ACI Certification- Concrete Field Testing
Technician Grade 1 CP-1 (12) /159
Questions And Answers 2025
After the final rodding, the sides of the slump mold should be tapped lightly
with the tamping rod. True or False? - ANSWER
>>False
When raising the slump mold, it should not be rotated or twisted. True or
False? -
ANSWER>>True
How much time is allowed for lifting the slump mold? - >>5 ±
ANSWER2
seconds
The measurement for slump is made from the top of the mold to what point
of the concrete specimen? - >>The displaced original center of
ANSWER
the top surface of the specimen
The slump of the concrete is measured and reported to the nearest _____.
- ANSWER>>¼ in. [5 mm]
How much time is allowed to conduct the slump test from beginning to
completion? - >>2½ minutes
ANSWER
ASTM C138 - >>Standard Test Method for Density (Unit Weight),
ANSWER
,Yield, and Air Content (Gravimetric) of Concrete
The diameter of the tamping rod used in this test method is _____ . -
ANSWER >>⅝ in. [16
mm]
What is the required shape of the tamping end of the rod? -
ANSWER >>Rounded to a hemispherical
tip
What is the required minimum frequency of the vibrator used in this test
method? - >>7000 vibrations per minute
ANSWER
The outside diameter or side dimension of the vibrating element must be at
least _____ but not greater than _____ . - >>0.75 in. [19
ANSWERmm],
1.50 in. [38 mm]
A plastic container can be used for the measure in this method. True or
False? - >>False, measure must be steel or other suitable metal
ANSWER
What is the minimum thickness of a metal strike-off plate? - >>¼
ANSWER
in. [6 mm]
What is the minimum thickness for a glass or acrylic strike-off plate? -
ANSWER >>½ in. [12
mm]
What is the specified weight of the mallet used on measures that are 0.5 ft3
[14 L] or smaller? - ANSWER >>1.25 ± 0.50 lb. [600 ± 200 g]
Measures other than air meter bowls used for this test must conform to
, ASTM _____. - >>C29
ANSWER
Air meter bowls used for this test must conform to ASTM _____ and be
calibrated for volume according
to ASTM _____. - >>C231,
ANSWERC29
The concrete sample must be obtained in accordance with what ASTM
method? - >>C172
ANSWER
What method of consolidation must be used when the slump is greater than
3 in. [75 mm]? - >>Rodding
ANSWER
What method of consolidation must be used when the slump is less than 1
in. [25 mm]? - ANSWER
>>Vibration
If rodding is the method of consolidation being used, the measure must be
filled in how many layers? -
ANSWER>>3
For a measure of 0.5 ft3 [14 L], what is the required number of strokes of
the tamping rod for consolidation of each layer? - ANSWER>>25
When rodding the middle and the top layers, the tamping rod should
penetrate into the layer below approximately _____. - ANSWER>>1 in. [25
mm]
If vibration is the method of consolidation, the measure must be filled in
_____ approximately equal layers. - ANSWER
>>2
Technician Grade 1 CP-1 (12) /159
Questions And Answers 2025
After the final rodding, the sides of the slump mold should be tapped lightly
with the tamping rod. True or False? - ANSWER
>>False
When raising the slump mold, it should not be rotated or twisted. True or
False? -
ANSWER>>True
How much time is allowed for lifting the slump mold? - >>5 ±
ANSWER2
seconds
The measurement for slump is made from the top of the mold to what point
of the concrete specimen? - >>The displaced original center of
ANSWER
the top surface of the specimen
The slump of the concrete is measured and reported to the nearest _____.
- ANSWER>>¼ in. [5 mm]
How much time is allowed to conduct the slump test from beginning to
completion? - >>2½ minutes
ANSWER
ASTM C138 - >>Standard Test Method for Density (Unit Weight),
ANSWER
,Yield, and Air Content (Gravimetric) of Concrete
The diameter of the tamping rod used in this test method is _____ . -
ANSWER >>⅝ in. [16
mm]
What is the required shape of the tamping end of the rod? -
ANSWER >>Rounded to a hemispherical
tip
What is the required minimum frequency of the vibrator used in this test
method? - >>7000 vibrations per minute
ANSWER
The outside diameter or side dimension of the vibrating element must be at
least _____ but not greater than _____ . - >>0.75 in. [19
ANSWERmm],
1.50 in. [38 mm]
A plastic container can be used for the measure in this method. True or
False? - >>False, measure must be steel or other suitable metal
ANSWER
What is the minimum thickness of a metal strike-off plate? - >>¼
ANSWER
in. [6 mm]
What is the minimum thickness for a glass or acrylic strike-off plate? -
ANSWER >>½ in. [12
mm]
What is the specified weight of the mallet used on measures that are 0.5 ft3
[14 L] or smaller? - ANSWER >>1.25 ± 0.50 lb. [600 ± 200 g]
Measures other than air meter bowls used for this test must conform to
, ASTM _____. - >>C29
ANSWER
Air meter bowls used for this test must conform to ASTM _____ and be
calibrated for volume according
to ASTM _____. - >>C231,
ANSWERC29
The concrete sample must be obtained in accordance with what ASTM
method? - >>C172
ANSWER
What method of consolidation must be used when the slump is greater than
3 in. [75 mm]? - >>Rodding
ANSWER
What method of consolidation must be used when the slump is less than 1
in. [25 mm]? - ANSWER
>>Vibration
If rodding is the method of consolidation being used, the measure must be
filled in how many layers? -
ANSWER>>3
For a measure of 0.5 ft3 [14 L], what is the required number of strokes of
the tamping rod for consolidation of each layer? - ANSWER>>25
When rodding the middle and the top layers, the tamping rod should
penetrate into the layer below approximately _____. - ANSWER>>1 in. [25
mm]
If vibration is the method of consolidation, the measure must be filled in
_____ approximately equal layers. - ANSWER
>>2
