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Civil Engineering - Concrete Technology - Discussion

Discussion Forum : Concrete Technology - Section 1 (Q.No. 34)
Concrete Technology
34.
The preliminary test is repeated if the difference of compressive strength of three test specimens, exceeds
5 kg/cm2
8 kg/cm2
10 kg/cm2
12 kg/cm2
15 kg/cm2
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
13 comments Page 1 of 2.
Amitgoel said:   1 decade ago
Please explain your thought. ! As per IS-456, allowable % age is 15% between three adjacent cubes.
Madhu C N said:   1 decade ago
Usually test is repeated if 5% of specimens failed to satisfy the results right.
Pankaj mehra said:   1 decade ago
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:   1 decade ago
5% difference is not considered during test. It is the difference of 15%.
Jinx said:   1 decade ago
I didn't get the specimens details it is a cement mortar or concrete cubes.
SHIVAM said:   1 decade ago
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:   10 years ago
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:   9 years ago
I'm agreeing with you complete Galileo.
Uday said:   8 years ago
Strength difference of 15kg/cm2 for 3successive cubes or 5% cubes fails, then test repeated.
BHARANEEDHARAN said:   8 years ago
15kg/mm2 means 1.5N/mm2.

Am I right?
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