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 contai...
CCIL Exam Study Guide
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
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