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# Cube test

I am casting Raft and get the cube .after seven days test the cube that was pass as per rule so i will testing after 28 day ? yes or no? and why?
vengalarao

Answered On : Jul 21st, 2011

As compressive strength for concrete will reach on 7th day of curing and 28th day of curing so test is compulsorily

Vikas Bamal

Answered On : Aug 31st, 2011

Yes, I will testing the cubes after passing the 7 days compressive strength.
Because the concrete is properly hardened in 28 days curing.

sushil kumar

Answered On : Sep 4th, 2011

Yes, because after 28 days concrete should achieved characteristic strength. That is why it is necessary to conduct the test for 28 days (as per is code 456)

sarvesh9984

Answered On : Jun 13th, 2012

As per rule you have to calculate there 28th days strength, but in practical if 7th day test is passed there is no need to calculate 28th day strength

VENKATESH

Answered On : Sep 4th, 2012

cube test is for finding the compressive strength of concrete.concrete gets complete strength after 28 days of curing.generally m15 grade concrete gets compressive strength of 15N/mm^2 after 28days .for 7days compressive strength of concrete is 2/3 strength of 28 days

SATYANARAYANA

Answered On : Sep 14th, 2012

The test results of 7 days only represent the rate of gain of characteristic strength of concrete merely to understand at a premature date. As the concrete gains the strength with age 28 days results will gives & decides a perfect idea to know the strength whether to know the test results will fall well within or not. so 28days are more reliable than 7 days.
in some cases 7days early strength may be more than generally specifies 60-70% of characteristic strength.
If it more then rate of heat liberation due to hydration can reduce the strength at 28 days.

This the reason behind

rupali anjikhane

Answered On : Jan 19th, 2013

Yes We must check its strength after 28 days, or curing would be done for 28 days because concrete achieve its maximum strength after 28 days nearly about 95-98 %

Aravinda Reddy.G

Answered On : Jan 28th, 2013

After 28 days of curing cubes will be tested for the maximum strength gain i,e >28mpa.

vinoth.N

Answered On : Mar 11th, 2013

Yes.