Mathematics · Concrete Mix Design Calculations
A concrete mix is being designed for a characteristic compressive strength (fck) of 20 N/mm2. According to IS 456 : 2000 guidelines, if the standard deviation for the production quality is assumed to be S = 4.0 N/mm2, what is the required target mean compressive strength (fm) for the mix design?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 132 N/mm2
- 230 N/mm2
- 326.6 N/mm2✓
- 420 N/mm2
Correct answer
26.6 N/mm2
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