ACI Concrete Field-Testing Technician Questions
with Completely Verified Answers
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. -
Correct Answers-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? - Correct Answers-False
A mallet weighing ____ must be used to tap the sides of the bowl after rodding each layer. -
Correct Answers-1.25 +- 0.50 lb. (600 +- 200 g)
A maximum temperature of freshly mixed concrete is specified in ASTM C1064. True of False? -
Correct Answers-False
A plastic container can be used for the measure in this method. True or False? - Correct
Answers-False, measure must be steel or another suitable metal
According to ASTM C1064, what is one reason to take the temperature of concrete? -
Correct Answers-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? - Correct Answers-Clean off any excess concrete
After consolidation of the final layer, an excess of concrete ____ above the top of the measure is
considered optimum. - Correct Answers-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? - Correct Answers-False; the specimens must be moved
immediately
After rodding each layer, what should be done to the measure before adding another layer of
concrete? - Correct Answers-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? - Correct Answers-False
, After the temperature of the concrete is read, what is required? - Correct Answers-Reporting
of temperature
Air meter bowls used for this test must conform to ASTM _____ and be calibrated for volumee
according to ASTM _____. - Correct Answers-C231, C29
ASTM Method gives standardized requirements for _____, _____, _____, and _____, of test
specimens. - Correct Answers-Making, curing, protecting, transporting
At the end of the procedure, the air meter is _____. - Correct Answers-Disassembled and its
contents examined
Concrete mixtures with specified strengths of 6000 psi [40 MPa] or greater shall have an initial
curing temperature between __________. - Correct Answers-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? - Correct Answers-False
Cylinders made for the purpose of determining when a structure may be put into service shall
be removed from the mold __________. - Correct Answers-At the time of the removal of
formwork
Cylinders that are to be field cured are stored __________ and protected __________. -
Correct Answers-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 _____. - Correct Answers-Jarring, freezing temperatures, moisture loss
Each layer should fill approximately _____ the volume of the mold. - Correct Answers-One-
third
Field Curing is the curing method used when test specimens are to be used for __________. -
Correct Answers-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
For a measure of 0.5 ft^3 [14 L], what is the required number of strokes of the tamping rod for
consolidation of each layer? - Correct Answers-25
with Completely Verified Answers
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. -
Correct Answers-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? - Correct Answers-False
A mallet weighing ____ must be used to tap the sides of the bowl after rodding each layer. -
Correct Answers-1.25 +- 0.50 lb. (600 +- 200 g)
A maximum temperature of freshly mixed concrete is specified in ASTM C1064. True of False? -
Correct Answers-False
A plastic container can be used for the measure in this method. True or False? - Correct
Answers-False, measure must be steel or another suitable metal
According to ASTM C1064, what is one reason to take the temperature of concrete? -
Correct Answers-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? - Correct Answers-Clean off any excess concrete
After consolidation of the final layer, an excess of concrete ____ above the top of the measure is
considered optimum. - Correct Answers-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? - Correct Answers-False; the specimens must be moved
immediately
After rodding each layer, what should be done to the measure before adding another layer of
concrete? - Correct Answers-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? - Correct Answers-False
, After the temperature of the concrete is read, what is required? - Correct Answers-Reporting
of temperature
Air meter bowls used for this test must conform to ASTM _____ and be calibrated for volumee
according to ASTM _____. - Correct Answers-C231, C29
ASTM Method gives standardized requirements for _____, _____, _____, and _____, of test
specimens. - Correct Answers-Making, curing, protecting, transporting
At the end of the procedure, the air meter is _____. - Correct Answers-Disassembled and its
contents examined
Concrete mixtures with specified strengths of 6000 psi [40 MPa] or greater shall have an initial
curing temperature between __________. - Correct Answers-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? - Correct Answers-False
Cylinders made for the purpose of determining when a structure may be put into service shall
be removed from the mold __________. - Correct Answers-At the time of the removal of
formwork
Cylinders that are to be field cured are stored __________ and protected __________. -
Correct Answers-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 _____. - Correct Answers-Jarring, freezing temperatures, moisture loss
Each layer should fill approximately _____ the volume of the mold. - Correct Answers-One-
third
Field Curing is the curing method used when test specimens are to be used for __________. -
Correct Answers-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
For a measure of 0.5 ft^3 [14 L], what is the required number of strokes of the tamping rod for
consolidation of each layer? - Correct Answers-25
