If fck is characteristic compressive strength of concrete, the flexural and split tensile strength fcr = afck N/mm2 where the value of a is

If fck is characteristic compressive strength of concrete, the flexura

1.	If fck is characteristic compressive strength of concrete, the flexural and split tensile strength fcr = afck N/mm2 where the value of a is
A.	0.4
B.	0.5
C.	0.6
D.	0.7
E.	0.8
Answer» E. 0.8