ACI CONCRETE FIELD TESTING TECHNICIANS GRADE 1 (IN CANADA), WITH COMPLETE SOLUTION.
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ACI CONCRETE FIELD TESTING TECHNICIANS GRADE 1
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ACI CONCRETE FIELD TESTING TECHNICIANS GRADE 1
ACI CONCRETE FIELD TESTING TECHNICIANS GRADE 1 (IN CANADA), WITH COMPLETE SOLUTION.
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.
procedures, location and samp...
ACI CONCRETE FIELD TESTING TECHNICIANS
GRADE 1 (IN CANADA), WITH COMPLETE SOLUTION.
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.
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.
nature and 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?
False
The concrete sample must be protected at all times from sun, wind,____and
rapid evaporation, contaminants
the minimum size sample for making three 100mm diameter strength test cylinder
specimens is
20l for 100x200mm
The grab sample form a mixer must be obtained between the ____% and ____
%points of the discharge(except when sampling prior to the addition of a super
plasticizer.)
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)
Wet Sieved(over the appropriate sieve size)
When sampling for uniformity of mixed concrete____grab samples shall be
obtained from widely separated portions of the batch during discharge
Three
The temperature of the concrete must be determined within ___ minutes of
obtaining the grab sample.
5 minutes
Air content (pressure method) measurement and slump must both be completed
within ______ minutes after the sample has been transported and remixed.
10 minutes
Moulding of concrete strength cylinders or flexural beams must be completed
within ____minutes after the sample has been transported and remixed.
20 minutes
Air content (volumetric method) must be started within ____ minutes after the
sample has been transported and remixed.
5 minutes
, What document produced by the concrete supplier contains information relating
to identification of the concrete sample?
The delivery ticket
Describe the operation of obtaining a sample for evaluation of concrete quality.
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?
the 10% and 90% points
How is the sample obtained from the discharge stream of a mixer truck?
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?
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
From what conditions must the concrete sample be protected?
Sun, wind, rapid evaporation and contamination
What must be done between taking the sample form the mixer and performing the
test?
Transport the sample to the place where the tests are to be performed
Remix with a shovel
What is the time limit for completion of sampling?
10 minutes
The test for temperature must be completed in how many minutes after obtaining
the sample?
5 minutes
Tests for slump and air content must be completed within how many minutes
after sample has been transported and remixed?
10 minutes
Moulding of strength test specimens must be completed within how many
minutes after sample has been transported and remixed?
20 minutes
CSA A23.2-3C gives standardized procedures for _____and ______ of test
cylinders and flexural test beams from samples of fresh concrete.
making, curing
The tamping rod must be a round, straight steel rod with a diameter of ___mm for
the standard 100mm diameter cylinders
10mm
The sample used for moulding strength test specimens shall be obtained in
accordance with what CSA A23.2 test procedure?
A23.2-1C
Cylinder moulds of 100mm diameter can be used for concrete containing
aggregate with particles up to ____in size
Maximum nominal size of 28mm or less(closest sieve size to 1/3 x 100mm)
The moulding of all test specimens must be completed within____minutes after
the sample has been transported and remixed
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