CCIL Exam WITH QUESTIONS AND ANSWERS 2024

CCIL Exam with questions and answer
Sampling from a mixer/truck agitator- Where is sample taken? - Between 10% and 90%
(Not when testing with Super P)
How is a sample taken when sampling plastic concrete? - 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? - 3
What size sample is needed when casting 3 100mm x 200mm cylinders? - Minimum
20L
What size sample is needed when casting 150mm x 300mm cylinders? - Minimum 30L
What size sample is needed when casting 150mm x 150mm x 535mm beams? -
Minimum 55L
How much extra sample is needed when more than 3 cylinders/specimens are to be
cast? - Volume of the cylinders/specimens plus 10% extra
How much time is allowed for obtaining, transporting and remixing the sample? - 10
minutes
A sample contains aggregate larger than that appropriate for the size of the moulds or
equipment. - It must be wet-sieved prior to testing
Information required on reports - 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 - 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 - 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 - 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? - 3
What temperature is considered stable before mixing concrete? - 23 C - 2 C
Where should cementing materials be stored? - In a dry place, in moisture-proof
containers
What sieve must cementing materials be passed through before use to reject lumps? -
1.25mm or finer
Surface moisture in fine and coarse aggregate should be obtained using samples of
what size? - 500g-1000g
How much time is spent mixing concrete? - Mix 3 minutes, rest 3 minutes, mix 2
minutes
Which sample can be re-used for casting cylinders? - Slump or slump flow, NOT air.
Must be remixed into batch first
Cylinder moulds - Must have nonabsorbent surfaces and be sufficiently rigid- Must be
coated with mineral oil
Cardboard moulds cannot be used for what strength? - Greater than 35MPa
Flexural moulds - Must be rectangular and 50mm longer than the prescribed span. Must
be watertight and rigid, nonabsorbent. Variation from specified cross-section is not to
exceed 3mm. Coat with mineral oil.
Tamping Rod for 100mm x 200mm cylinders - Diameter 10mm - 1mm and a Length of
450mm to 600mm. One end must be hemispherical.
Tamping Rod for cylinders 150mm or greater, and rectangular moulds - Diameter 16mm
- 1mm and a Length 450mm to 600mm. One end must be hemispherical.
Internal Vibrators - Rigi, flexible shaft; powered by electric motor. Frequency 120Hz or
greater. Outside diameter 20mm to 40mm. Minimum height 50mm less than specimen
being consolidated.
Ratio for vibrating cylinders - 4.0 or higher
Vibrating beams - The diameter of the element or thickness of a square vibrating
element shall not exceed 1/3 the width of the mould