2025 -2026 ACI EXAM QUESTIONS
WITH CORRECT ANSWERS
The end of the temperature measuring device must be submerged a minimum of ?-
CORRECT ANSWER -3"
What is the required capability range on the temperature measuring device? - CORRECT ANSWER -
30 degrees F - 120 degrees F
The temperature measuring device shall be verified , or whenever there is a question of
. - CORRECT ANSWER -annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? - CORRECT ANSWER -
TRUE
The temperature of concrete may be measured in a wall form. True or False? - CORRECT ANSWER -
TRUE
A composite sample of concrete is required even if the only purpose for obtaining the sample is to dete
rmine temperature. True or False? - CORRECT ANSWER -FALSE
What must be done to the sample container prior to sampling concrete? - CORRECT ANSWER -
Dampen the surface with water.
What must be done to the concrete surrounding the temperature measuring device after the device is s
ubmerged in the fresh concrete? - CORRECT ANSWER -
Gently push the surrounding concrete back around the temperature measuring device near the surface.
How long must the temperature measuring device remain in the freshly mixed concrete? -
CORRECT ANSWER -2 - 5 minutes.
After the temperature of concrete is read, what is then required. - CORRECT ANSWER -
Report the temperature of the concrete to the nearest 1.0 degree F.
,The temperature of the concrete is reported to the nearest C. F. -
CORRECT ANSWER -0.5 degree C, 1.0 degree F
According to ASTM C1064 what is one reason to take the temperature of concrete? -
CORRECT ANSWER -Verify conformance to a specified requirement.
A maximum temperature of freshly mixed concrete is specified in Test Method C1064. True or False? -
CORRECT ANSWER -FALSE
The sample of concrete used for temperature determination must be rodded 25 times. True or False? -
CORRECT ANSWER -FALSE
What is the reason for pressing concrete around the temperature measuring device? -
CORRECT ANSWER -
So that the ambient air temperature does not influence the measured temperature.
You should remove the temperature measuring device before reporting the reading. TRUE or FALSE? -
CORRECT ANSWER -FALSE
What is the ASTM for measuring temperature on freshly sampled concrete? - CORRECT ANSWER -
C1064
What is the ASTM for Sampling Freshly Mixed Concrete - CORRECT ANSWER -C172
What is the maximum elapsed time for obtaining a composite (two or more part) sample of concrete? -
CORRECT ANSWER -15 Minutes
What should be done to the concrete sample after transporting it to the testing site? -
CORRECT ANSWER -Remix it with a shovel to ensure uniformity.
Within how many minutes should tests be started for slump, air content, and temperature after obtaini
ng a concrete sample? - CORRECT ANSWER -5 minutes
, Test cylinders for strength should be molded within minutes of taking a concrete sample. -
CORRECT ANSWER -15
The concrete sample must be protected from , , sources of rapid , and fr
om . - CORRECT ANSWER -Sun, Wind, Evaporation, Contamination.
What is the minimum concrete sample size to be taken for testing? - CORRECT ANSWER -
28 Liters / 1 ft3 (One CubicAFt)
When sampling from a stationary mixer, how many portions should be taken? - CORRECT ANSWER -
Two or more
When sampling from a stationary mixer, from which portion of the batch should the samples be taken?
- CORRECT ANSWER -The middle portion.
When sampling from a stationary mixer, which two collection methods are acceptable for obtaining a s
ample? - CORRECT ANSWER -1) Diverting the entire flow
2) Passing a receptacle entirely through the discharge stream
When sampling from a Paving Mixer, how many samples are required? - CORRECT ANSWER -
5 samples minimum (combined into one composite sample)
When sampling from a Paving Mixer, how should the sample/s be taken? - CORRECT ANSWER -
Once discharge is complete into a pile.
What should be avoided when taking samples from a Paving Mixer? - CORRECT ANSWER -
Contamination with the Sub-Grade (ground)
When sampling from a Revolving Drum Mixer or Agitator a minimum of how many portions should be t
aken? - CORRECT ANSWER -Two or more (combined into one composite sample)
WITH CORRECT ANSWERS
The end of the temperature measuring device must be submerged a minimum of ?-
CORRECT ANSWER -3"
What is the required capability range on the temperature measuring device? - CORRECT ANSWER -
30 degrees F - 120 degrees F
The temperature measuring device shall be verified , or whenever there is a question of
. - CORRECT ANSWER -annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? - CORRECT ANSWER -
TRUE
The temperature of concrete may be measured in a wall form. True or False? - CORRECT ANSWER -
TRUE
A composite sample of concrete is required even if the only purpose for obtaining the sample is to dete
rmine temperature. True or False? - CORRECT ANSWER -FALSE
What must be done to the sample container prior to sampling concrete? - CORRECT ANSWER -
Dampen the surface with water.
What must be done to the concrete surrounding the temperature measuring device after the device is s
ubmerged in the fresh concrete? - CORRECT ANSWER -
Gently push the surrounding concrete back around the temperature measuring device near the surface.
How long must the temperature measuring device remain in the freshly mixed concrete? -
CORRECT ANSWER -2 - 5 minutes.
After the temperature of concrete is read, what is then required. - CORRECT ANSWER -
Report the temperature of the concrete to the nearest 1.0 degree F.
,The temperature of the concrete is reported to the nearest C. F. -
CORRECT ANSWER -0.5 degree C, 1.0 degree F
According to ASTM C1064 what is one reason to take the temperature of concrete? -
CORRECT ANSWER -Verify conformance to a specified requirement.
A maximum temperature of freshly mixed concrete is specified in Test Method C1064. True or False? -
CORRECT ANSWER -FALSE
The sample of concrete used for temperature determination must be rodded 25 times. True or False? -
CORRECT ANSWER -FALSE
What is the reason for pressing concrete around the temperature measuring device? -
CORRECT ANSWER -
So that the ambient air temperature does not influence the measured temperature.
You should remove the temperature measuring device before reporting the reading. TRUE or FALSE? -
CORRECT ANSWER -FALSE
What is the ASTM for measuring temperature on freshly sampled concrete? - CORRECT ANSWER -
C1064
What is the ASTM for Sampling Freshly Mixed Concrete - CORRECT ANSWER -C172
What is the maximum elapsed time for obtaining a composite (two or more part) sample of concrete? -
CORRECT ANSWER -15 Minutes
What should be done to the concrete sample after transporting it to the testing site? -
CORRECT ANSWER -Remix it with a shovel to ensure uniformity.
Within how many minutes should tests be started for slump, air content, and temperature after obtaini
ng a concrete sample? - CORRECT ANSWER -5 minutes
, Test cylinders for strength should be molded within minutes of taking a concrete sample. -
CORRECT ANSWER -15
The concrete sample must be protected from , , sources of rapid , and fr
om . - CORRECT ANSWER -Sun, Wind, Evaporation, Contamination.
What is the minimum concrete sample size to be taken for testing? - CORRECT ANSWER -
28 Liters / 1 ft3 (One CubicAFt)
When sampling from a stationary mixer, how many portions should be taken? - CORRECT ANSWER -
Two or more
When sampling from a stationary mixer, from which portion of the batch should the samples be taken?
- CORRECT ANSWER -The middle portion.
When sampling from a stationary mixer, which two collection methods are acceptable for obtaining a s
ample? - CORRECT ANSWER -1) Diverting the entire flow
2) Passing a receptacle entirely through the discharge stream
When sampling from a Paving Mixer, how many samples are required? - CORRECT ANSWER -
5 samples minimum (combined into one composite sample)
When sampling from a Paving Mixer, how should the sample/s be taken? - CORRECT ANSWER -
Once discharge is complete into a pile.
What should be avoided when taking samples from a Paving Mixer? - CORRECT ANSWER -
Contamination with the Sub-Grade (ground)
When sampling from a Revolving Drum Mixer or Agitator a minimum of how many portions should be t
aken? - CORRECT ANSWER -Two or more (combined into one composite sample)
