If characteristic compressive strength at 28 days is 40N/mm2 and the standard deviation is 5N/mm2, the target strength at 28 days for concrete mix proportioning
A
40N/mm2
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
45N/mm2
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
43.25N/mm2
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
48.25N/mm2
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
Open in App
Solution
The correct option is D48.25N/mm2 The target mean strength is given as : fm=fck+1.65σ=40+1.65×5=48.25N/mm2