Answer / bidyut dey

1.after 28 days it will be attained 30 N/MM2
2.Terget mean strength

Answer / ganaaji harsha

M30
Target strength for mix proportioning
f’ck = fck 1.65 s
Where
f’ck = Target average compressive strength at 28 days,
fck = Characteristic compressive strength at 28 days,
s= Standard deviation
From Table 1 standard deviation, s = 5 N/mm2
Therefore target strength = 30 1.65 x 5 = 38.25 N/mm2.


Target Mean Strength for M30 ( IS 456)
Fck 0.825*Standard Deviation

30 0.825*5

34.12

Answer / swapnil

After 28 days Strength FOr M30 IS 34 N/mm2

Answer / chandrasekhar j

1.30 n/mm2
2.it is target mean strength

Answer / wasim

30N/mm2

Answer / shubham singh

1: M30
Target strength for mix proportioning
f’ck = fck + 1.65 s
Where
f’ck = Target average compressive strength at 28 days,
fck = Characteristic compressive strength at 28 days,
s= Standard deviation = 5 (IS 10262:2009, table 1)
From Table 1 ( IS 10262:2009, Clause 3.2)
f’ck = 30 + 1.65 * 5
= 38.25 N/mm2
2: It should attain target mean strength

Answer / aditya mayekar

1.after 28 days it will be attained 30 N/MM2
2.Terget mean strength

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