, ACI Concrete Field Testing Technician- Grade I Complete
Studyguide with questions that are well elaborated &
explained through actual answers reinforced with rationales-
a masterpiece of 2026
✓ A technician arrives at a bridge deck pour and needs to check the concrete temperature
directly from a wall form. Is this practice allowed according to the notes?
a) No, only from a wheelbarrow
b) Yes
c) No, only from a truck chute
d) No, only after placing into cylinders
The correct answer is b. Rationale: The notes explicitly state that temperature of
concrete may be measured in a wall form.
✓ 2. During a hot weather concrete placement, you submerge the temperature sensor into
fresh concrete. What is the minimum depth the sensor must be inserted to obtain a valid
reading?
a) 1 inch [25 mm]
b) 2 inches [50 mm]
c) 3 inches [75 mm]
d) 4 inches [100 mm]
The correct answer is c. Rationale: The temperature measuring device sensor must
be submerged a minimum of 3 inches (75 mm) into fresh concrete.
✓ 3. Your supervisor hands you a thermometer and asks if it meets ASTM C1064 accuracy
requirements. What accuracy must the device have throughout the required temperature
range?
a) ±2°F [±1°C] from 40°F to 110°F
, b) ±1°F [±0.5°C] from 30°F to 120°F
c) ±0.5°F [±0.2°C] from 50°F to 100°F
d) ±1.5°F [±0.8°C] from 20°F to 130°F
The correct answer is b. Rationale: The device must measure to ±1°F (±0.5°C)
throughout a range of 30°F to 120°F (0°C to 50°C).
✓ 4. A quality control manager asks how often the temperature measuring device must be
sent out for calibration. What is the required frequency?
a) Every 6 months
b) Before each use
c) Annually
d) Only when dropped or damaged
The correct answer is c. Rationale: The temperature measuring device shall be
calibrated annually, or whenever there is a question of accuracy.
✓ 5. You are called to a jobsite only to measure concrete temperature before a large column
pour. The sample is taken from a single chute discharge point. Do you need a composite
sample for this temperature test alone?
a) Yes, always
b) Only if slump is also required
c) No
d) Only if air content is also required
The correct answer is c. Rationale: A composite sample of concrete is not required if
the only purpose is to determine temperature.
✓ 6. Before obtaining a concrete sample from a revolving drum truck mixer, what must you
do to the sample container according to standard practice?
a) Dry it thoroughly with a cloth
b) Dampen it with water
c) Heat it to ambient temperature
d) Coat it with form oil
The correct answer is b. Rationale: The sample container must be dampened with
water prior to sampling.
, ✓ 7. After submerging the temperature measuring device into fresh concrete, what action
must be taken at the surface of the concrete around the device?
a) Level the surface with a trowel
b) Cover the surface with plastic sheeting
c) Gently press the concrete around the device
d) Tap the surface lightly with the rod
The correct answer is c. Rationale: You must gently press the concrete around the
temperature measuring device at the surface.
✓ 8. You have placed the thermometer into fresh concrete and start your stopwatch. How
long must the device remain submerged before reading the temperature?
a) At least 1 minute but not more than 3 minutes
b) At least 2 minutes but not more than 5 minutes
c) Exactly 3 minutes
d) At least 5 minutes but not more than 10 minutes
The correct answer is b. Rationale: The device must remain in the fresh concrete for
at least 2 minutes but not more than 5 minutes.
✓ 9. After reading the concrete temperature on a digital display, what is the very next thing
you must do according to the procedure?
a) Remix the sample and retest
b) Calibrate the thermometer again
c) Report the temperature
d) Discard the sample immediately
The correct answer is c. Rationale: After the temperature is read, reporting of
temperature is required.
✓ 10. You record a concrete temperature reading of 78.6°F. What value should you report
on your test report?
a) 78.6°F
b) 79°F
c) 78°F
d) 78.5°F
Studyguide with questions that are well elaborated &
explained through actual answers reinforced with rationales-
a masterpiece of 2026
✓ A technician arrives at a bridge deck pour and needs to check the concrete temperature
directly from a wall form. Is this practice allowed according to the notes?
a) No, only from a wheelbarrow
b) Yes
c) No, only from a truck chute
d) No, only after placing into cylinders
The correct answer is b. Rationale: The notes explicitly state that temperature of
concrete may be measured in a wall form.
✓ 2. During a hot weather concrete placement, you submerge the temperature sensor into
fresh concrete. What is the minimum depth the sensor must be inserted to obtain a valid
reading?
a) 1 inch [25 mm]
b) 2 inches [50 mm]
c) 3 inches [75 mm]
d) 4 inches [100 mm]
The correct answer is c. Rationale: The temperature measuring device sensor must
be submerged a minimum of 3 inches (75 mm) into fresh concrete.
✓ 3. Your supervisor hands you a thermometer and asks if it meets ASTM C1064 accuracy
requirements. What accuracy must the device have throughout the required temperature
range?
a) ±2°F [±1°C] from 40°F to 110°F
, b) ±1°F [±0.5°C] from 30°F to 120°F
c) ±0.5°F [±0.2°C] from 50°F to 100°F
d) ±1.5°F [±0.8°C] from 20°F to 130°F
The correct answer is b. Rationale: The device must measure to ±1°F (±0.5°C)
throughout a range of 30°F to 120°F (0°C to 50°C).
✓ 4. A quality control manager asks how often the temperature measuring device must be
sent out for calibration. What is the required frequency?
a) Every 6 months
b) Before each use
c) Annually
d) Only when dropped or damaged
The correct answer is c. Rationale: The temperature measuring device shall be
calibrated annually, or whenever there is a question of accuracy.
✓ 5. You are called to a jobsite only to measure concrete temperature before a large column
pour. The sample is taken from a single chute discharge point. Do you need a composite
sample for this temperature test alone?
a) Yes, always
b) Only if slump is also required
c) No
d) Only if air content is also required
The correct answer is c. Rationale: A composite sample of concrete is not required if
the only purpose is to determine temperature.
✓ 6. Before obtaining a concrete sample from a revolving drum truck mixer, what must you
do to the sample container according to standard practice?
a) Dry it thoroughly with a cloth
b) Dampen it with water
c) Heat it to ambient temperature
d) Coat it with form oil
The correct answer is b. Rationale: The sample container must be dampened with
water prior to sampling.
, ✓ 7. After submerging the temperature measuring device into fresh concrete, what action
must be taken at the surface of the concrete around the device?
a) Level the surface with a trowel
b) Cover the surface with plastic sheeting
c) Gently press the concrete around the device
d) Tap the surface lightly with the rod
The correct answer is c. Rationale: You must gently press the concrete around the
temperature measuring device at the surface.
✓ 8. You have placed the thermometer into fresh concrete and start your stopwatch. How
long must the device remain submerged before reading the temperature?
a) At least 1 minute but not more than 3 minutes
b) At least 2 minutes but not more than 5 minutes
c) Exactly 3 minutes
d) At least 5 minutes but not more than 10 minutes
The correct answer is b. Rationale: The device must remain in the fresh concrete for
at least 2 minutes but not more than 5 minutes.
✓ 9. After reading the concrete temperature on a digital display, what is the very next thing
you must do according to the procedure?
a) Remix the sample and retest
b) Calibrate the thermometer again
c) Report the temperature
d) Discard the sample immediately
The correct answer is c. Rationale: After the temperature is read, reporting of
temperature is required.
✓ 10. You record a concrete temperature reading of 78.6°F. What value should you report
on your test report?
a) 78.6°F
b) 79°F
c) 78°F
d) 78.5°F
