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Cube tests of concrete are failed at 7 days and 28 
days.What is your next action?
 Question Submitted By :: Civil-Engineering
I also faced this Question!!     Answer Posted By  
# 1
Is This Answer Correct ?    47 Yes 10 No
# 2
ensist contractor to hold skilled man power with quallity
material. note the result in daily work progress and mark
on structure which is not as per specification. finally go
for NDT if also structure fails then we have to demolish &
reconstruct the same
Is This Answer Correct ?    33 Yes 6 No
# 3
Any is code not give the clause regarding demolishing of
structure if cube fails in 28 days. but IS 456 & 516 give
the clause if strength of cube is less than FCK then
proceed for NDT Test i.e Rebound hammer if fail then go for
Ultrasonic test after all the NDT fail then proceed for
Core cutter also if U found result less then FCK then go
for Retrofitting with suggestion of consultant.
Is This Answer Correct ?    21 Yes 1 No
Vaibhav Jadhav
# 4
Go for NDTest, if it is not satisfied go for Core test that
is also failed go for concrete strengthing process As per
structural consultant comments
Is This Answer Correct ?    15 Yes 2 No
# 5
Well. When Concrete cube test result fails at 28th day then
go for concrete core cutting and check the compressive
strength in it. Number of cores shall be as per the
engineer incharge's decision but should not be less than 3
nos. IS:456 says if the core test fails then go for load
test. IS : 456 also says that NDT can be done . But with
rebound hammer test only surface hardness will be known and
hence this test result is not reliable and hardly anyone
suggests for this test.
Is This Answer Correct ?    13 Yes 2 No
# 6
Use concrete tester rebound hammer for strength after
Perform test as per standard,if results is more than 100 %
of requirement by calibration graph of hammer continue the
Is This Answer Correct ?    9 Yes 1 No
# 7
NDT testing has to be done and if it fails then go for
recto method that is strengthing of concrete and concern is
not demolish it's time taken and it will effect time and
Is This Answer Correct ?    7 Yes 4 No
# 8
Go for NDT If it is not satisfied go for Core test that
is also failed go for there possibale demolisan that coloum
it is not possible we go for Restrengthing.
Is This Answer Correct ?    1 Yes 1 No
Prabhakara Rao.b

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