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Posted: Thu Nov 29, 2012 5:09 am Post subject: Acceptance criteria of concrete strength
As per the IS 456 Clause 6.1.1, characteristic strength is defined as the strength of materila below which not more than 5 % of the test results are expected to fall.
here 5% of which test results mentioned??
& how much below the Characteristic strength is not mentioned???
And as per the clause 15.4 the individual cube test result variation should not be more than +-15% of the average.
but here also it is not mentioned that how variation is acceptable from the characteristic strength.
(like if we are using M20 and as per the IS 456 clause 15.2.1 we have tested 3 cubes for 5cum. concrete & results are 19,20, 22 and avg. of these is 20.33 then individual variation range as per clause 15.4 (+-15% of avg.) is 17.28 to 23.38 means tes results lies within this range. is it correct???
Now here my test results of M20, how much vary from the M20 is not clear i.e. positive side of 20 & negative side of 20. is it mentioned in any clause of code???
Now wat is relation of characteristic stength definition with these results (below which not more than 5 % of the test results are expected to fall not more than 5% of test results) - kindly explain with above example???
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