ACI CONCRETE FIELD TESTING TECHNICIAN
- GRADE I TEST EXAM| ALL QUESTIONS WITH
CORRECT ANSWERS| ALREADY GRADED A+
What must be done if there is an excessive amount of concrete in measure
following consolidation of the final layer? - ANSWER: Remove a representative
quantity of concrete with the scoop or trowel before the strike off
The volumetric method of determining air content of concrete can be used on
concrete containing what types of aggregate? - ANSWER: All types of aggregate
What are the requirements for the tamping rod used in the test method? -
ANSWER: Round, straight 5/8 [16 mm] +- 1/16 in. [2 mm] diameter rod at least 5
in. [300 mm] greater in length than the depth of the bowl being used, with the
tamping end rounded to a hemispherical tip of the same diameter, made of steel,
high-density polyethylene, or other plastic of equal or greater abrasion resistance.
What are the requirements for the strike-off bar used in this test method? -
ANSWER: Flat, straight steel bar at least 1/8 by 3/4 by 12 in. [3 by 20 by 300
mm] or a 4.4 flat, straight high-density polyethylene bar, or other plastic of equal
or greater abrasion resistance, at least 1/4 by 3/4 by 23 in [6 by 30 by 300 mm].
What is the approximate volume of the measuring cup used to add water to the air
meter, in relation to the volume of the air meter bowl? - ANSWER: 1.00% +-
0.04%
What type of alcohol and concentration must be used in this test method? -
ANSWER: Isopropyl, 70% by volume (65% by weight)
,A mallet weighing must be used to tap the sides of the bowl after rodding
each layer. - ANSWER: 1.25 +- 0.50 lb. (600 +- 200 g)
The sample of concrete used in this test method must be obtained in accordance
with what ASTM Standard? - ANSWER: C172
The maximum size aggregate allowed in this test method is . - ANSWER: 1
1/2 in. (37.5 mm)
If the concrete sample contains aggregate larger than that allowed for this test, the
sample must be . - ANSWER: Wet sieved over a 1-in. (25-mm) sieve
When filling the bowl of the air meter, the concrete must be placed in layers
of equal depth. - ANSWER: 2
What is the specified number of strokes required when rodding each layer of
concrete? - ANSWER: 25
It is necessary to tap the sides of the bowl after each layer has been rodded. True or
False? - ANSWER: True
The initial quantity of water and alcohol added to the air meter can be poured
directly into the neck of the top section of the air meter. True or False? -
ANSWER: False; the funnel must be used
Upon final filling of the air meter with water, what part of the liquid level should
be adjusted to the zero mark on the meter? - ANSWER: Bottom of the meniscus
,How long should the air meter be inverted and agitated? - ANSWER: No more
than five seconds at a time, but must be repeated for a minimum of 45 seconds to
free concrete from the base
How many times does the rolling operation occur? - ANSWER: A minimum of 2,
a minimum of 3
Why is the isopropyl alcohol added to the meter? - ANSWER: To dispel any foam
that may be on the surface of the water
The direct reading of the final liquid level in the neck of the air meter, is estimated
to the nearest . - ANSWER: 0.25%
If the air content is greater than the 9% range of the meter, . - ANSWER:
Calibrated cups of water are added to ring the liquid level within the graduated
range
In order for an initial meter reading to be valid, the meter must not be leaking, the
liquid level must stabilize within 6 minutes, and the foam on the surface of the
liquid must not be greater than 2 full percent divisions. True or False? -
ANSWER: True
If less than 2.5 pints of alcohol are used, the air content is always indicated by the
final meter reading. True or False? - ANSWER: False, if the air content is more
than 9%, the number of calibrated cups of water introduced into the meter to bring
the liquid level within the graduated range must be added
If more than 2.5 pints of alcohol are used, the final meter reading is always
adjusted using . - ANSWER: A correction factor
, When large amounts of alcohol are used, the direct reading will tend to indicate a
air content. - ANSWER: Higher
At the end of the procedure, the air meter is . - ANSWER: Disassembled
and its contents examined
If portions of undisturbed concrete are found in the air meter at the end of the test,
. - ANSWER: The test is invalid
ASTM Method gives standardized requirements for , , , and
, of test specimens. - ANSWER: Making, curing, protecting, transporting
For cylinders with a diameter of 6 in. [150 mm] or greater, the tamping rod must
be a round, straight steel rod with a diameter of . - ANSWER: 5/8 +- 1/16 in
[16 mm +- 2 mm]
The minimum frequency of an internal vibrator used in this procedure is .-
ANSWER: 9000 vibrations per minute [150 Hz]
The container for obtaining the concrete sample used in this procedure can be a
, , or . - ANSWER: Metal pan, wheelbarrow, flat, clean
nonabsorbent mixing board
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. - ANSWER: 2 in. [50 mm]
The sample of concrete used in molding test specimens must be obtained in
accordance with what ASTM Standard? - ANSWER: C172
- GRADE I TEST EXAM| ALL QUESTIONS WITH
CORRECT ANSWERS| ALREADY GRADED A+
What must be done if there is an excessive amount of concrete in measure
following consolidation of the final layer? - ANSWER: Remove a representative
quantity of concrete with the scoop or trowel before the strike off
The volumetric method of determining air content of concrete can be used on
concrete containing what types of aggregate? - ANSWER: All types of aggregate
What are the requirements for the tamping rod used in the test method? -
ANSWER: Round, straight 5/8 [16 mm] +- 1/16 in. [2 mm] diameter rod at least 5
in. [300 mm] greater in length than the depth of the bowl being used, with the
tamping end rounded to a hemispherical tip of the same diameter, made of steel,
high-density polyethylene, or other plastic of equal or greater abrasion resistance.
What are the requirements for the strike-off bar used in this test method? -
ANSWER: Flat, straight steel bar at least 1/8 by 3/4 by 12 in. [3 by 20 by 300
mm] or a 4.4 flat, straight high-density polyethylene bar, or other plastic of equal
or greater abrasion resistance, at least 1/4 by 3/4 by 23 in [6 by 30 by 300 mm].
What is the approximate volume of the measuring cup used to add water to the air
meter, in relation to the volume of the air meter bowl? - ANSWER: 1.00% +-
0.04%
What type of alcohol and concentration must be used in this test method? -
ANSWER: Isopropyl, 70% by volume (65% by weight)
,A mallet weighing must be used to tap the sides of the bowl after rodding
each layer. - ANSWER: 1.25 +- 0.50 lb. (600 +- 200 g)
The sample of concrete used in this test method must be obtained in accordance
with what ASTM Standard? - ANSWER: C172
The maximum size aggregate allowed in this test method is . - ANSWER: 1
1/2 in. (37.5 mm)
If the concrete sample contains aggregate larger than that allowed for this test, the
sample must be . - ANSWER: Wet sieved over a 1-in. (25-mm) sieve
When filling the bowl of the air meter, the concrete must be placed in layers
of equal depth. - ANSWER: 2
What is the specified number of strokes required when rodding each layer of
concrete? - ANSWER: 25
It is necessary to tap the sides of the bowl after each layer has been rodded. True or
False? - ANSWER: True
The initial quantity of water and alcohol added to the air meter can be poured
directly into the neck of the top section of the air meter. True or False? -
ANSWER: False; the funnel must be used
Upon final filling of the air meter with water, what part of the liquid level should
be adjusted to the zero mark on the meter? - ANSWER: Bottom of the meniscus
,How long should the air meter be inverted and agitated? - ANSWER: No more
than five seconds at a time, but must be repeated for a minimum of 45 seconds to
free concrete from the base
How many times does the rolling operation occur? - ANSWER: A minimum of 2,
a minimum of 3
Why is the isopropyl alcohol added to the meter? - ANSWER: To dispel any foam
that may be on the surface of the water
The direct reading of the final liquid level in the neck of the air meter, is estimated
to the nearest . - ANSWER: 0.25%
If the air content is greater than the 9% range of the meter, . - ANSWER:
Calibrated cups of water are added to ring the liquid level within the graduated
range
In order for an initial meter reading to be valid, the meter must not be leaking, the
liquid level must stabilize within 6 minutes, and the foam on the surface of the
liquid must not be greater than 2 full percent divisions. True or False? -
ANSWER: True
If less than 2.5 pints of alcohol are used, the air content is always indicated by the
final meter reading. True or False? - ANSWER: False, if the air content is more
than 9%, the number of calibrated cups of water introduced into the meter to bring
the liquid level within the graduated range must be added
If more than 2.5 pints of alcohol are used, the final meter reading is always
adjusted using . - ANSWER: A correction factor
, When large amounts of alcohol are used, the direct reading will tend to indicate a
air content. - ANSWER: Higher
At the end of the procedure, the air meter is . - ANSWER: Disassembled
and its contents examined
If portions of undisturbed concrete are found in the air meter at the end of the test,
. - ANSWER: The test is invalid
ASTM Method gives standardized requirements for , , , and
, of test specimens. - ANSWER: Making, curing, protecting, transporting
For cylinders with a diameter of 6 in. [150 mm] or greater, the tamping rod must
be a round, straight steel rod with a diameter of . - ANSWER: 5/8 +- 1/16 in
[16 mm +- 2 mm]
The minimum frequency of an internal vibrator used in this procedure is .-
ANSWER: 9000 vibrations per minute [150 Hz]
The container for obtaining the concrete sample used in this procedure can be a
, , or . - ANSWER: Metal pan, wheelbarrow, flat, clean
nonabsorbent mixing board
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. - ANSWER: 2 in. [50 mm]
The sample of concrete used in molding test specimens must be obtained in
accordance with what ASTM Standard? - ANSWER: C172
