Answer / jaswinder singh

it is not less than 60% means that it come near about 12kn/mm

Answer / n.rajeev

7 days less than 67.5 %

Answer / ashish sharma

its about 65% of 28 days compressive strength of concrete.
So for 7 days its about 13n/mm2.

Answer / fm irfan

7 days compressive strength should be more then 2/3 of the
M 20 grade concrete that is may be more then 14 MPa(Mega
pascal).....

Answer / samyak jain

7 days compressive strength of concrete would not be less than 67% and it will be 13.5mpa

Answer / aabid

M20 grade of concrete 7 days strength 13.2 kN/ m3 is gain.

Answer / shahnawaz

60% on 7 days ,its 12 kn/mm

Answer / vbhs

17 kn/m2

Answer / eng. mohd noor salleh

75% of 20kn/m2 is required, i.e= 15kn/m2

Answer / sjtbehera

as per Is code- 456-2000 for M20 concete 7days strength
175kg/sqcm or 17.5 kn/sqmm

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