Answer / shaikh moyunuddin

concrete strength process timing is 1 year
after 28 days concrete gets 90% strength
then
for - M15=1:2:4=15+1.5=16.5 n/mm^2
for - M20=1:1.5:3=20+2=22 n/mm^2
for - M25=1:1:2=25+2.5=27.5 n/mm^2

& above the m25 grade,that is Based on design mix per IS.
for find strength of above m25 grade strength=concrete strength after 28 days+10%strength of concrete getting strength after 28 days


getting m45 grade strength laboratry test used
ther generally cement ratio increased & test & test till geting m45 strength

Answer / goutam giri

It gains 100% strength after full curing (fully immersed in water)

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