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CCIL Certification Exam Questions and Answers
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CCIL Certification Exam Questions and Answers
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CCIL CertificationWhat standard is A23.2-1C? - Answer -Sampling plastic concrete - a test method that specifies the
procedures, location, and sample size required to obtain a representative sample of fresh concrete and
to assess its traceability to the structure it represents (how to obtain a representative sample of fresh
concrete from a truck agitator or mixer
At what discharge points should a fresh concrete sample be taken from a truck agitator or truck mixer? -
Answer -Between the 10% and 90% points of discharge.
When should a fresh concrete sample not be taken from the 10% and 90% points of discharge from a
truck or agitator? - Answer -1) When it is required that concrete be tested for slump immediately prior
to the addition of superplasticizer
2) When precast concrete is produced in a stationary precast mixer
What is a grab sample and when is it used for concrete testing? - Answer -Grab sampling is the
operation of securing at one point of the discharge the required volume of representative material in as
short a period of time as possible.
To evaluate for quality (strength and corresponding related plastic concrete properties) - single grab
sample in specific location
To evaluate for uniformity - three grab samples
When sampling for uniformity of mixed concrete, how many sample should be taken and where? -
Answer -Three grab samples (not to be formed into a composite sample).
Take them from widely separated portions of the batch while the mixer is being completely emptied.
, When collecting samples for uniformity testing in concrete, how should the mixer be operating? -
Answer -- Discharge the concrete at the normal operating rate for the mixer
- Do not obstruct or retard discharge with an incompletely opened gate or seal
- Do not allow the mixer to turn in the mixing direction between samples
- Do not add water to the batch once sampling has started
If you will be casting three 100mm x 200mm cylinders for strength or uniformity testing, how much
sample must be collected? - Answer -A minimum of 20 L of mixed concrete.
If you will be casting three 150mm x 300mm cylinders for strength or uniformity testing, how much
sample must be collected? - Answer -A minimum of 30 L of mixed concrete.
If you will be casting three 150mm x 150mm x 535mm beams for testing, how much sample must be
collected? - Answer -A minimum of 55 L of mixed concrete.
If you are creating more than 3 samples (beams or cylinders), how much more concrete sample do you
need to collect? - Answer -The volume of the extra specimens plus 10%.
Can you reuse concrete from the slump test for other tests? - Answer -Yes.
How should a sample be physically collected from a stream of concrete? - Answer -By passing a
receptacle completely through the discharge stream or by completely diverting the discharge into a
sample container.
When taking a concrete sample, how should the rate of discharge of the batch be decided? - Answer -It
should be regulated by the rate of revolution of the drum and not by the size of the gate opening.
Within what duration of time should a concrete sample be obtained, transported, and remixed for
testing/moulding? - Answer -10 minutes.
What 4 things should a concrete sample be protected from prior to testing/moulding? - Answer -1) Sun
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