Answer / asif

After 7 days it should achieve 70% strength, and after 28 days it should achieve 120% strength.

Answer / kumaresan

at Seven days, it should be 70% and at 28 days it should be
100%

Answer / shri

at 7 days 2/3 of grade and at 14 days 1/3 of grade

Answer / shalu verma

after 7 days it achieve 70% strenght bt after 28 days it
achieve 85% strenght.

Answer / manoj kumar bhola

AT 7 DAYS STRENGTH WILL BE 67% AND AT 28 DAYS STRENGTH WILL BE 100%

Answer / palavalasa

7 days = 70%
28 days = 95%

Answer / hemanta ku.das.(tuv-sud)

Sp-24,page no-20 ,give this formula to find out the different grade of concrete for different age

t
Ft = ............... *F28
a+ (b*t)

a=4.7,b=0.833. constant
t=time period,(days)
F28=grade of concrete.

Answer / lalit kumar singh

Strength of cube in

07 days - 67%
28days - 85-90 %

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