ACI Concrete Field Testing Technician- Grade I Exam 2024 Questions and with Correct Answers.
6 views 0 purchase
Course
ACI Concrete Field Testing Technician- Grade I
Institution
ACI Concrete Field Testing Technician- Grade I
The sensor of the temperature measuring device shall be submerged a minimum of _____ in. [_____mm] into the freshly mixed concrete. - Answer- 3 in. [75 mm]
The temperature measuring device shall have a capacity of measuring temperature of freshly mixed concrete to +- _____ degrees F [+- _____ C]...
ACI Concrete Field Testing Technician - Grade I Exam 2024 Questions and with Correct Answers. The sensor of the temperature measuring device shall be submerged a minimum of _____ in. [_____mm] into the freshly mixed concrete. - Answer - 3 in. [75 mm] The temperature measuring device shall have a capacity of measuring temperature of freshly mixed concrete to + - _____ degrees F [+ - _____ C] throughout a range of _____. - Answer - 1 degree F [0.5 C], 30 degr ees F to 120 F [0 C to 50 C] For concrete with aggregates less than 3 inches, the thermometer must remain in the fresh concrete sample a minimum of 5 minutes or until the temperature reading stabilizes. A. True B. False - Answer - B. False ASTM C1064 - (Para 7.2) Leave the temperature measuring device in the freshly. mixed concrete for at least 2 min but not more than 5 min The temperature measuring device shall be calibrated _____, or whenever there is a question of _____. - Answer - Annually, accuracy The temperature of concrete may be measured in a wheelbarrow. True or False? - Answer - True The temperature of concrete may be measured in a wall form. True of False - Answer - True A composite sample of concrete is required even if the only purpose for obtaining the sample is to determine temperature. True of False? - Answer - False What must be done to the sample container prior to sampling the concrete? - Answer - Dampen (with water) What must be done to the concrete surrounding the temperature measuring device after the device is submerged in the fresh concrete. - Answer - Gently press the concr ete around the temperature measuring device at the surface of the concrete How long must the temperature measuring device remain in the freshly mixed concrete? - Answer - At least 2 minutes but not more than 5 minutes After the temperature of the concrete is read, what is required? - Answer - Reporting of temperature The temperature of concrete is reported to the nearest _____ degrees F [_____ C] - Answer - 1 degree F [0.5 C] Start molding specimens for strength tests within 30 minutes after fabricating the composite sample. A. True B. False - Answer - B. False ASTM C172 -Para (4.1. 2) - Start molding. specimens for strength tests within 15 min after fabricating the composite sample. According to ASTM C1064, what is one reason to take the temperature of concrete? - Answer - Verify conformance to a specified requirement for temperature of concrete A maximum temperature of freshly mixed concrete is specified in ASTM C1064 . True of False? - Answer - False The sample of concrete use d for temperature determination must be rodded 25 times. True or False? - Answer - False Sampling by this method is required when tests are to be made to determine _____ with specification requirements. - Answer - Compliance This method covers sampling fro m four types of mixtures which are _____, _____, _____, and _____. - Answer - Stationary mixers, paving mixers, revolving drum mixers, and open top mixers The maximum allowable time between obtaining the first and final portions of a composite sample is _____ minutes. - Answer - 15 Portions of a composite sample shall be thoroughly remixed bfore beginning tests on the sample. True of False? - Answer - True The maximum elapsed time allowed between obtaining the final portion of the composite sample and begin ning the tests for slump, temperature, and air content is _____ minutes. - Answer - 5 The molding of strength test specimens shall begin within _____ minutes after fabricating the composite sample. - Answer - 15 The composite concrete sample must be protected from sun, wind, contamination and r apid evaporation. A. True B. False - Answer - A. True ASTM C172 - Para (4.1.2) The concrete sample must be protected from c ontamination and _____. - Answer - Rapid evaporation The minimum size sample for making strength test specimens is _____. - Answer - 28 L (1ft^3) When sampling from a stationary mixer, the batch must be sampled at _____ or more regularly spaced intervals during discharge of the middle portion of the batch - Answer - 2 The composite sample for a paving mixer must represent a minimum of _____ differen t portions of the batch of concrete taken from the pile after discharge. - Answer - 5 When sampling from a revolving drum truck mixer, concrete must be sampled at a minimum of _____ regularly spaced intervals during discharge of the middle portion of this batch. - Answer - 2 Concrete samples from a truck mixer must be obtained before any water or admixtures are added to the mixer at the job site. True or False? - Answer - False
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 Academicaffairs. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $16.49. You're not tied to anything after your purchase.
