ACI Concrete Field Testing Technician-
Grade I
A 6 by 12 in [150 mm by 300 mm] cylinder mold can be used for concrete containing
aggregate with particles not exceeding _____ in size, without the need for wet sieving
the concrete. - ANS-2 in. [50 mm]
A composite sample of concrete is required even if the only purpose for obtaining the
sample is to determine temperature. True of False? - ANS-False
A mallet weighing ____ must be used to tap the sides of the bowl after rodding each
layer. - ANS-1.25 +- 0.50 lb. (600 +- 200 g)
A maximum temperature of freshly mixed concrete is specified in ASTM C1064. True of
False? - ANS-False
A plastic container can be used for the measure in this method. True or False? -
ANS-False, measure must be steel or another suitable metal
According to ASTM C1064, what is one reason to take the temperature of concrete? -
ANS-Verify conformance to a specified requirement for temperature of concrete
After completing the strike-off procedure, what must be done before weighing the
measure and sample? - ANS-Clean off any excess concrete
After consolidation of the final layer, an excess of concrete ____ above the top of the
measure is considered optimum. - ANS-1/8 in. [3 mm]
After molding test specimens, you should wait two hours before moving them to the
location of initial storage. True or False? - ANS-False; the specimens must be moved
immediately
After rodding each layer, what should be done to the measure before adding another
layer of concrete? - ANS-Tap the sides of the measure smartly 10 to 15 times with the
mallet
After the final rodding, the sides of the slump mold should should be tapped lightly with
the tamping rod. True or False? - ANS-False
, After the temperature of the concrete is read, what is required? - ANS-Reporting of
temperature
Air meter bowls used for this test must conform to ASTM _____ and be calibrated for
volumee according to ASTM _____. - ANS-C231, C29
ASTM Method gives standardized requirements for _____, _____, _____, and _____, of
test specimens. - ANS-Making, curing, protecting, transporting
At the end of the procedure, the air meter is _____. - ANS-Disassembled and its
contents examined
Concrete mixtures with specified strengths of 6000 psi [40 MPa] or greater shall have
an initial curing temperature between __________. - ANS-68 and 78 degrees F [20 and
26 C]
Concrete samples from a truck mixer must be obtained before any water or admixtures
are added to the mixer at the job site. True or False? - ANS-False
Cylinders made for the purpose of determining when a structure may be put into service
shall be removed from the mold __________. - ANS-At the time of the removal of
formwork
Cylinders that are to be field cured are stored __________ and protected __________. -
ANS-In or on the structure as near to the point of deposit of the concrete represented as
possible; In as near as possible the same way as the formed work
During transportation, test specimens must be protected from damage due to _____,
_____, and _____. - ANS-Jarring, freezing temperatures, moisture loss
Each layer should fill approximately _____ the volume of the mold. - ANS-One-third
Field Curing is the curing method used when test specimens are to be used for
__________. - ANS-Determination of whether the structure is capable of being put into
service; Comparison with standard cured specimens test results or with results from
various in-place test methods; Adequacy of curing and protection of concrete in the
Structure, or Form or shoring removal time requirements
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