ACI Test All Answers Correct - What is the maximum duration allowed between the first and final portions of a composite sample
collection?
The maximum allowable time between obtaining the first and last portions of a composite sample is 15
minutes. - Should wet sieving of a concrete sample ...
ACI Test All Answers Correct
- What is the maximum duration allowed between the first and final portions of a composite sample
collection?
The maximum allowable time between obtaining the first and last portions of a composite sample is 15
minutes.
- Should wet sieving of a concrete sample occur after the individual samples are mixed into a
composite?
False. Wet sieving should not be conducted after the samples are combined; it has distinct timing
requirements.
- After obtaining a composite sample, within how many minutes must tests for slump, temperature, and
air content commence?
These tests are required to start within 5 minutes of acquiring the composite sample.
- When must test specimens be molded after the composite sample collection?
The molding of test specimens should occur within 15 minutes after the collection of the composite
sample.
- What precautions should be taken with concrete samples to prevent negative effects?
Concrete samples should be safeguarded from sunlight, wind, rapid evaporation, and contamination.
- What is the minimum volume of concrete sample needed for molding strength test specimens?
A minimum concrete sample size of 28 liters (1 cubic foot) is required for this purpose.
- Is obtaining a representative sample the main goal of the sampling process?
True. Ensuring that the sample is representative is the key objective of the sampling procedure.
- How many portions should be collected from a revolving drum truck mixer during sampling?
Concrete should be taken from 2 or more sections of the batch when sampling from a revolving drum
truck mixer.
, - What circumstances call for wet sieving of concrete?
Wet sieving is necessary if the concrete includes aggregates larger than what is acceptable for testing.
- Is it permissible to use three small containers on the subgrade when sampling from a paving mixer?
False. This method is not acceptable for obtaining the required concrete samples.
---
TEMPERATURE MEASUREMENTS
- How long may it take for temperature stabilization when the nominal maximum size (NMS) of coarse
aggregate exceeds a certain dimension?
It may take up to 20 minutes for the temperature to stabilize when the NMS of coarse aggregate is
greater than 3 inches.
- What size container is necessary to ensure proper temperature measurement in concrete?
The container must be large enough to allow for at least 3 inches (or 3 times the NMS) of concrete to
surround the temperature measuring device on all sides.
- What accuracy should the temperature measuring device have, and what range must it encompass?
The device should accurately measure temperature within ±1°F and cover a temperature range from
30°F to 120°F.
- Is a composite sample required if the only intention is to measure temperature?
True. A composite sample is not necessary for determining temperature alone.
- How frequently should the temperature measuring device be calibrated?
The calibration must be performed annually or whenever there is doubt regarding its accuracy.
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 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 bestscores1. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £8.16. You're not tied to anything after your purchase.
