ACI Concrete Field Testing Technician Grade I (CP-1)
Practice Exam 150 Practice Questions with Solutions and
Detailed Rationales LATEST UPDATED THIS YEAR
INSTANT PDF DOWNLOAD
This comprehensive practice exam is structured around the seven core ASTM standards
tested on the ACI Concrete Field Testing Technician Grade I certification:
1. ASTM C1064/C1064M – Temperature of Freshly Mixed Hydraulic-Cement Concrete
2. ASTM C172/C172M – Sampling Freshly Mixed Concrete
3. ASTM C143/C143M – Slump of Hydraulic-Cement Concrete
4. ASTM C138/C138M – Density (Unit Weight), Yield, and Air Content (Gravimetric) of
Concrete
5. ASTM C231/C231M – Air Content of Freshly Mixed Concrete by the Pressure
Method
6. ASTM C173/C173M – Air Content of Freshly Mixed Concrete by the Volumetric
Method
7. ASTM C31/C31M – Making and Curing Concrete Test Specimens in the Field
Part 1: ASTM C1064 – Temperature of Freshly Mixed Concrete
1. What is the minimum depth of concrete cover required in all directions around the
temperature-measuring sensor?
A) 1 in. [25 mm]
, B) 2 in. [50 mm]
C) 3 in. [75 mm]
D) 4 in. [100 mm]
ASTM C1064 requires a minimum of 3 inches [75 mm] of concrete surrounding the
sensor in all directions to ensure ambient air temperature does not influence the
reading.
2. How long must the temperature-measuring device remain in the freshly mixed
concrete before reading?
A) At least 1 minute
B) A minimum of 2 minutes, or until the reading stabilizes
C) Exactly 5 minutes
D) 30 seconds
The sensor must remain submerged for a minimum of 2 minutes, or until the
temperature reading stabilizes to within 0.5°F [0.3°C] of its final value.
3. What is the required accuracy for the temperature-measuring device used in ASTM
C1064?
A) ± 0.5°F [± 0.3°C]
B) ± 1.0°F [± 0.5°C]
C) ± 1.5°F [± 0.8°C]
D) ± 2.0°F [± 1.0°C]
The temperature measuring device must be accurate to within ± 1.0°F [± 0.5°C]
across its verified operating range.
4. How often must the reference temperature-measuring device (liquid-in-glass) be
calibrated?
A) Every 6 months
B) Every 12 months (annually)
C) Every 2 years
D) Before every pour
, Calibration of the reference device is required at least once every 12 months or
whenever its accuracy is in question.
5. When taking the temperature of concrete with a maximum nominal aggregate size
of 2 inches, which of the following is correct?
A) The concrete must be wet-screened over a 1.5-inch sieve.
B) The temperature measurement must be performed inside the concrete mixer.
C) The temperature can be measured in the transport or placement container
directly, provided there is enough cover.
D) The temperature can only be measured inside a standard cylinder mold.
The test can be conducted in-place or in transport containers as long as the 3-inch
[75 mm] minimum concrete cover is maintained around the sensor.
6. True or False: It is acceptable to measure the temperature of concrete that has
been placed on a dry, subgrade surface.
A) True
B) False
The temperature must be measured before placement to prevent the subgrade
temperature or moisture loss from skewing the results.
7. If the concrete contains aggregate larger than 3 inches [75 mm], what must be
done before measuring the temperature?
A) It may require up to 20 minutes for the temperature of the concrete to
stabilize after mixing.
B) The concrete must be heated with a blowtorch.
C) The test is entirely invalid and must be skipped.
D) Cold water must be added to the mix.
For concretes containing nominal maximum aggregate sizes larger than 3 inches [75
mm], temperature stabilization may take up to 20 minutes.
8. What is the verified temperature range required for the measuring device?
A) 0 to 100°F [-18 to 38°C]
, B) 30 to 120°F [0 to 50°C]
C) 50 to 150°F [10 to 65°C]
D) 32 to 212°F [0 to 100°C]
ASTM C1064 specifies that the device must be capable of measuring fresh concrete
temperatures between 30°F and 120°F [0°C to 50°C].
9. True or False: The temperature-measuring device should be held upright and never
allowed to touch the sides or bottom of the container.
A) True
B) False
The sensor must not contact the container walls or steel reinforcements, as this can
transfer external thermal energy to the sensor.
10. After inserting the temperature sensor into the concrete, what action should the
technician perform to seal the entry point?
A) Pour water over the insertion point.
B) Gently press the concrete around the measuring device to block outside air.
C) Leave a small void around the shaft to vent air.
D) Tap the container 15 times with a mallet.
Pressing the concrete around the device's stem ensures that outside ambient air
does not flow down into the concrete and affect the sensor reading.
Part 2: ASTM C172 – Sampling Freshly Mixed Concrete
11. What is the maximum allowed elapsed time between obtaining the first and final
portions of a composite concrete sample?
A) 5 minutes
B) 15 minutes
C) 20 minutes
D) 30 minutes
ASTM C172 requires that the composite sample be fully collected within a maximum
elapsed time of 15 minutes.
Practice Exam 150 Practice Questions with Solutions and
Detailed Rationales LATEST UPDATED THIS YEAR
INSTANT PDF DOWNLOAD
This comprehensive practice exam is structured around the seven core ASTM standards
tested on the ACI Concrete Field Testing Technician Grade I certification:
1. ASTM C1064/C1064M – Temperature of Freshly Mixed Hydraulic-Cement Concrete
2. ASTM C172/C172M – Sampling Freshly Mixed Concrete
3. ASTM C143/C143M – Slump of Hydraulic-Cement Concrete
4. ASTM C138/C138M – Density (Unit Weight), Yield, and Air Content (Gravimetric) of
Concrete
5. ASTM C231/C231M – Air Content of Freshly Mixed Concrete by the Pressure
Method
6. ASTM C173/C173M – Air Content of Freshly Mixed Concrete by the Volumetric
Method
7. ASTM C31/C31M – Making and Curing Concrete Test Specimens in the Field
Part 1: ASTM C1064 – Temperature of Freshly Mixed Concrete
1. What is the minimum depth of concrete cover required in all directions around the
temperature-measuring sensor?
A) 1 in. [25 mm]
, B) 2 in. [50 mm]
C) 3 in. [75 mm]
D) 4 in. [100 mm]
ASTM C1064 requires a minimum of 3 inches [75 mm] of concrete surrounding the
sensor in all directions to ensure ambient air temperature does not influence the
reading.
2. How long must the temperature-measuring device remain in the freshly mixed
concrete before reading?
A) At least 1 minute
B) A minimum of 2 minutes, or until the reading stabilizes
C) Exactly 5 minutes
D) 30 seconds
The sensor must remain submerged for a minimum of 2 minutes, or until the
temperature reading stabilizes to within 0.5°F [0.3°C] of its final value.
3. What is the required accuracy for the temperature-measuring device used in ASTM
C1064?
A) ± 0.5°F [± 0.3°C]
B) ± 1.0°F [± 0.5°C]
C) ± 1.5°F [± 0.8°C]
D) ± 2.0°F [± 1.0°C]
The temperature measuring device must be accurate to within ± 1.0°F [± 0.5°C]
across its verified operating range.
4. How often must the reference temperature-measuring device (liquid-in-glass) be
calibrated?
A) Every 6 months
B) Every 12 months (annually)
C) Every 2 years
D) Before every pour
, Calibration of the reference device is required at least once every 12 months or
whenever its accuracy is in question.
5. When taking the temperature of concrete with a maximum nominal aggregate size
of 2 inches, which of the following is correct?
A) The concrete must be wet-screened over a 1.5-inch sieve.
B) The temperature measurement must be performed inside the concrete mixer.
C) The temperature can be measured in the transport or placement container
directly, provided there is enough cover.
D) The temperature can only be measured inside a standard cylinder mold.
The test can be conducted in-place or in transport containers as long as the 3-inch
[75 mm] minimum concrete cover is maintained around the sensor.
6. True or False: It is acceptable to measure the temperature of concrete that has
been placed on a dry, subgrade surface.
A) True
B) False
The temperature must be measured before placement to prevent the subgrade
temperature or moisture loss from skewing the results.
7. If the concrete contains aggregate larger than 3 inches [75 mm], what must be
done before measuring the temperature?
A) It may require up to 20 minutes for the temperature of the concrete to
stabilize after mixing.
B) The concrete must be heated with a blowtorch.
C) The test is entirely invalid and must be skipped.
D) Cold water must be added to the mix.
For concretes containing nominal maximum aggregate sizes larger than 3 inches [75
mm], temperature stabilization may take up to 20 minutes.
8. What is the verified temperature range required for the measuring device?
A) 0 to 100°F [-18 to 38°C]
, B) 30 to 120°F [0 to 50°C]
C) 50 to 150°F [10 to 65°C]
D) 32 to 212°F [0 to 100°C]
ASTM C1064 specifies that the device must be capable of measuring fresh concrete
temperatures between 30°F and 120°F [0°C to 50°C].
9. True or False: The temperature-measuring device should be held upright and never
allowed to touch the sides or bottom of the container.
A) True
B) False
The sensor must not contact the container walls or steel reinforcements, as this can
transfer external thermal energy to the sensor.
10. After inserting the temperature sensor into the concrete, what action should the
technician perform to seal the entry point?
A) Pour water over the insertion point.
B) Gently press the concrete around the measuring device to block outside air.
C) Leave a small void around the shaft to vent air.
D) Tap the container 15 times with a mallet.
Pressing the concrete around the device's stem ensures that outside ambient air
does not flow down into the concrete and affect the sensor reading.
Part 2: ASTM C172 – Sampling Freshly Mixed Concrete
11. What is the maximum allowed elapsed time between obtaining the first and final
portions of a composite concrete sample?
A) 5 minutes
B) 15 minutes
C) 20 minutes
D) 30 minutes
ASTM C172 requires that the composite sample be fully collected within a maximum
elapsed time of 15 minutes.
