Exam (elaborations)
ACI CERTIFICATION EXAM QUESTIONS & ANSWERS
- Course
- Institution
ACI CERTIFICATION EXAM QUESTIONS & ANSWERS
[Show more]
Content preview
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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller GEEKA. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
80461 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now