Answer / erwin severino

The answer should be based on ACI 318 chapter 5 Concrete Quality, Placing, And Mixing. Section 5.6.3.3 states that Strength level of a individual class of concrete shall be considered satisfactory if both of the following requirements are met: (a) Every arithmetic average of any three consecutive strength tests equals or exceeds fc' ; (b) No individual strength test(average of two cylinders) falls below fc' more than 500 psi when fc' is 5000 psi or less; or by more than 0.10fc' when fc' is more than 5000 psi.

Answer / rakesh

Bhausaheb Mane's
formula is wrong

1 N = 0.001 kN;
1 kN = 1000 N

Answer / m farooq

How can we say that for 7 days test 70% is necessary..is there any formula

Answer / arunkumar

Area= 7.09*7.09=50.2681*100=5026.81mm^2
Load=10kn loadarea =1.98 nmm^2

Answer / abhinav gupta

after 28 days we can test the cube if compressive machine show
1000kN on 7.09x7.09cm cube thus t he compressive strenth of cube is calculeted by = load/area
e.g 10000/50 = 20

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