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ACI CERTIFICATION EXAM QUESTIONS & ANSWERS
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ACI CERTIFICATION EXAM QUESTIONS & ANSWERS2. 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. -
Answers -False
4. T/F: Samples smaller than 28L (1 cu.ft.) are allowed on routine air content,
temperature, and slump tests. - Answers -True
7. How do you regulate the rate of discharge of the batch from the revolving truck drum
mixer or agitator? - Answers -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? - Answers -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 ________. - Answers -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? - Answers -0.5 inches
16. T/F: The sides of the slump mold should be lightly tapped to consolidate the
concrete in the mold. - Answers -False
18. T/F: ASTM C 1064 defines the maximum recommended temperature for concrete. -
Answers -False
19. The temperature test method must be complete with in _________ after obtaining
the sample. - Answers -5 minutes
20. Each temperature-measuring device should be calibrated ________, or whenever
there is a question of _________. - Answers -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? - Answers -False
26. What is the required shape at the end of the tamping rod? - Answers -rounded to a
hemispherical tip
28. How do you find the density of a concrete batch? - Answers -(mass of measure with
concrete - mass of measure) / volume of measure
29. How do you find the yield of a concrete batch? - Answers -(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 - Answers -False
34. T/F: The petcocks are closed before pumping any air into the chamber on the type B
meter. - Answers -False
36. The sample is obtained in accordance to ASTM C ___________. - Answers -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? - Answers -4.8%
3. T/F: Samples should be taken before 10% or after 90% of the batch has been
discharged. - Answers -False
5. Tests for slump and air content must be started within ____________ after obtaining
the final portion of the composite sample. - Answers -5 minutes
6. Start molding strength test specimens within ________ after fabricating the
composite sample. - Answers -15 minutes
8. The mold is in the shape of a ___________________. - Answers -Frustrum of a
Cone
9. The top diameter is ______ and the diameter at the base is ________. - Answers -4",
8"
12. The maximum size of aggregate allowed for this test is _________. (ASTM C143
Slump) - Answers -1 1/2''
13. When rodding the second and third layers the rod should penetrate through the
layer and into the previous layer________. - Answers -1''
14. The slump of the concrete was determined to be 4 5/16" what should be recorded
as the slump? - Answers -4 1/4''
17. T/F: When rodding the final lift additional concrete must be added to keep excess
concrete above the top of the mold at all times - Answers -True
21. When determining the temperature of fresh concrete, what is the minimum amount
of concrete cover in all directions around the sensor of the TMD? - Answers -3 inches
39. If the sample is vibrated the duration of vibration should last ___________. -
Answers -Until the surface concrete is smooth
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