NCDOT ACI STUDY GUIDE EXAM
QUESTIONS AND ANSWERS 2026
VERIFIED.
A temperature measuring device shall have the capability of measuring the temperature of
freshly mixed concrete in the range of______ degrees
a. 30-120
b. 0-100
c. 50-90
d. 60-80 - ANS 30-120
The temperature measuring device shall have the capability of measuring the temperature of
freshly mixed concrete to ______ degrees
a. 1
b. 5
c. 15
d. 2 - ANS a. 1 degree
A composite sample of concrete is required even if the only purpose for obtaining the sample is
to determine temperature. T/F - ANS False
Leave the Temperature measuring device in the concrete for at least ______ before reading.
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,a. 1 min
b. 2 min
c. 5 min
d. 15 min - ANS b. 2 min
Assuming the course aggregate size is less than 3 in, read the temperature of the concrete
within ______ min after inserting the thermometer.
a. 2
b. 5
c. 15
d. 20 - ANS b. 5 min
The reference temperature measuring device shall be readable and accurate to ______ degrees
a. 0.5
b. 1
c. 5
d. 20 - ANS a. 0.5
When is it necessary to wet sieve a concrete sample. Wet sieving should be performed before
the individual samples are combined into a composite sample. T/F - ANS True
Test for slump, temperature, and air content shall be started within ______ min after obtaining
the final portion of the composite sample.
a. 2
b. 5
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, c. 15
d. 20 - ANS b. 5 min
When sampling from a paver mixer, it is permissible to place shallow containers on the subgrade
in order to obtain the needed portions of concrete. T/F - ANS True
Regulate the rate at which concrete is discharged from a revolving drum truck mixer
by______________.
a. adjusting the size of the gate opening
b. changing the angle of the discharge chute
c. placing a handheld dam in the chute
d. adjusting the rate of revolution of the drum - ANS d. adjusting the rate of revolution of the
drum
After wet sieving a portion of concrete sample. Any aggregate retained on the
sieve______________.
a. shall be remixed with the remaining portion of the original sample
b. shall be discarded
c. should have any mortar on the particles wiped off and added to the sieve material
d. is to be recombined with the sieved material - ANS b. shall be discarded
When sampling from a paving mixer, obtain ______ different portions from the discharge pile.
a. at least 5
b. no more than 5
c. 3-5
d. at least 3 - ANS a. at least 5
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QUESTIONS AND ANSWERS 2026
VERIFIED.
A temperature measuring device shall have the capability of measuring the temperature of
freshly mixed concrete in the range of______ degrees
a. 30-120
b. 0-100
c. 50-90
d. 60-80 - ANS 30-120
The temperature measuring device shall have the capability of measuring the temperature of
freshly mixed concrete to ______ degrees
a. 1
b. 5
c. 15
d. 2 - ANS a. 1 degree
A composite sample of concrete is required even if the only purpose for obtaining the sample is
to determine temperature. T/F - ANS False
Leave the Temperature measuring device in the concrete for at least ______ before reading.
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,a. 1 min
b. 2 min
c. 5 min
d. 15 min - ANS b. 2 min
Assuming the course aggregate size is less than 3 in, read the temperature of the concrete
within ______ min after inserting the thermometer.
a. 2
b. 5
c. 15
d. 20 - ANS b. 5 min
The reference temperature measuring device shall be readable and accurate to ______ degrees
a. 0.5
b. 1
c. 5
d. 20 - ANS a. 0.5
When is it necessary to wet sieve a concrete sample. Wet sieving should be performed before
the individual samples are combined into a composite sample. T/F - ANS True
Test for slump, temperature, and air content shall be started within ______ min after obtaining
the final portion of the composite sample.
a. 2
b. 5
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, c. 15
d. 20 - ANS b. 5 min
When sampling from a paver mixer, it is permissible to place shallow containers on the subgrade
in order to obtain the needed portions of concrete. T/F - ANS True
Regulate the rate at which concrete is discharged from a revolving drum truck mixer
by______________.
a. adjusting the size of the gate opening
b. changing the angle of the discharge chute
c. placing a handheld dam in the chute
d. adjusting the rate of revolution of the drum - ANS d. adjusting the rate of revolution of the
drum
After wet sieving a portion of concrete sample. Any aggregate retained on the
sieve______________.
a. shall be remixed with the remaining portion of the original sample
b. shall be discarded
c. should have any mortar on the particles wiped off and added to the sieve material
d. is to be recombined with the sieved material - ANS b. shall be discarded
When sampling from a paving mixer, obtain ______ different portions from the discharge pile.
a. at least 5
b. no more than 5
c. 3-5
d. at least 3 - ANS a. at least 5
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