ACI CONCRETE FIELD TESTING TECHNICIAN -
GRADE I EXAM
Actual Questions and Answers
Expert-Verified Explanation
This Exam contains:
✪ Multiple-choice and True/False Format
✪ Expert-Verified Explanations
✪ Verified with Trusted Textbooks
1. The sensor of the temperature measuring device shall be submerged a minimum of _____ in.
[_____mm] into the freshly mixed concrete.
A. 1 in. [25 mm]
B. 2 in. [50 mm]
C. 3 in. [75 mm]
D. 4 in. [100 mm]
Answer: C
EXPLANATION: ASTM C1064 specifies that the temperature sensor must be submerged at least 3 inches
(75 mm) to obtain an accurate temperature of the fresh concrete.
2. The temperature measuring device must have a measuring range of:
A. 0–100°F
B. 30–120°F
C. 50–150°F
D. 20–110°F
Answer: B
EXPLANATION: Per ASTM C1064, the device must measure from 30°F to 120°F [0°C to 50°C] and be
accurate within ±1°F [0.5°C].
3. The temperature measuring device must be calibrated:
A. Monthly
B. Biannually
C. Annually
D. Never
Answer: C
EXPLANATION: Annual calibration ensures accuracy unless a malfunction is suspected.
4. The temperature of concrete may be measured in a wheelbarrow.
A. True
,B. False
Answer: A
EXPLANATION: ASTM C1064 allows concrete temperature measurement in a wheelbarrow if the sample
is representative.
5. A composite sample of concrete is required to measure temperature only.
A. True
B. False
Answer: B
EXPLANATION: A composite sample is not required solely for temperature measurement.
6. Prior to sampling, the sample container must be:
A. Dry and clean
B. Heated
C. Damped
D. Insulated
Answer: C
EXPLANATION: Moistening prevents absorption and maintains sample integrity.
7. After placing the sensor in concrete, the surrounding concrete should be:
A. Compressed with a rod
B. Pressed gently
C. Removed
D. Ignored
Answer: B
EXPLANATION: Gentle pressing around the sensor ensures contact for accurate readings.
8. The temperature device must remain in concrete for:
A. 10–15 seconds
B. 30 seconds
C. 2–5 minutes
D. 6–10 minutes
Answer: C
EXPLANATION: This period allows stabilization of the reading per ASTM standards.
9. Temperature readings must be reported to the nearest:
A. 0.1°F
B. 0.5°F
C. 1°F
, D. 2°F
Answer: C
EXPLANATION: ASTM C1064 specifies reporting to the nearest 1°F [0.5°C].
10. A maximum allowable concrete temperature is specified in ASTM C1064.
A. True
B. False
Answer: B
EXPLANATION: The standard does not define a maximum; it measures temperature only.
11. The slump test mold has a height of:
A. 6 in.
B. 8 in.
C. 10 in.
D. 12 in.
Answer: D
EXPLANATION: The mold is a frustum of a cone 12 inches tall.
12. The slump test mold is shaped like:
A. A cylinder
B. A cube
C. A frustum of a cone
D. A cone
Answer: C
EXPLANATION: This shape aids in lifting the mold cleanly for accurate slump measurement.
13. How many layers is the slump mold filled in?
A. 2
B. 3
C. 4
D. 1
Answer: B
EXPLANATION: ASTM C143 requires filling the mold in three equal layers.
14. Each layer in the slump mold must be rodded how many times?
A. 10
B. 15
C. 25
D. 30
GRADE I EXAM
Actual Questions and Answers
Expert-Verified Explanation
This Exam contains:
✪ Multiple-choice and True/False Format
✪ Expert-Verified Explanations
✪ Verified with Trusted Textbooks
1. The sensor of the temperature measuring device shall be submerged a minimum of _____ in.
[_____mm] into the freshly mixed concrete.
A. 1 in. [25 mm]
B. 2 in. [50 mm]
C. 3 in. [75 mm]
D. 4 in. [100 mm]
Answer: C
EXPLANATION: ASTM C1064 specifies that the temperature sensor must be submerged at least 3 inches
(75 mm) to obtain an accurate temperature of the fresh concrete.
2. The temperature measuring device must have a measuring range of:
A. 0–100°F
B. 30–120°F
C. 50–150°F
D. 20–110°F
Answer: B
EXPLANATION: Per ASTM C1064, the device must measure from 30°F to 120°F [0°C to 50°C] and be
accurate within ±1°F [0.5°C].
3. The temperature measuring device must be calibrated:
A. Monthly
B. Biannually
C. Annually
D. Never
Answer: C
EXPLANATION: Annual calibration ensures accuracy unless a malfunction is suspected.
4. The temperature of concrete may be measured in a wheelbarrow.
A. True
,B. False
Answer: A
EXPLANATION: ASTM C1064 allows concrete temperature measurement in a wheelbarrow if the sample
is representative.
5. A composite sample of concrete is required to measure temperature only.
A. True
B. False
Answer: B
EXPLANATION: A composite sample is not required solely for temperature measurement.
6. Prior to sampling, the sample container must be:
A. Dry and clean
B. Heated
C. Damped
D. Insulated
Answer: C
EXPLANATION: Moistening prevents absorption and maintains sample integrity.
7. After placing the sensor in concrete, the surrounding concrete should be:
A. Compressed with a rod
B. Pressed gently
C. Removed
D. Ignored
Answer: B
EXPLANATION: Gentle pressing around the sensor ensures contact for accurate readings.
8. The temperature device must remain in concrete for:
A. 10–15 seconds
B. 30 seconds
C. 2–5 minutes
D. 6–10 minutes
Answer: C
EXPLANATION: This period allows stabilization of the reading per ASTM standards.
9. Temperature readings must be reported to the nearest:
A. 0.1°F
B. 0.5°F
C. 1°F
, D. 2°F
Answer: C
EXPLANATION: ASTM C1064 specifies reporting to the nearest 1°F [0.5°C].
10. A maximum allowable concrete temperature is specified in ASTM C1064.
A. True
B. False
Answer: B
EXPLANATION: The standard does not define a maximum; it measures temperature only.
11. The slump test mold has a height of:
A. 6 in.
B. 8 in.
C. 10 in.
D. 12 in.
Answer: D
EXPLANATION: The mold is a frustum of a cone 12 inches tall.
12. The slump test mold is shaped like:
A. A cylinder
B. A cube
C. A frustum of a cone
D. A cone
Answer: C
EXPLANATION: This shape aids in lifting the mold cleanly for accurate slump measurement.
13. How many layers is the slump mold filled in?
A. 2
B. 3
C. 4
D. 1
Answer: B
EXPLANATION: ASTM C143 requires filling the mold in three equal layers.
14. Each layer in the slump mold must be rodded how many times?
A. 10
B. 15
C. 25
D. 30
