Answer / chandarsaras

66% of 20 or 25 or 30

Answer / elango

66.7 percent

Answer / sumit

This grade is design mix so Target strenth is Fck+4
for M20 (20+4=24) Means 24N/MM2

So Compressive strenth in 7 days will come is 16.24N/MM2

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Answer / gulshan kamboj

it is 67%. but practically should varies between 70 to 75%.

Answer / ilavarasan.g

70%

Answer / aijaz hussain, modi builders

Mix 7 Days compressive strength

M20 175 kg/sq.cm.

M25 210 kg/sq.cm

M30 365 kg/sq.cm.

Answer / vimal prajapati

in 7 dayas 70% min. compressive strength required

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