ACI Concrete Field-Testing Technician
Grade I Certification Exam (Latest Update
) Questions & Answers | Grade A |
100% Correct
ACI Concrete Field-Testing Technician Grade I
mn mn mn mn mn
PRACTICE CERTIFICATION EXAM mn mn
1. When sampling concrete from a revolving drum truck mixer, what is the correct pro
mn mn mn mn mn mn mn mn mn mn mn mn mn mn
cedure?
A) Take the sample from the first part of the discharge.
mn mn mn mn mn mn mn mn mn mn
B) Take the sample from the middle of the discharge.
mn mn mn mn mn mn mn mn mn
C) Take the sample from the last part of the discharge.
mn mn mn mn mn mn mn mn mn mn
D) Take the sample from at least two portions of the discharge taken at regular intervals thr
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
oughout the discharge. mn mn
2. What is the maximum allowable time permitted between obtaining the first and fin
mn mn mn mn mn mn mn mn mn mn mn mn mn
al portions of a composite sample of concrete?
mn mn mn mn mn mn mn
A) 5 minutes
mn mn
B) 10 minutes
mn mn
C) 15 minutes
mn mn
D) 20 minutes
mn mn
3. According to ASTM C143, what is the required procedure if the concrete in the slu
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
mp test slumps on one side (shear slump)?
mn mn mn mn mn mn mn
A) Discard the test and retest using a new sample.
mn mn mn mn mn mn mn mn mn
B) Record the average of the lowest and highest point.
mn mn mn mn mn mn mn mn mn
C) Record the measurement as the slump and note the shear in the remarks.
mn mn mn mn mn mn mn mn mn mn mn mn mn
D) Record the result as zero slump.
mn mn mn mn mn mn
4. When performing the slump test (ASTM C143), the rod must be of what shape and
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
diameter?
A) Rectangular, ½ inch
mn mn mn
B) Round, ⅝ inch
mn mn mn
C) Round, ½ inch
mn mn mn
D) Rectangular, ⅝ inch
mn mn mn
5. What is the required number of strokes of the tamping rod for each layer when filli
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
ng the slump cone?
mn mn mn
,A) 15 strokes per layer
mn mn mn mn
B) 20 strokes per layer
mn mn mn mn
C) 25 strokes per layer
mn mn mn mn
D) 30 strokes per layer
mn mn mn mn
6. For the slump test, the slump cone must be filled in how many layers, and what is t
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
he approximate volume of each layer?
mn mn mn mn mn
A) 2 layers; one-half the volume
mn mn mn mn mn
B) 3 layers; one-third the volume
mn mn mn mn mn
C) 4 layers; one-quarter the volume
mn mn mn mn mn
D) 3 layers; equal volume
mn mn mn mn
7. The temperature of freshly mixed concrete (ASTM C1064) must be reported to the
mn mn mn mn mn mn mn mn mn mn mn mn mn mn
nearest:
A) 0.1°F (0.5°C)
mn mn
B) 1°F (0.5°C)
mn mn
C) 0.5°F (0.2°C)
mn mn
D) 0.5°F (0.5°C)
mn mn
8. When measuring the temperature of concrete, the thermometer must have a minim
mn mn mn mn mn mn mn mn mn mn mn mn
um accuracy of:
mn mn
A) ±0.5°F (±0.3°C)
mn mn
B) ±1.0°F (±0.5°C)
mn mn
C) ±2.0°F (±1.0°C)
mn mn
D) ±0.1°F (±0.1°C)
mn mn
9. Which of the following is NOT an acceptable method for molding 6 x 12-
mn mn mn mn mn mn mn mn mn mn mn mn mn mn
inch concrete cylinders according to ASTM C31/C31M?
mn mn mn mn mn mn
A) Rodding
mn
B) Vibrating
mn
C) Tamping with a wooden mallet
mn mn mn mn mn
D) Internal vibration
mn mn
10. When rodding a 6 x 12-
mn mn mn mn mn mn
inch concrete cylinder, how many strokes of the tamping rod are required per layer?
mn mn mn mn mn mn mn mn mn mn mn mn mn
A) 15 strokes
mn mn
B) 25 strokes
mn mn
C) 30 strokes
mn mn
D) 50 strokes
mn mn
11. For a 6 x 12-
mn mn mn mn mn
inch cylinder molded in three layers, after rodding each layer, what must be done?
mn mn mn mn mn mn mn mn mn mn mn mn mn
A) Tap the outside of the mold with the tamping rod 10-15 times.
mn mn mn mn mn mn mn mn mn mn mn mn
B) Tap the outside of the mold with a rubber mallet 10-15 times.
mn mn mn mn mn mn mn mn mn mn mn mn
,C) Strike the outside of the mold with a wooden mallet 10-15 times.
mn mn mn mn mn mn mn mn mn mn mn mn
D) Do nothing; just proceed to the next layer.
mn mn mn mn mn mn mn mn
12. After the final layer of concrete has been rodded in a 6 x 12-
mn mn mn mn mn mn mn mn mn mn mn mn mn mn
inch cylinder, what is the correct finishing procedure?
mn mn mn mn mn mn mn
A) Strike off the top with the tamping rod.
mn mn mn mn mn mn mn mn
B) Strike off the top with a float.
mn mn mn mn mn mn mn
C) Strike off the top with a trowel.
mn mn mn mn mn mn mn
D) Strike off the top with the tamping rod and then cap with a flat plate.
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
13. Cylinders for compressive strength testing should be stored in a moist-
mn mn mn mn mn mn mn mn mn mn mn
curing environment at what temperature range, according to ASTM C31?
mn mn mn mn mn mn mn mn mn
A) 60°F to 80°F (16°C to 27°C)
mn mn mn mn mn mn
B) 65°F to 75°F (18°C to 24°C)
mn mn mn mn mn mn
C) 73°F ± 3°F (23°C ± 2°C)
mn mn mn mn mn mn
D) 70°F ± 5°F (21°C ± 3°C)
mn mn mn mn mn mn
14. What is the primary reason for using a strike-off plate when finishing a cylinder?
mn mn mn mn mn mn mn mn mn mn mn mn mn mn
A) To create a smooth surface for handling.
mn mn mn mn mn mn mn
B) To reduce the amount of bleeding.
mn mn mn mn mn mn
C) To ensure the top surface is level and plane with the rim of the mold.
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
D) To remove excess water from the top of the sample.
mn mn mn mn mn mn mn mn mn mn
15. The Air Content of concrete by the Pressure Method (ASTM C231) is based on Boy
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
le's Law. This means:
mn mn mn
A) The volume of air is inversely proportional to the pressure.
mn mn mn mn mn mn mn mn mn mn
B) The volume of air is directly proportional to the pressure.
mn mn mn mn mn mn mn mn mn mn
C) The temperature of the air remains constant.
mn mn mn mn mn mn mn
D) Both A and C.
mn mn mn mn
16. In the pressure method for air content (ASTM C231), the initial pressure applied to
mn mn mn mn mn mn mn mn mn mn mn mn mn mn
the concrete is:
mn mn mn
A) 15 psi (103 kPa)
mn mn mn mn
B) 30 psi (207 kPa)
mn mn mn mn
C) Dependent on the type of meter being used.
mn mn mn mn mn mn mn mn
D) Determined by the initial water level.
mn mn mn mn mn mn
17. In the Unit Weight (Density) test (ASTM C138), the concrete is placed into the mea
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
sure in how many layers, and how many strokes of the rod are required for each layer
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
?
A) 3 layers; 25 strokes
mn mn mn mn
B) 3 layers; 30 strokes
mn mn mn mn
C) 2 layers; 25 strokes
mn mn mn mn
D) 2 layers; 30 strokes
mn mn mn mn
, 18. If the concrete contains aggregate larger than 1½ inches (37.5 mm), what must be
mn mn mn mn mn mn mn mn mn mn mn mn mn mn
done before performing the unit weight test?
mn mn mn mn mn mn mn
A) Use a larger measure.
mn mn mn mn
B) Wet-sieve the concrete over a 1½-inch sieve.
mn mn mn mn mn mn mn
C) Use a different method.
mn mn mn mn
D) No adjustments are needed.
mn mn mn mn
19. The bulk density (unit weight) of concrete is calculated using the mass of the conc
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
rete and the: mn mn
A) Volume of the measure.
mn mn mn mn
B) Specific gravity of the aggregate.
mn mn mn mn mn
C) Water-cement ratio.
mn mn
D) Slump. mn
20. When performing the Slump Test, the tamping rod should be kept in contact with
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
the base plate. What is the purpose of this?
mn mn mn mn mn mn mn mn
A) To prevent the rod from getting dirty.
mn mn mn mn mn mn mn
B) To ensure that the rod is clean.
mn mn mn mn mn mn mn
C) To ensure the rod is vertical and to maintain a consistent drop height.
mn mn mn mn mn mn mn mn mn mn mn mn mn
D) To prevent the concrete from sticking to the rod.
mn mn mn mn mn mn mn mn mn
21. According to ASTM C172, what is the minimum size of the sample of concrete req
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
uired for making standard test specimens?
mn mn mn mn mn
A) 0.5 ft³ (14 L)
mn mn mn mn
B) 1.0 ft³ (28 L)
mn mn mn mn
C) 1.5 ft³ (42 L)
mn mn mn mn
D) 2.0 ft³ (56 L)
mn mn mn mn
22. What is the maximum time allowed between obtaining the sample and starting th
mn mn mn mn mn mn mn mn mn mn mn mn mn
e tests for slump and temperature?
mn mn mn mn mn
A) 5 minutes
mn mn
B) 10 minutes
mn mn
C) 15 minutes
mn mn
D) 25 minutes
mn mn
23. When using the pressure meter to determine air content, the operator must ensure
mn mn mn mn mn mn mn mn mn mn mn mn mn
the concrete is compacted properly. If the meter is over-
mn mn mn mn mn mn mn mn mn mn
vibrated, what is likely to happen? mn mn mn mn mn
A) The air content will read artificially high.
mn mn mn mn mn mn mn
B) The air content will read artificially low.
mn mn mn mn mn mn mn
C) The meter will not seal properly.
mn mn mn mn mn mn
D) The concrete will segregate.
mn mn mn mn
Grade I Certification Exam (Latest Update
) Questions & Answers | Grade A |
100% Correct
ACI Concrete Field-Testing Technician Grade I
mn mn mn mn mn
PRACTICE CERTIFICATION EXAM mn mn
1. When sampling concrete from a revolving drum truck mixer, what is the correct pro
mn mn mn mn mn mn mn mn mn mn mn mn mn mn
cedure?
A) Take the sample from the first part of the discharge.
mn mn mn mn mn mn mn mn mn mn
B) Take the sample from the middle of the discharge.
mn mn mn mn mn mn mn mn mn
C) Take the sample from the last part of the discharge.
mn mn mn mn mn mn mn mn mn mn
D) Take the sample from at least two portions of the discharge taken at regular intervals thr
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
oughout the discharge. mn mn
2. What is the maximum allowable time permitted between obtaining the first and fin
mn mn mn mn mn mn mn mn mn mn mn mn mn
al portions of a composite sample of concrete?
mn mn mn mn mn mn mn
A) 5 minutes
mn mn
B) 10 minutes
mn mn
C) 15 minutes
mn mn
D) 20 minutes
mn mn
3. According to ASTM C143, what is the required procedure if the concrete in the slu
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
mp test slumps on one side (shear slump)?
mn mn mn mn mn mn mn
A) Discard the test and retest using a new sample.
mn mn mn mn mn mn mn mn mn
B) Record the average of the lowest and highest point.
mn mn mn mn mn mn mn mn mn
C) Record the measurement as the slump and note the shear in the remarks.
mn mn mn mn mn mn mn mn mn mn mn mn mn
D) Record the result as zero slump.
mn mn mn mn mn mn
4. When performing the slump test (ASTM C143), the rod must be of what shape and
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
diameter?
A) Rectangular, ½ inch
mn mn mn
B) Round, ⅝ inch
mn mn mn
C) Round, ½ inch
mn mn mn
D) Rectangular, ⅝ inch
mn mn mn
5. What is the required number of strokes of the tamping rod for each layer when filli
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
ng the slump cone?
mn mn mn
,A) 15 strokes per layer
mn mn mn mn
B) 20 strokes per layer
mn mn mn mn
C) 25 strokes per layer
mn mn mn mn
D) 30 strokes per layer
mn mn mn mn
6. For the slump test, the slump cone must be filled in how many layers, and what is t
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
he approximate volume of each layer?
mn mn mn mn mn
A) 2 layers; one-half the volume
mn mn mn mn mn
B) 3 layers; one-third the volume
mn mn mn mn mn
C) 4 layers; one-quarter the volume
mn mn mn mn mn
D) 3 layers; equal volume
mn mn mn mn
7. The temperature of freshly mixed concrete (ASTM C1064) must be reported to the
mn mn mn mn mn mn mn mn mn mn mn mn mn mn
nearest:
A) 0.1°F (0.5°C)
mn mn
B) 1°F (0.5°C)
mn mn
C) 0.5°F (0.2°C)
mn mn
D) 0.5°F (0.5°C)
mn mn
8. When measuring the temperature of concrete, the thermometer must have a minim
mn mn mn mn mn mn mn mn mn mn mn mn
um accuracy of:
mn mn
A) ±0.5°F (±0.3°C)
mn mn
B) ±1.0°F (±0.5°C)
mn mn
C) ±2.0°F (±1.0°C)
mn mn
D) ±0.1°F (±0.1°C)
mn mn
9. Which of the following is NOT an acceptable method for molding 6 x 12-
mn mn mn mn mn mn mn mn mn mn mn mn mn mn
inch concrete cylinders according to ASTM C31/C31M?
mn mn mn mn mn mn
A) Rodding
mn
B) Vibrating
mn
C) Tamping with a wooden mallet
mn mn mn mn mn
D) Internal vibration
mn mn
10. When rodding a 6 x 12-
mn mn mn mn mn mn
inch concrete cylinder, how many strokes of the tamping rod are required per layer?
mn mn mn mn mn mn mn mn mn mn mn mn mn
A) 15 strokes
mn mn
B) 25 strokes
mn mn
C) 30 strokes
mn mn
D) 50 strokes
mn mn
11. For a 6 x 12-
mn mn mn mn mn
inch cylinder molded in three layers, after rodding each layer, what must be done?
mn mn mn mn mn mn mn mn mn mn mn mn mn
A) Tap the outside of the mold with the tamping rod 10-15 times.
mn mn mn mn mn mn mn mn mn mn mn mn
B) Tap the outside of the mold with a rubber mallet 10-15 times.
mn mn mn mn mn mn mn mn mn mn mn mn
,C) Strike the outside of the mold with a wooden mallet 10-15 times.
mn mn mn mn mn mn mn mn mn mn mn mn
D) Do nothing; just proceed to the next layer.
mn mn mn mn mn mn mn mn
12. After the final layer of concrete has been rodded in a 6 x 12-
mn mn mn mn mn mn mn mn mn mn mn mn mn mn
inch cylinder, what is the correct finishing procedure?
mn mn mn mn mn mn mn
A) Strike off the top with the tamping rod.
mn mn mn mn mn mn mn mn
B) Strike off the top with a float.
mn mn mn mn mn mn mn
C) Strike off the top with a trowel.
mn mn mn mn mn mn mn
D) Strike off the top with the tamping rod and then cap with a flat plate.
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
13. Cylinders for compressive strength testing should be stored in a moist-
mn mn mn mn mn mn mn mn mn mn mn
curing environment at what temperature range, according to ASTM C31?
mn mn mn mn mn mn mn mn mn
A) 60°F to 80°F (16°C to 27°C)
mn mn mn mn mn mn
B) 65°F to 75°F (18°C to 24°C)
mn mn mn mn mn mn
C) 73°F ± 3°F (23°C ± 2°C)
mn mn mn mn mn mn
D) 70°F ± 5°F (21°C ± 3°C)
mn mn mn mn mn mn
14. What is the primary reason for using a strike-off plate when finishing a cylinder?
mn mn mn mn mn mn mn mn mn mn mn mn mn mn
A) To create a smooth surface for handling.
mn mn mn mn mn mn mn
B) To reduce the amount of bleeding.
mn mn mn mn mn mn
C) To ensure the top surface is level and plane with the rim of the mold.
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
D) To remove excess water from the top of the sample.
mn mn mn mn mn mn mn mn mn mn
15. The Air Content of concrete by the Pressure Method (ASTM C231) is based on Boy
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
le's Law. This means:
mn mn mn
A) The volume of air is inversely proportional to the pressure.
mn mn mn mn mn mn mn mn mn mn
B) The volume of air is directly proportional to the pressure.
mn mn mn mn mn mn mn mn mn mn
C) The temperature of the air remains constant.
mn mn mn mn mn mn mn
D) Both A and C.
mn mn mn mn
16. In the pressure method for air content (ASTM C231), the initial pressure applied to
mn mn mn mn mn mn mn mn mn mn mn mn mn mn
the concrete is:
mn mn mn
A) 15 psi (103 kPa)
mn mn mn mn
B) 30 psi (207 kPa)
mn mn mn mn
C) Dependent on the type of meter being used.
mn mn mn mn mn mn mn mn
D) Determined by the initial water level.
mn mn mn mn mn mn
17. In the Unit Weight (Density) test (ASTM C138), the concrete is placed into the mea
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
sure in how many layers, and how many strokes of the rod are required for each layer
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
?
A) 3 layers; 25 strokes
mn mn mn mn
B) 3 layers; 30 strokes
mn mn mn mn
C) 2 layers; 25 strokes
mn mn mn mn
D) 2 layers; 30 strokes
mn mn mn mn
, 18. If the concrete contains aggregate larger than 1½ inches (37.5 mm), what must be
mn mn mn mn mn mn mn mn mn mn mn mn mn mn
done before performing the unit weight test?
mn mn mn mn mn mn mn
A) Use a larger measure.
mn mn mn mn
B) Wet-sieve the concrete over a 1½-inch sieve.
mn mn mn mn mn mn mn
C) Use a different method.
mn mn mn mn
D) No adjustments are needed.
mn mn mn mn
19. The bulk density (unit weight) of concrete is calculated using the mass of the conc
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
rete and the: mn mn
A) Volume of the measure.
mn mn mn mn
B) Specific gravity of the aggregate.
mn mn mn mn mn
C) Water-cement ratio.
mn mn
D) Slump. mn
20. When performing the Slump Test, the tamping rod should be kept in contact with
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
the base plate. What is the purpose of this?
mn mn mn mn mn mn mn mn
A) To prevent the rod from getting dirty.
mn mn mn mn mn mn mn
B) To ensure that the rod is clean.
mn mn mn mn mn mn mn
C) To ensure the rod is vertical and to maintain a consistent drop height.
mn mn mn mn mn mn mn mn mn mn mn mn mn
D) To prevent the concrete from sticking to the rod.
mn mn mn mn mn mn mn mn mn
21. According to ASTM C172, what is the minimum size of the sample of concrete req
mn mn mn mn mn mn mn mn mn mn mn mn mn mn mn
uired for making standard test specimens?
mn mn mn mn mn
A) 0.5 ft³ (14 L)
mn mn mn mn
B) 1.0 ft³ (28 L)
mn mn mn mn
C) 1.5 ft³ (42 L)
mn mn mn mn
D) 2.0 ft³ (56 L)
mn mn mn mn
22. What is the maximum time allowed between obtaining the sample and starting th
mn mn mn mn mn mn mn mn mn mn mn mn mn
e tests for slump and temperature?
mn mn mn mn mn
A) 5 minutes
mn mn
B) 10 minutes
mn mn
C) 15 minutes
mn mn
D) 25 minutes
mn mn
23. When using the pressure meter to determine air content, the operator must ensure
mn mn mn mn mn mn mn mn mn mn mn mn mn
the concrete is compacted properly. If the meter is over-
mn mn mn mn mn mn mn mn mn mn
vibrated, what is likely to happen? mn mn mn mn mn
A) The air content will read artificially high.
mn mn mn mn mn mn mn
B) The air content will read artificially low.
mn mn mn mn mn mn mn
C) The meter will not seal properly.
mn mn mn mn mn mn
D) The concrete will segregate.
mn mn mn mn
