ACI Certification- Concrete Field-Testing
Technician Exam Grade 1 CP-1 (12) /159 Verified
Correct Answers
A plastic container can be used for the measure in this method. True or
False? - CORRECT ANSWER>>False, measure must be steel or other suitable metal
What is the minimum thickness of a metal strike-off plate? - CORRECT ANSWER>>¼ in.
[6 mm]
What is the minimum thickness for a glass or acrylic strike-off plate? -
CORRECT 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? - CORRECT ANSWER>>1.25 ± 0.50 lb. [600 ± 200 g]
Measures other than air meter bowls used for this test must conform to
ASTM _____. - CORRECT ANSWER>>C29
Air meter bowls used for this test must conform to ASTM _____ and be
calibrated for volume according to ASTM _____. - CORRECT
ANSWER>>C231, C29
,The concrete sample must be obtained in accordance with what ASTM
method? - CORRECT ANSWER>>C172
What method of consolidation must be used when the slump is greater than
3 in. [75 mm]? - CORRECT ANSWER>>Rodding
What method of consolidation must be used when the slump is less than 1
in. [25 mm]? - CORRECT ANSWER>>Vibration
If rodding is the method of consolidation being used, the measure must be
filled in how many layers? - CORRECT 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? - CORRECT
ANSWER>>25
When rodding the middle and the top layers, the tamping rod should penetrate into
the layer below approximately _____. - CORRECT ANSWER>>1 in. [25 mm]
If vibration is the method of consolidation, the measure must be filled in
_____ approximately equal layers. - CORRECT 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? -
, CORRECT 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. - CORRECT ANSWER>>⅛ in. [3 mm]
After completing the strike-off procedure, what must be done before weighing
the measure and sample? - CORRECT 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]. - CORRECT 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 - CORRECT ANSWER>>a. Yield per
batch =
189.7 ft3
Technician Exam Grade 1 CP-1 (12) /159 Verified
Correct Answers
A plastic container can be used for the measure in this method. True or
False? - CORRECT ANSWER>>False, measure must be steel or other suitable metal
What is the minimum thickness of a metal strike-off plate? - CORRECT ANSWER>>¼ in.
[6 mm]
What is the minimum thickness for a glass or acrylic strike-off plate? -
CORRECT 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? - CORRECT ANSWER>>1.25 ± 0.50 lb. [600 ± 200 g]
Measures other than air meter bowls used for this test must conform to
ASTM _____. - CORRECT ANSWER>>C29
Air meter bowls used for this test must conform to ASTM _____ and be
calibrated for volume according to ASTM _____. - CORRECT
ANSWER>>C231, C29
,The concrete sample must be obtained in accordance with what ASTM
method? - CORRECT ANSWER>>C172
What method of consolidation must be used when the slump is greater than
3 in. [75 mm]? - CORRECT ANSWER>>Rodding
What method of consolidation must be used when the slump is less than 1
in. [25 mm]? - CORRECT ANSWER>>Vibration
If rodding is the method of consolidation being used, the measure must be
filled in how many layers? - CORRECT 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? - CORRECT
ANSWER>>25
When rodding the middle and the top layers, the tamping rod should penetrate into
the layer below approximately _____. - CORRECT ANSWER>>1 in. [25 mm]
If vibration is the method of consolidation, the measure must be filled in
_____ approximately equal layers. - CORRECT 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? -
, CORRECT 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. - CORRECT ANSWER>>⅛ in. [3 mm]
After completing the strike-off procedure, what must be done before weighing
the measure and sample? - CORRECT 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]. - CORRECT 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 - CORRECT ANSWER>>a. Yield per
batch =
189.7 ft3
