Question
Download Solution PDFAccording to IS 456-2000, in the method of design mix concrete for an RCC structure, what will be the target mean strength of concrete if the mean characteristic strength is 35MPa with a standard deviation of 6 N/mm2?
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 = 35 N/mm2
σ = 6 N/mm2
Target mean strength is:
fcm = fck + (1.65 × σ)
fcm = 35 + (1.65 × 6)
fcm = 44.9 N/mm2
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