Mathematics · Concrete Mix Design Calculations
If the characteristic compressive strength (fck) at 28 days is 25 N/mm2 and the standard deviation is 5.3 N/mm2, what will be the target mean strength (f'ck) for the desired mix design? (Assume standard factor of 1.65)
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 140.50 N/mm2
- 238.80 N/mm2
- 330.12 N/mm2
- 433.75 N/mm2✓
Correct answer
33.75 N/mm2
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