Exam (elaborations)
CCIL TEST QUESTIONS AND CORRECT ANSWERS
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CCIL TEST QUESTIONS AND CORRECT ANSWERS
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CCIL TESTSampling from a mixer/truck agitator- Where is sample taken? - Answer -Between 10% and 90% (Not
when testing with Super P)
How is a sample taken when sampling plastic concrete? - Answer -Either pass a receptacle completely
through a discharge stream OR divert a discharge stream completely into a sampling container.
How many grab samples are needed when testing for uniformity of samples? - Answer -3
What size sample is needed when casting 3 100mm x 200mm cylinders? - Answer -Minimum 20L
What size sample is needed when casting 150mm x 300mm cylinders? - Answer -Minimum 30L
What size sample is needed when casting 150mm x 150mm x 535mm beams? - Answer -Minimum 55L
How much extra sample is needed when more than 3 cylinders/specimens are to be cast? - Answer -
Volume of the cylinders/specimens plus 10% extra
How much time is allowed for obtaining, transporting and remixing the sample? - Answer -10 minutes
, A sample contains aggregate larger than that appropriate for the size of the moulds or equipment. -
Answer -It must be wet-sieved prior to testing
Information required on reports - Answer -Conc mix no, Sample source, Batch time/date, Sample
time/date, Project site, Sample location if different, Location of conc in structure, Technician name, Lab
name/address, Signature of test report reviewer, Any deviation from test procedures
Air Content - Answer -The volume of air voids of plastic concrete, exclusive of pore space in aggregate
particles, determined through observations of the change of air volume in concrete with a change in
pressure.
Slump - Answer -A measure of consistency of freshly mixed hydraulic cement concrete, equal to the
subsidence, measured to the next 5mm, of the moulded substance immediately after the removal of the
slump cone
Slump Flow - Answer -The horizontal spread of concrete immediately upon removal of the slump cone
as a measure of the unconfined fluidity of concrete giving a relative degree of indication of the degree to
which concrete can travel
How many water-to-cementing materials ratios are needed for concrete trial mixes? - Answer -3
What temperature is considered stable before mixing concrete? - Answer -23 C +/- 2 C
Where should cementing materials be stored? - Answer -In a dry place, in moisture-proof containers
What sieve must cementing materials be passed through before use to reject lumps? - Answer -1.25mm
or finer
Surface moisture in fine and coarse aggregate should be obtained using samples of what size? - Answer -
500g-1000g
How much time is spent mixing concrete? - Answer -Mix 3 minutes, rest 3 minutes, mix 2 minutes
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