Answer / tushar

standard deviation

Answer / s r s

Fck- Characterstics Strength of Concrete
4- Standard Deviation for M20 and M25 Grade of Concrete according to IS 456:2000 Page:23

Answer / sjtbehera

ok fck is the 28 days compressive strength
s is the standard deviation
t is a static value

valu of s is M10 to M20=3.5
M20 to M35=4
M40 to M50=5.o

Answer / ranjan

standard deviation only for M-20 & M-25

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