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Concrete Mix Design Problem 3 - Proportion A Concrete Mix In Metric Units For Basement Floor Slab:
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Design an initial 25 MPa concrete mix design for concrete not subject to severe weathering or sulfate attack to be used for a basement floor slab. Use the following mix ingredients.
Slump: maximum of 100 mm.
Cement: type I non-air entrained cement with specific gravity of 3.15.
Course aggregate: maximum aggregate size of 37.5 mm, specific gravity of 2.68, dry-rodded mass of 1600 kg/m^3, absorbed moisture of 2% and moisture absorption of 0.5%.
Fine aggregate: fineness modulus of 2.8, specific gravity of 2.64, absorbed moisture of 6% and moisture absorption of 0.7%.
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1. From the concrete mix design submenu open the concrete mix design calculation, ConcreteMix.aspx. Input the "Title" of the calculation, the "Designer/Checker" information and the known variables. Note, you do not need to enter the specific gravities for the weight basis calculation.
Next open the design reference and determine the % entrained air, water cement ratio, the course aggregate volume, the mass of water and the estimated mix design mass from the appropriate tables. Check the box for Metric, the button to calculate by "Weight Basis" and click on the "Calculate" button. Read the results.
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2.
Now check the button to calculate by "Volume Basis". Input the specific gravities of the course and fine aggregate, and click on the "Calculate" button. Read the results.
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3. Summary
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The Weight Basis mix design is as follows.
Water: 121.50 kg/m^3
Cement: 291.94 kg/m^3
Course Aggregate: 1158.65 kg/m^3
Fine Aggregate: 849.20 kg/m^3
The Volume Basis mix design is as follows.
Water: 123.10 kg/m^3
Cement: 291.94 kg/m^3
Course Aggregate: 1158.65 kg/m^3
Fine Aggregate: 817.30 kg/m^3
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