ACI CERTIFICATION EXAM 650+ QUESTIONS &
CORRECT ANSWERS LATEST 2025
2. T/F: When the concrete contains large aggregate, the testing technician should
wet-sieve the sample before making unit weight tests for use in yield computations.
- ANSWER-False
4. T/F: Samples smaller than 28L (1 cu.ft.) are allowed on routine air content,
temperature, and slump tests. - ANSWER-True
7. How do you regulate the rate of discharge of the batch from the revolving truck
drum mixer or agitator? - ANSWER-By the rate of revolution of the drum
10. While the technician is checking the slump of the concrete, there is a decided
falling away or shearing off of the concrete from one side of the sample. What
should the technician do? - ANSWER-Disregard the test and retest on another
portion of the sample
11. The mold is filled in three equal layers by volume, which makes the first third
at _______, and the second third at ________. - ANSWER-2 5/8, 6 1/8
15. What is the difference allowed by ACI when certifying an individual test using
a plastic slump cone vs. a metal slump cone? - ANSWER-0.5 inches
16. T/F: The sides of the slump mold should be lightly tapped to consolidate the
concrete in the mold. - ANSWER-False
,18. T/F: ASTM C 1064 defines the maximum recommended temperature for
concrete. - ANSWER-False
19. The temperature test method must be complete with in _________ after
obtaining the sample. - ANSWER-5 minutes
20. Each temperature-measuring device should be calibrated ________, or
whenever there is a question of _________. - ANSWER-annually, accuracy
23. T/F: After strike off of the measure used to determine density, a small quantity
of concrete may be added to correct a deficiency? - ANSWER-False
26. What is the required shape at the end of the tamping rod? - ANSWER-rounded
to a hemispherical tip
28. How do you find the density of a concrete batch? - ANSWER-(mass of
measure with concrete - mass of measure) / volume of measure
29. How do you find the yield of a concrete batch? - ANSWER-(mass of all
materials batched / (density of concrete * 27))
33. T/F: Test method ASTM C231 is intended for use with all concretes and
aggregates for which an aggregate correction factor can be determined -
ANSWER-False
34. T/F: The petcocks are closed before pumping any air into the chamber on the
type B meter. - ANSWER-False
,36. The sample is obtained in accordance to ASTM C ___________. - ANSWER-
172
37. If the aggregate correction factor for a given source of fine and coarse
aggregate is found to be 0.2% in a pressure air meter, and an air content value of
5.0% is read on the gauge of the same air meter containing concrete with the same
aggregate, what is the correct air content? - ANSWER-4.8%
39. If the sample is vibrated the duration of vibration should last ___________. -
ANSWER-Until the surface concrete is smooth
40. The maximum size aggregate for this test is _________. - ANSWER-2''
41. If the aggregate is too large, it must be ________________. - ANSWER-Wet
sieved over the 1 1/2" sieve
42. The minimum size of the measure is ________________________. -
ANSWER-Dependant upon the nominal maximum coarse aggregate size
43. At the end of the pressure method procedure, how is the pressure released from
the Type B air meter? - ANSWER-Opening both petcocks
46. T/F: ASTM 173 is appropriate for testing concretes containing lightweight
aggregates. - ANSWER-True
47. T/F: ASTM 173 specifies that at the very end of the test the tester must make
sure that there are portions undisturbed in the bottom of the bowl, if so the test is
valid. - ANSWER-False
, 48. The maximum size aggregate for this test is _________. - ANSWER-1 1/2''
49. If the second reading after rolling and rocking differs by more than 0.25% from
the first, _______________. - ANSWER-Rock and roll the meter again
50. You added 2 pints of alcohol to the roll-a-meter before you started. Your final
reading after competing the test is 5.5% air. What is the recorded air reading? -
ANSWER-5.5% air
52. T/F: Unless otherwise specified, strength test specimens molded from concrete
having a slump less than 1" must be consolidated by vibration. - ANSWER-True
54. Preparation of specimens for transport includes - ANSWER-Determining that
at least 8 hours has elapsed since final set
56. The minimum size of sample when strength test specimens are molded is -
ANSWER-1 cuft
57. For concrete mixtures with a specified strength greater than 6000 psi the initial
curing temperature should be - ANSWER-68-78 degrees F
58. If the specimens are standard cured, the resulting strength test data when the
specimens are tested can be used for the following purposes. - ANSWER-
Acceptance Testing, Checking adequacy of mixture proportions, and Quality
Control
60. When the specified strength of concrete is under 6000 psi, what temperature
range should they be stored in for the first 48 hours? - ANSWER-60-80 degrees F
CORRECT ANSWERS LATEST 2025
2. T/F: When the concrete contains large aggregate, the testing technician should
wet-sieve the sample before making unit weight tests for use in yield computations.
- ANSWER-False
4. T/F: Samples smaller than 28L (1 cu.ft.) are allowed on routine air content,
temperature, and slump tests. - ANSWER-True
7. How do you regulate the rate of discharge of the batch from the revolving truck
drum mixer or agitator? - ANSWER-By the rate of revolution of the drum
10. While the technician is checking the slump of the concrete, there is a decided
falling away or shearing off of the concrete from one side of the sample. What
should the technician do? - ANSWER-Disregard the test and retest on another
portion of the sample
11. The mold is filled in three equal layers by volume, which makes the first third
at _______, and the second third at ________. - ANSWER-2 5/8, 6 1/8
15. What is the difference allowed by ACI when certifying an individual test using
a plastic slump cone vs. a metal slump cone? - ANSWER-0.5 inches
16. T/F: The sides of the slump mold should be lightly tapped to consolidate the
concrete in the mold. - ANSWER-False
,18. T/F: ASTM C 1064 defines the maximum recommended temperature for
concrete. - ANSWER-False
19. The temperature test method must be complete with in _________ after
obtaining the sample. - ANSWER-5 minutes
20. Each temperature-measuring device should be calibrated ________, or
whenever there is a question of _________. - ANSWER-annually, accuracy
23. T/F: After strike off of the measure used to determine density, a small quantity
of concrete may be added to correct a deficiency? - ANSWER-False
26. What is the required shape at the end of the tamping rod? - ANSWER-rounded
to a hemispherical tip
28. How do you find the density of a concrete batch? - ANSWER-(mass of
measure with concrete - mass of measure) / volume of measure
29. How do you find the yield of a concrete batch? - ANSWER-(mass of all
materials batched / (density of concrete * 27))
33. T/F: Test method ASTM C231 is intended for use with all concretes and
aggregates for which an aggregate correction factor can be determined -
ANSWER-False
34. T/F: The petcocks are closed before pumping any air into the chamber on the
type B meter. - ANSWER-False
,36. The sample is obtained in accordance to ASTM C ___________. - ANSWER-
172
37. If the aggregate correction factor for a given source of fine and coarse
aggregate is found to be 0.2% in a pressure air meter, and an air content value of
5.0% is read on the gauge of the same air meter containing concrete with the same
aggregate, what is the correct air content? - ANSWER-4.8%
39. If the sample is vibrated the duration of vibration should last ___________. -
ANSWER-Until the surface concrete is smooth
40. The maximum size aggregate for this test is _________. - ANSWER-2''
41. If the aggregate is too large, it must be ________________. - ANSWER-Wet
sieved over the 1 1/2" sieve
42. The minimum size of the measure is ________________________. -
ANSWER-Dependant upon the nominal maximum coarse aggregate size
43. At the end of the pressure method procedure, how is the pressure released from
the Type B air meter? - ANSWER-Opening both petcocks
46. T/F: ASTM 173 is appropriate for testing concretes containing lightweight
aggregates. - ANSWER-True
47. T/F: ASTM 173 specifies that at the very end of the test the tester must make
sure that there are portions undisturbed in the bottom of the bowl, if so the test is
valid. - ANSWER-False
, 48. The maximum size aggregate for this test is _________. - ANSWER-1 1/2''
49. If the second reading after rolling and rocking differs by more than 0.25% from
the first, _______________. - ANSWER-Rock and roll the meter again
50. You added 2 pints of alcohol to the roll-a-meter before you started. Your final
reading after competing the test is 5.5% air. What is the recorded air reading? -
ANSWER-5.5% air
52. T/F: Unless otherwise specified, strength test specimens molded from concrete
having a slump less than 1" must be consolidated by vibration. - ANSWER-True
54. Preparation of specimens for transport includes - ANSWER-Determining that
at least 8 hours has elapsed since final set
56. The minimum size of sample when strength test specimens are molded is -
ANSWER-1 cuft
57. For concrete mixtures with a specified strength greater than 6000 psi the initial
curing temperature should be - ANSWER-68-78 degrees F
58. If the specimens are standard cured, the resulting strength test data when the
specimens are tested can be used for the following purposes. - ANSWER-
Acceptance Testing, Checking adequacy of mixture proportions, and Quality
Control
60. When the specified strength of concrete is under 6000 psi, what temperature
range should they be stored in for the first 48 hours? - ANSWER-60-80 degrees F
