MASONRY FIELD TESTING TECHNICIAN
CERTIFICATION EXAM PREP NEWEST 2026 | ACI
CERIFIED | ALL MODULES COVERED | PASS
GUARANTEED 2026
Question: The sensor of the temperature measuring device shall be submerged a
minimum of _____ inches into the freshly mixed concrete.
A) 1 inch
B) 2 inches
C) 3 inches
D) 4 inches
Correct Answer: C 3 in. [75 mm]
Expert Rationale: The temperature sensor must be submerged at least 3 inches (75 mm)
into the freshly mixed concrete. Understanding this is essential because proper
submersion ensures the sensor measures the internal temperature of the concrete rather
than surface temperature. This depth provides an accurate representation of the concrete's
thermal condition.
Question: The temperature measuring device must be capable of measuring
temperature within what tolerance?
A) ±2°F [±1°C]
B) ±1°F [±0.5°C]
C) ±0.5°F [±0.25°C]
D) ±3°F [±1.5°C]
Correct Answer: B ±1 degree F [0.5 C]
Expert Rationale: The device must measure temperature within ±1°F (±0.5°C).
Understanding this is essential because accurate temperature measurement is critical for
concrete quality control. Temperature affects setting time, strength development, and
workability of concrete.
,Question: The temperature measuring device must be calibrated _____ or whenever
there is a question of accuracy.
A) Monthly
B) Quarterly
C) Annually
D) Biannually
Correct Answer: C Annually
Expert Rationale: Temperature measuring devices must be calibrated annually or
whenever accuracy is questioned. Understanding this is essential because regular
calibration ensures reliable temperature measurements. Inaccurate readings can lead to
improper concrete placement decisions.
Question: A composite sample of concrete is required even if the only purpose for
obtaining the sample is to determine temperature.
A) True
B) False
Correct Answer: B False
Expert Rationale: A composite sample is not required solely for temperature
determination. Understanding this is essential because temperature can be measured
from a single grab sample when that is the only test being performed. Composite samples
are required when multiple tests (slump, air content, strength) are being conducted.
Question: What must be done to the sample container prior to sampling the concrete?
A) Dry it thoroughly
B) Dampen it with water
C) Heat it
D) Clean it with solvent
Correct Answer: B Dampen (with water)
Expert Rationale: The sample container must be dampened with water prior to sampling.
Understanding this is essential because a dry container can absorb water from the
concrete, altering the water-cement ratio and affecting the concrete's properties.
Dampening prevents this water absorption.
, Question: What must be done to the concrete surrounding the temperature measuring
device after the device is submerged?
A) Tap it with a hammer
B) Gently press the concrete around the device at the surface
C) Cover it with a wet cloth
D) Leave it undisturbed
Correct Answer: B Gently press the concrete around the temperature measuring device at
the surface of the concrete
Expert Rationale: The concrete must be gently pressed around the temperature device at
the surface. Understanding this is essential because this ensures good thermal contact
between the sensor and the concrete, providing an accurate temperature reading. It also
prevents air pockets from insulating the sensor.
Question: How long must the temperature measuring device remain in the freshly
mixed concrete?
A) At least 1 minute but not more than 3 minutes
B) At least 2 minutes but not more than 5 minutes
C) At least 5 minutes but not more than 10 minutes
D) At least 10 minutes
Correct Answer: B At least 2 minutes but not more than 5 minutes
Expert Rationale: The device must remain in the concrete for at least 2 minutes but not
more than 5 minutes. Understanding this is essential because this time allows the sensor
to reach thermal equilibrium with the concrete. Insufficient time yields inaccurate
readings.
Question: After the temperature of the concrete is read, what is required?
A) Recording the temperature
B) Reporting the temperature
C) Discarding the sample
D) Retesting the sample
Correct Answer: B Reporting of temperature
CERTIFICATION EXAM PREP NEWEST 2026 | ACI
CERIFIED | ALL MODULES COVERED | PASS
GUARANTEED 2026
Question: The sensor of the temperature measuring device shall be submerged a
minimum of _____ inches into the freshly mixed concrete.
A) 1 inch
B) 2 inches
C) 3 inches
D) 4 inches
Correct Answer: C 3 in. [75 mm]
Expert Rationale: The temperature sensor must be submerged at least 3 inches (75 mm)
into the freshly mixed concrete. Understanding this is essential because proper
submersion ensures the sensor measures the internal temperature of the concrete rather
than surface temperature. This depth provides an accurate representation of the concrete's
thermal condition.
Question: The temperature measuring device must be capable of measuring
temperature within what tolerance?
A) ±2°F [±1°C]
B) ±1°F [±0.5°C]
C) ±0.5°F [±0.25°C]
D) ±3°F [±1.5°C]
Correct Answer: B ±1 degree F [0.5 C]
Expert Rationale: The device must measure temperature within ±1°F (±0.5°C).
Understanding this is essential because accurate temperature measurement is critical for
concrete quality control. Temperature affects setting time, strength development, and
workability of concrete.
,Question: The temperature measuring device must be calibrated _____ or whenever
there is a question of accuracy.
A) Monthly
B) Quarterly
C) Annually
D) Biannually
Correct Answer: C Annually
Expert Rationale: Temperature measuring devices must be calibrated annually or
whenever accuracy is questioned. Understanding this is essential because regular
calibration ensures reliable temperature measurements. Inaccurate readings can lead to
improper concrete placement decisions.
Question: A composite sample of concrete is required even if the only purpose for
obtaining the sample is to determine temperature.
A) True
B) False
Correct Answer: B False
Expert Rationale: A composite sample is not required solely for temperature
determination. Understanding this is essential because temperature can be measured
from a single grab sample when that is the only test being performed. Composite samples
are required when multiple tests (slump, air content, strength) are being conducted.
Question: What must be done to the sample container prior to sampling the concrete?
A) Dry it thoroughly
B) Dampen it with water
C) Heat it
D) Clean it with solvent
Correct Answer: B Dampen (with water)
Expert Rationale: The sample container must be dampened with water prior to sampling.
Understanding this is essential because a dry container can absorb water from the
concrete, altering the water-cement ratio and affecting the concrete's properties.
Dampening prevents this water absorption.
, Question: What must be done to the concrete surrounding the temperature measuring
device after the device is submerged?
A) Tap it with a hammer
B) Gently press the concrete around the device at the surface
C) Cover it with a wet cloth
D) Leave it undisturbed
Correct Answer: B Gently press the concrete around the temperature measuring device at
the surface of the concrete
Expert Rationale: The concrete must be gently pressed around the temperature device at
the surface. Understanding this is essential because this ensures good thermal contact
between the sensor and the concrete, providing an accurate temperature reading. It also
prevents air pockets from insulating the sensor.
Question: How long must the temperature measuring device remain in the freshly
mixed concrete?
A) At least 1 minute but not more than 3 minutes
B) At least 2 minutes but not more than 5 minutes
C) At least 5 minutes but not more than 10 minutes
D) At least 10 minutes
Correct Answer: B At least 2 minutes but not more than 5 minutes
Expert Rationale: The device must remain in the concrete for at least 2 minutes but not
more than 5 minutes. Understanding this is essential because this time allows the sensor
to reach thermal equilibrium with the concrete. Insufficient time yields inaccurate
readings.
Question: After the temperature of the concrete is read, what is required?
A) Recording the temperature
B) Reporting the temperature
C) Discarding the sample
D) Retesting the sample
Correct Answer: B Reporting of temperature
