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?
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vengalarao

  • Jul 21st, 2011
 

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

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Vikas Bamal

  • 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.

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sushil kumar

  • 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)

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sarvesh9984

  • 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

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VENKATESH

  • 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

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SATYANARAYANA

  • 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

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rupali anjikhane

  • 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 %

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Aravinda Reddy.G

  • Jan 28th, 2013
 

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

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vinoth.N

  • Mar 11th, 2013
 

Yes.

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srinivas

  • Jun 2nd, 2014
 

yes, we should test the cubes for 28 days. Because the concrete gets full strength in 28 days. In 7 days the concrete get only 70% of strength and in 28 days gets 100% of strength.

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devappa bhovi

  • Aug 3rd, 2014
 

To test the compresive strength of cement.

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krishnapraveen

  • Aug 3rd, 2014
 

7 days reaches 66% of that grade
28 days reaches 96% of that grade so we choose only 28 days test

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sai

  • Aug 9th, 2014
 

After 28 days also cube is ok. It depends on curying.

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shashank gaurav

  • Aug 12th, 2014
 

Yes, first the concrete should be tested for compressive strength for 7 days if it is sufficient to bear the load of structure then there is no need to test it for 28 days.

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Sitaram Sharma

  • Sep 24th, 2014
 

Approx 70% strength achieved in 7 days curing, 100% strength achieved after 28 Days curing , so that finally satisfaction for strength will be done after checking of 28 days cube curing.

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krunal

  • Oct 27th, 2014
 

7 day cube result up to 66.67 % & 28 Days result up to 100%
Also All result should be nearest average all result near up to +-15% as per is 456 p29

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vaibhav

  • Oct 29th, 2014
 

7 days cube test given approval of next stage of work you got 60-70% n at 28 days it should be more than hundred % as per std.deviation practically no need but theoretically, you should submitted 28 days report to construction authority for final approval so yes .

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B srikanth

  • Nov 19th, 2014
 

in cube test 25 layers but 6 cubes sample first 3 days one sample 50%,7 days one cube sample is 67%,and 28 day sample is 92 to 95% will to come to result that cubes are preferred.

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