Question
Download Solution PDFIf standard deviation is 4 N/mm2, the target mean strength of M20 concrete should be
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
The correct expression as per IS 456: 2000 to find Target mean strength is:
fcm = fck + (1.65 × σ)
fcm = Target mean strength
fck = Characteristic strength
σ = Standard deviation
1.65 is generally a risk factor
Calculations:
fck = 20 N/mm2
σ = 4.0 N/mm2
Target mean strength is:
fcm = fck + (1.65 × σ)
fcm = 20 + (1.65 × 4)
fcm = 26.6 N/mm2
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