Civil Engineering - Concrete Technology - Discussion
Discussion Forum : Concrete Technology - Section 1 (Q.No. 34)
34.
The preliminary test is repeated if the difference of compressive strength of three test specimens, exceeds
Discussion:
13 comments Page 1 of 2.
Sandesh Nepal said:
4 years ago
As per IS code, the average compressive strength of three values shall be taken as the representative of batch provided the individual variation is not more than 15% of the average strength or difference of 1.5 N/mm2 or 5% cubes fails. Then the test is repeated.
(1)
Sagar said:
7 years ago
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.
Shall one go for in situ tests?
Please explain me.
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.
The individual variation should not be more than +15 percent of the average. If more, the test results of the sample are invalid.
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.
Otherwise repeat tests shall be made.
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%.
Option should be in %, how you are going to know the value 15kg/cm2. It should be 15%.
Amitgoel said:
1 decade ago
Please explain your thought. ! As per IS-456, allowable % age is 15% between three adjacent cubes.
Uday said:
8 years ago
Strength difference of 15kg/cm2 for 3successive cubes or 5% cubes fails, then test repeated.
Madhu C N said:
1 decade ago
Usually test is repeated if 5% of specimens failed to satisfy the results right.
Ashish said:
7 years ago
The individual variation of test reading should not exceed 15% of the average.
Jinx said:
1 decade ago
I didn't get the specimens details it is a cement mortar or concrete cubes.
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