Please explain your thought. ! As per IS-456, allowable % age is 15% between three adjacent cubes.
Madhu C N said:
(Sep 8, 2014)
Usually test is repeated if 5% of specimens failed to satisfy the results right.
Pankaj Mehra said:
(Nov 19, 2014)
As per IS 516 Average of three values shall be taken as the representative of the batch provided the Individual variation is not more than ± 15 percent of the average.
Otherwise repeat tests shall be made.
Abhi said:
(Mar 19, 2015)
5% difference is not considered during test. It is the difference of 15%.
Jinx said:
(Aug 14, 2015)
I didn't get the specimens details it is a cement mortar or concrete cubes.
Shivam said:
(Aug 18, 2015)
AS PER IS-456 "The test results of the sample shall be the average of the strength of three specimens".
The individual variation should not be more than +15 percent of the average. If more, the test results of the sample are invalid.
Galelio said:
(Oct 6, 2015)
Question is wrong "Allowable difference can be known if values of compressive strength is know", is 15% of what?
Option should be in %, how you are going to know the value 15kg/cm2. It should be 15%.
Raja said:
(Aug 8, 2016)
I'm agreeing with you complete Galileo.
Uday said:
(Oct 28, 2017)
Strength difference of 15kg/cm2 for 3successive cubes or 5% cubes fails, then test repeated.
Bharaneedharan said:
(Feb 13, 2018)
15kg/mm2 means 1.5N/mm2.
Am I right?
Ashish said:
(May 18, 2018)
The individual variation of test reading should not exceed 15% of the average.
Sagar said:
(Aug 30, 2018)
What action shall be taken if the sample result is invalid based on individual variation is more than 15% despite having the individual test result is 35.17 mpa for M30 grade concrete.
Shall one go for in situ tests?
Please explain me.
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