The maximum compressive strength on 15 cm cubes of 20 grade concrete – McqOptions

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1.	The maximum compressive strength on 15 cm cubes of 20 grade concrete at 7 days, should be a minimum of
A.	7 N/mm
B.	10 N/mm
C.	15 N/mm
D.	20 N/mm
Answer» C. 15 N/mm

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