ACI CONCRETE FIELD TESTING TECHNICIAN GRADE 1 AND GRADE
2 EXAM 2026/2027 EACH TEST CONTAINS COMPLETE ACTUAL
QUESTIONS AND CORRECT SOLUTIONS WITH DETAILED
RATIONALES (100% EXPERT VERIFIED ANSWERS) LATEST
UPDATED VERSION 2026 EDITION |GUARANTEED PASS + |FULLL
REVISED ACI CONCRETE FIELD TESTING TECHNICIAN EXAMS
1. According to ASTM C1064, the sensor of the temperature measuring device shall be submerged a
minimum of how many inches into the freshly mixed concrete?
A) 1 inch (25 mm)
B) 2 inches (50 mm)
C) 3 inches (75 mm)
D) 4 inches (100 mm)
CORRECT ANSWER: C
Rationale: ASTM C1064 requires the temperature sensor to be submerged at least 3 inches (75 mm) to
ensure an accurate reading of the concrete’s internal temperature, avoiding surface temperature
variations. This ensures the measurement reflects the true temperature of the concrete mass.
2. The temperature measuring device used for fresh concrete shall be capable of measuring
temperature to within what accuracy?
A) ±0.5°F (±0.3°C)
B) ±1°F (±0.5°C)
C) ±2°F (±1°C)
D) ±5°F (±3°C)
CORRECT ANSWER: B
Rationale: ASTM C1064 specifies that the temperature measuring device must be accurate to ±1°F
(±0.5°C) throughout the required range of 30°F to 120°F. This level of precision is necessary to verify
conformance with specified temperature requirements.
,3. What temperature range must a thermometer used for fresh concrete testing be capable of
measuring?
A) 0°F to 100°F (–18°C to 38°C)
B) 20°F to 110°F (–7°C to 43°C)
C) 30°F to 120°F (–1°C to 49°C)
D) 40°F to 130°F (4°C to 54°C)
CORRECT ANSWER: C
Rationale: ASTM C1064 requires thermometers to be capable of measuring temperatures throughout
the range of 30°F to 120°F (–1°C to 49°C). This range covers typical concrete temperatures encountered
in field conditions, including hot and cold weather concreting.
4. According to ASTM C1064, how often must the temperature measuring device be calibrated?
A) Monthly
B) Quarterly
C) Annually
D) Before each use
CORRECT ANSWER: C
Rationale: ASTM C1064 requires annual calibration of temperature measuring devices, or whenever
there is a question of accuracy. Regular calibration ensures reliable temperature measurements.
5. A composite sample of concrete is required when the only purpose for obtaining the sample is to
determine temperature. True or False?
A) True
B) False
,CORRECT ANSWER: B
Rationale: A composite sample is not required when the sole purpose is temperature determination.
Temperature can be measured directly from a single grab sample without the need for a composite
sample.
6. How long must the temperature measuring device remain in the freshly mixed concrete before
reading the temperature?
A) At least 30 seconds but not more than 2 minutes
B) At least 1 minute but not more than 3 minutes
C) At least 2 minutes but not more than 5 minutes
D) At least 5 minutes but not more than 10 minutes
CORRECT ANSWER: C
Rationale: ASTM C1064 requires the temperature measuring device to remain in the concrete for a
minimum of 2 minutes and a maximum of 5 minutes to allow the sensor to reach equilibrium with the
concrete temperature.
7. After the temperature of the concrete is read, what is required?
A) Discard the sample immediately
B) Reporting of temperature
C) Perform a slump test
D) Rod the sample 25 times
CORRECT ANSWER: B
Rationale: After reading the temperature, the result must be reported to the nearest 1°F (0.5°C).
Proper documentation ensures traceability and quality control.
8. According to ASTM C1064, what is one reason to take the temperature of concrete?
, A) To determine compressive strength
B) To verify conformance to a specified temperature requirement
C) To measure air content
D) To determine workability
CORRECT ANSWER: B
Rationale: One of the primary reasons for measuring concrete temperature is to verify conformance to
a specified requirement for temperature of concrete, such as in hot or cold weather concreting.
9. ASTM C1064 specifies a maximum temperature for freshly mixed concrete. True or False?
A) True
B) False
CORRECT ANSWER: B
Rationale: ASTM C1064 does not specify maximum or minimum temperature limits. It only provides
the method for measuring temperature. Temperature limits are typically specified by project
specifications.
10. According to ASTM C172, what must be done to the sample container prior to sampling the
concrete?
A) Dry thoroughly
B) Heat to ambient temperature
C) Dampen with water
D) Coat with oil
CORRECT ANSWER: C
2 EXAM 2026/2027 EACH TEST CONTAINS COMPLETE ACTUAL
QUESTIONS AND CORRECT SOLUTIONS WITH DETAILED
RATIONALES (100% EXPERT VERIFIED ANSWERS) LATEST
UPDATED VERSION 2026 EDITION |GUARANTEED PASS + |FULLL
REVISED ACI CONCRETE FIELD TESTING TECHNICIAN EXAMS
1. According to ASTM C1064, the sensor of the temperature measuring device shall be submerged a
minimum of how many inches into the freshly mixed concrete?
A) 1 inch (25 mm)
B) 2 inches (50 mm)
C) 3 inches (75 mm)
D) 4 inches (100 mm)
CORRECT ANSWER: C
Rationale: ASTM C1064 requires the temperature sensor to be submerged at least 3 inches (75 mm) to
ensure an accurate reading of the concrete’s internal temperature, avoiding surface temperature
variations. This ensures the measurement reflects the true temperature of the concrete mass.
2. The temperature measuring device used for fresh concrete shall be capable of measuring
temperature to within what accuracy?
A) ±0.5°F (±0.3°C)
B) ±1°F (±0.5°C)
C) ±2°F (±1°C)
D) ±5°F (±3°C)
CORRECT ANSWER: B
Rationale: ASTM C1064 specifies that the temperature measuring device must be accurate to ±1°F
(±0.5°C) throughout the required range of 30°F to 120°F. This level of precision is necessary to verify
conformance with specified temperature requirements.
,3. What temperature range must a thermometer used for fresh concrete testing be capable of
measuring?
A) 0°F to 100°F (–18°C to 38°C)
B) 20°F to 110°F (–7°C to 43°C)
C) 30°F to 120°F (–1°C to 49°C)
D) 40°F to 130°F (4°C to 54°C)
CORRECT ANSWER: C
Rationale: ASTM C1064 requires thermometers to be capable of measuring temperatures throughout
the range of 30°F to 120°F (–1°C to 49°C). This range covers typical concrete temperatures encountered
in field conditions, including hot and cold weather concreting.
4. According to ASTM C1064, how often must the temperature measuring device be calibrated?
A) Monthly
B) Quarterly
C) Annually
D) Before each use
CORRECT ANSWER: C
Rationale: ASTM C1064 requires annual calibration of temperature measuring devices, or whenever
there is a question of accuracy. Regular calibration ensures reliable temperature measurements.
5. A composite sample of concrete is required when the only purpose for obtaining the sample is to
determine temperature. True or False?
A) True
B) False
,CORRECT ANSWER: B
Rationale: A composite sample is not required when the sole purpose is temperature determination.
Temperature can be measured directly from a single grab sample without the need for a composite
sample.
6. How long must the temperature measuring device remain in the freshly mixed concrete before
reading the temperature?
A) At least 30 seconds but not more than 2 minutes
B) At least 1 minute but not more than 3 minutes
C) At least 2 minutes but not more than 5 minutes
D) At least 5 minutes but not more than 10 minutes
CORRECT ANSWER: C
Rationale: ASTM C1064 requires the temperature measuring device to remain in the concrete for a
minimum of 2 minutes and a maximum of 5 minutes to allow the sensor to reach equilibrium with the
concrete temperature.
7. After the temperature of the concrete is read, what is required?
A) Discard the sample immediately
B) Reporting of temperature
C) Perform a slump test
D) Rod the sample 25 times
CORRECT ANSWER: B
Rationale: After reading the temperature, the result must be reported to the nearest 1°F (0.5°C).
Proper documentation ensures traceability and quality control.
8. According to ASTM C1064, what is one reason to take the temperature of concrete?
, A) To determine compressive strength
B) To verify conformance to a specified temperature requirement
C) To measure air content
D) To determine workability
CORRECT ANSWER: B
Rationale: One of the primary reasons for measuring concrete temperature is to verify conformance to
a specified requirement for temperature of concrete, such as in hot or cold weather concreting.
9. ASTM C1064 specifies a maximum temperature for freshly mixed concrete. True or False?
A) True
B) False
CORRECT ANSWER: B
Rationale: ASTM C1064 does not specify maximum or minimum temperature limits. It only provides
the method for measuring temperature. Temperature limits are typically specified by project
specifications.
10. According to ASTM C172, what must be done to the sample container prior to sampling the
concrete?
A) Dry thoroughly
B) Heat to ambient temperature
C) Dampen with water
D) Coat with oil
CORRECT ANSWER: C
