ACI Concrete Field Testing Technician
- Grade 1 (Canada)15
The standard practice describes the _____ _____ and _____ required to obtain a representative
sample of fresh concrete and to assess its tractability to the structure it represents. - ANSWERS-
procedures, location and sample size
The procedures used in sampling shall include the use of every precaution that will assist in
obtaining samples that are truly representative of the _____and _______ of the concrete. -
ANSWERS-nature, conditions
Intermittent scooping of the sample in shovelfuls or bucketfuls into a wheelbarrow or tray as
the concrete continues to flow down the delivery chute is an acceptable technique? -
ANSWERS-False
The concrete sample must be protected at all times from sun, wind,____and - ANSWERS-rapid
evaporation, contaminants
the minimum size sample for making strength test cylinder specimens is - ANSWERS-20l for
100x200mm
30l for 150x300mm
55l when 3 flexural beams are made
When sampling for uniformity of mixed concrete____grab samples shall be obtained from
widely separated portions of the batch during discharge - ANSWERS-Three
The sample form a mixer must be obtained between the ____% and ____%points of the
discharge - ANSWERS-10, 90
, When the concrete contains aggregate whose nominal size is larger than that permitted for a
particular test method, the sample of concrete must be _____before making the test(except for
Density tests) - ANSWERS-Wet Sieved(over the appropriate sieve size)
Air content (pressure method) measurement and slump must both be completed
within___minutes of transporting and remixing of the sample - ANSWERS-10
Moulding of concrete strength cylinders must b e completed within____minutes after the
sample has been transported and remied. - ANSWERS-20
What document produced by the concrete supplier contains information relating to
identification of the concrete sample? - ANSWERS-The delivery ticket
Describe the operation of obtaining a sample for evaluation of concrete quality. - ANSWERS-
Obtain a single grab sample at one point of the discharge in as short a time as possible.
Between what two points of the mixer discharge must the concrete be sampled? - ANSWERS-
the 10% and 90% points
How is the sample obtained from the discharge stream of a mixer truck? - ANSWERS-Pass the
receptacle completely through discharge stream OR completely divert discharge stream into
sample container.
What is the minimu size of sample to be obtained when strength test specimens are to be
moulded? - ANSWERS-20l when 100dia x 200mm cylinder are made
30l when 150dia x 300mm cylinders are made
55l when three flexural beams are to be made
- Grade 1 (Canada)15
The standard practice describes the _____ _____ and _____ required to obtain a representative
sample of fresh concrete and to assess its tractability to the structure it represents. - ANSWERS-
procedures, location and sample size
The procedures used in sampling shall include the use of every precaution that will assist in
obtaining samples that are truly representative of the _____and _______ of the concrete. -
ANSWERS-nature, conditions
Intermittent scooping of the sample in shovelfuls or bucketfuls into a wheelbarrow or tray as
the concrete continues to flow down the delivery chute is an acceptable technique? -
ANSWERS-False
The concrete sample must be protected at all times from sun, wind,____and - ANSWERS-rapid
evaporation, contaminants
the minimum size sample for making strength test cylinder specimens is - ANSWERS-20l for
100x200mm
30l for 150x300mm
55l when 3 flexural beams are made
When sampling for uniformity of mixed concrete____grab samples shall be obtained from
widely separated portions of the batch during discharge - ANSWERS-Three
The sample form a mixer must be obtained between the ____% and ____%points of the
discharge - ANSWERS-10, 90
, When the concrete contains aggregate whose nominal size is larger than that permitted for a
particular test method, the sample of concrete must be _____before making the test(except for
Density tests) - ANSWERS-Wet Sieved(over the appropriate sieve size)
Air content (pressure method) measurement and slump must both be completed
within___minutes of transporting and remixing of the sample - ANSWERS-10
Moulding of concrete strength cylinders must b e completed within____minutes after the
sample has been transported and remied. - ANSWERS-20
What document produced by the concrete supplier contains information relating to
identification of the concrete sample? - ANSWERS-The delivery ticket
Describe the operation of obtaining a sample for evaluation of concrete quality. - ANSWERS-
Obtain a single grab sample at one point of the discharge in as short a time as possible.
Between what two points of the mixer discharge must the concrete be sampled? - ANSWERS-
the 10% and 90% points
How is the sample obtained from the discharge stream of a mixer truck? - ANSWERS-Pass the
receptacle completely through discharge stream OR completely divert discharge stream into
sample container.
What is the minimu size of sample to be obtained when strength test specimens are to be
moulded? - ANSWERS-20l when 100dia x 200mm cylinder are made
30l when 150dia x 300mm cylinders are made
55l when three flexural beams are to be made
