ACI Certification- Concrete Field Testing Technician Grade 1
CP-1 (12) Exam 2025–2026 Accurate Real Exam Questions
and Verified Correct Answers JUST RELEASED
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? - answer>>>5 ± 2 seconds
The measurement for slump is made from the top of the mold to what point of the
concrete specimen? - answer>>>The displaced original center of 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? -
answer>>>2½ minutes
ASTM C138 - answer>>>Standard Test Method for Density (Unit Weight),
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? -
answer>>>7000 vibrations per minute
,The outside diameter or side dimension of the vibrating element must be at least _____
but not greater than _____ . - answer>>>0.75 in. [19 mm], 1.50 in. [38 mm]
A plastic container can be used for the measure in this method. True or False? -
answer>>>False, measure must be steel or other suitable metal
What is the minimum thickness of a metal strike-off plate? - answer>>>¼ 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 _____. -
answer>>>C29
Air meter bowls used for this test must conform to ASTM _____ and be calibrated for
volume according
to ASTM _____. - answer>>>C231, C29
The concrete sample must be obtained in accordance with what ASTM method? -
answer>>>C172
What method of consolidation must be used when the slump is greater than 3 in. [75
mm]? - answer>>>Rodding
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
If, after consolidation of the final layer, the concrete level is 1/2 in. (13 mm) above the top
of the measure, what should be done? - answer>>>Remove a representative portion of
the excess concrete with a trowel or scoop
After consolidation of the final layer, an excess of concrete _____ above the top of the
measure is considered optimum. - answer>>>⅛ in. [3 mm]
After completing the strike-off procedure, what must be done before weighing the
measure and sample? - answer>>>Clean off any excess concrete
Density (Unit Weight) Calculation
Known: Volume of measure = 0.504 ft3 [14.27 L or 0.01427 m3]
Mass of empty measure = 19.6 lb [8.89 kg]
The procedures of Method C138 are followed, and the mass of the measure plus the
concrete is found to be 92.1 lb [41.78 kg]. Calculate the density of the concrete in lb/ft3
[kg/m3]. - answer>>>143.9 lb/ft3 [2305 kg/m3]
Yield Calculations
For a design batch of 7.0 yd3 [5.4 m3], the total mass of all materials batched was 27,300
lb [12,383 kg]. Using the density of the concrete as determined in Question 21, calculate:
a) The yield per batch in ft3
b) The yield per batch in yd3
c) The yield in m3
d) The yield per cubic yard in ft3/yd3 - answer>>>a. Yield per batch = 189.7 ft3
CP-1 (12) Exam 2025–2026 Accurate Real Exam Questions
and Verified Correct Answers JUST RELEASED
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? - answer>>>5 ± 2 seconds
The measurement for slump is made from the top of the mold to what point of the
concrete specimen? - answer>>>The displaced original center of 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? -
answer>>>2½ minutes
ASTM C138 - answer>>>Standard Test Method for Density (Unit Weight),
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? -
answer>>>7000 vibrations per minute
,The outside diameter or side dimension of the vibrating element must be at least _____
but not greater than _____ . - answer>>>0.75 in. [19 mm], 1.50 in. [38 mm]
A plastic container can be used for the measure in this method. True or False? -
answer>>>False, measure must be steel or other suitable metal
What is the minimum thickness of a metal strike-off plate? - answer>>>¼ 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 _____. -
answer>>>C29
Air meter bowls used for this test must conform to ASTM _____ and be calibrated for
volume according
to ASTM _____. - answer>>>C231, C29
The concrete sample must be obtained in accordance with what ASTM method? -
answer>>>C172
What method of consolidation must be used when the slump is greater than 3 in. [75
mm]? - answer>>>Rodding
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
If, after consolidation of the final layer, the concrete level is 1/2 in. (13 mm) above the top
of the measure, what should be done? - answer>>>Remove a representative portion of
the excess concrete with a trowel or scoop
After consolidation of the final layer, an excess of concrete _____ above the top of the
measure is considered optimum. - answer>>>⅛ in. [3 mm]
After completing the strike-off procedure, what must be done before weighing the
measure and sample? - answer>>>Clean off any excess concrete
Density (Unit Weight) Calculation
Known: Volume of measure = 0.504 ft3 [14.27 L or 0.01427 m3]
Mass of empty measure = 19.6 lb [8.89 kg]
The procedures of Method C138 are followed, and the mass of the measure plus the
concrete is found to be 92.1 lb [41.78 kg]. Calculate the density of the concrete in lb/ft3
[kg/m3]. - answer>>>143.9 lb/ft3 [2305 kg/m3]
Yield Calculations
For a design batch of 7.0 yd3 [5.4 m3], the total mass of all materials batched was 27,300
lb [12,383 kg]. Using the density of the concrete as determined in Question 21, calculate:
a) The yield per batch in ft3
b) The yield per batch in yd3
c) The yield in m3
d) The yield per cubic yard in ft3/yd3 - answer>>>a. Yield per batch = 189.7 ft3
