CCIL UPDATED Exam Questions and
CORRECT Answers
Sampling from a mixer/truck agitator- Where is sample taken? - CORRECT Answer-
Between 10% and 90% (Not when testing with Super P)
How is a sample taken when sampling plastic concrete? - CORRECT 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? - CORRECT
Answer- 3
What size sample is needed when casting 3 100mm x 200mm cylinders? - CORRECT
Answer- Minimum 20L
What size sample is needed when casting 150mm x 300mm cylinders? - CORRECT Answer-
Minimum 30L
What size sample is needed when casting 150mm x 150mm x 535mm beams? - CORRECT
Answer- Minimum 55L
How much extra sample is needed when more than 3 cylinders/specimens are to be cast? -
CORRECT Answer- Volume of the cylinders/specimens plus 10% extra
How much time is allowed for obtaining, transporting and remixing the sample? - CORRECT
Answer- 10 minutes
A sample contains aggregate larger than that appropriate for the size of the moulds or
equipment. - CORRECT Answer- It must be wet-sieved prior to testing
Information required on reports - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT 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? -
CORRECT Answer- 3
What temperature is considered stable before mixing concrete? - CORRECT Answer- 23 C
+/- 2 C
Where should cementing materials be stored? - CORRECT Answer- In a dry place, in
moisture-proof containers
What sieve must cementing materials be passed through before use to reject lumps? -
CORRECT Answer- 1.25mm or finer
Surface moisture in fine and coarse aggregate should be obtained using samples of what size?
- CORRECT Answer- 500g-1000g
How much time is spent mixing concrete? - CORRECT Answer- Mix 3 minutes, rest 3
minutes, mix 2 minutes
Which sample can be re-used for casting cylinders? - CORRECT Answer- Slump or slump
flow, NOT air. Must be remixed into batch first
CORRECT Answers
Sampling from a mixer/truck agitator- Where is sample taken? - CORRECT Answer-
Between 10% and 90% (Not when testing with Super P)
How is a sample taken when sampling plastic concrete? - CORRECT 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? - CORRECT
Answer- 3
What size sample is needed when casting 3 100mm x 200mm cylinders? - CORRECT
Answer- Minimum 20L
What size sample is needed when casting 150mm x 300mm cylinders? - CORRECT Answer-
Minimum 30L
What size sample is needed when casting 150mm x 150mm x 535mm beams? - CORRECT
Answer- Minimum 55L
How much extra sample is needed when more than 3 cylinders/specimens are to be cast? -
CORRECT Answer- Volume of the cylinders/specimens plus 10% extra
How much time is allowed for obtaining, transporting and remixing the sample? - CORRECT
Answer- 10 minutes
A sample contains aggregate larger than that appropriate for the size of the moulds or
equipment. - CORRECT Answer- It must be wet-sieved prior to testing
Information required on reports - CORRECT 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 - CORRECT 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 - CORRECT 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 - CORRECT 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? -
CORRECT Answer- 3
What temperature is considered stable before mixing concrete? - CORRECT Answer- 23 C
+/- 2 C
Where should cementing materials be stored? - CORRECT Answer- In a dry place, in
moisture-proof containers
What sieve must cementing materials be passed through before use to reject lumps? -
CORRECT Answer- 1.25mm or finer
Surface moisture in fine and coarse aggregate should be obtained using samples of what size?
- CORRECT Answer- 500g-1000g
How much time is spent mixing concrete? - CORRECT Answer- Mix 3 minutes, rest 3
minutes, mix 2 minutes
Which sample can be re-used for casting cylinders? - CORRECT Answer- Slump or slump
flow, NOT air. Must be remixed into batch first
