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Question

If characteristic compressive strength at 28 days is 40 N/mm2 and the standard deviation is 5 N/mm2, the target strength at 28 days for concrete mix proportioning

A
40 N/mm2
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B
45 N/mm2
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C
43.25 N/mm2
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D
48.25 N/mm2
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Solution

The correct option is D 48.25 N/mm2
The target mean strength is given as :
fm=fck+1.65σ= 40+1.65×5= 48.25 N/mm2

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