation of Compressive Strength of 1.8 MPa is expected (25 sample only) iv. Minimum dimension = 200 mm v. Minimum space between re-bars = 50 mm vi. Minimum cover over re-bars = 50 mm vii. Maximum Slump is required viii. Only air entrained is allowed II. Available Materials i. Air Entrained – Manufacture Specification 5.5ml/1% air/100 kg cement (use maximum or +2% air content) ii. Coarse Aggregates 25 mm Nominal Maximum Aggregate Size Rounded River Gravel (Note: apply water content reduction) Bulk Oven-dry specific gravity = 2.65 Absorption = 0.2% Moisture Content = 1.4% Oven-dry Rodded Density = 1565 kg/m3 iii. Fine Aggregates Natural Sand Bulk Oven-dry specific gravity = 2.70 Absorption = 0.7% Moisture Content = 1.6% Fineness Modulus = 2.60 Determine the following: a. Type of cement to be used. b. The strength requirement. c. The water-cement ratio requirement. d. The coarse aggregate requirement. e. The air content requirement. f. The workability requirement. g. The water content requirement. h. The cementing materials content requirement. i. The admixture requirement. j. The fine aggregate requirement. k. The moisture corrections
Design a concrete mix for the following conditions and constraints using the Absolute Volume Method. The material description are as follows:
I. Design Environment
i. Retaining Wall exposed to moderate sulfate exposure
ii. Required Design Compressive Strength = 27.6 MPa
iii. Standard Deviation of Compressive Strength of 1.8 MPa is expected (25 sample only)
iv. Minimum dimension = 200 mm
v. Minimum space between re-bars = 50 mm
vi. Minimum cover over re-bars = 50 mm
vii. Maximum Slump is required
viii. Only air entrained is allowed
II. Available Materials
i. Air Entrained – Manufacture Specification 5.5ml/1% air/100 kg cement (use maximum or +2% air content)
ii. Coarse Aggregates
25 mm Nominal Maximum Aggregate Size
Rounded River Gravel (Note: apply water content reduction)
Bulk Oven-dry specific gravity = 2.65
Absorption = 0.2%
Moisture Content = 1.4%
Oven-dry Rodded Density = 1565 kg/m3
iii. Fine Aggregates
Natural Sand
Bulk Oven-dry specific gravity = 2.70
Absorption = 0.7%
Moisture Content = 1.6%
Fineness Modulus = 2.60
Determine the following:
a. Type of cement to be used.
b. The strength requirement.
c. The water-cement ratio requirement.
d. The coarse aggregate requirement.
e. The air content requirement.
f. The workability requirement.
g. The water content requirement.
h. The cementing materials content requirement.
i. The admixture requirement.
j. The fine aggregate requirement.
k. The moisture corrections
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