The end of the temperature sensing portion of the temperature measuring device is submerged a minimum of __mm [__in.] into the freshly mixed concrete. Answer - 77mm /3in.
The temperature measuring device shall be capable of accurately measuring the temperature of freshly mixed concrete to +- __C...
ACI Concrete Field Testing Technician
exam 2024 with 100% correct answers
The end of the temperature sensing portion of the temperature measuring device is submerged a
minimum of __mm [__in.] into the freshly mixed concrete. Answer ✔✔- 77mm /3in.
The temperature measuring device shall be capable of accurately measuring the temperature of freshly
mixed concrete to +- __C [+__F] throught a range of __. Answer ✔✔- 0.5 C / +-1F / 0-50 Decrees C
The temp. measuring device shall be verified __, or whenever there is a question of __. Answer ✔✔-
Annually / accuracy
The temp of concrete may be measured in a wheelbarrow? T/F Answer ✔✔- True
The temp. of concrete may be measured in a wall form. T/F Answer ✔✔- True
A composite sample of concrete is required even if the only purpose for obtaining the sample is to
determine temp. T/F Answer ✔✔- False
What must be done to the sample container prior to sampling the concrete Answer ✔✔- It must be
dampened with water
What must be done to the concrete surrounding the temp measuring device after the device is
submerged in the fresh concrete? Answer ✔✔- Gently press the concrete at the surface around the
measuring device.
How long must the temperature measuring device remain in the freshly mixed concrete? Answer ✔✔-
At least 2 min., no longer than 5 min.
After the temperature of the concrete is read, what is then required? Answer ✔✔- Reporting of temp.
, The temp. of concrete is reported to the nearest __. Answer ✔✔- 1 degree F
According to ASTM C1064, what is one reason to take the temperature of concrete? Answer ✔✔- to
verify conformance to a specific requirement.
A max. temp. of freshly mixed concrete is specified in ASTM C1064. T/F Answer ✔✔- False
The sample of concrete used for temperature determination must be rodded 25 times. Answer ✔✔-
False
Sampling by this method covers procedures or obtaining representative samples, on which test are to be
performed to determined __ with quality requirements of the specifications under which the concrete is
furnished. Answer ✔✔- Compliance
This method covers sampling from four types of mixers, which are __, __, __, and __. Answer ✔✔-
Stationary mixers / Paving mixers / revolving drum mixers / open top mixers
The elapsed time between obtaining the first and final portions of a composite sample shall not exceed
__ min. Answer ✔✔- 15 min.
Portions of a composite sample shall be thoroughly mixed before beginning test on the sample. T/F
Answer ✔✔- True
Start tests for slump, temp, and air content within __ min. after obtaining the final portion of the
composite sample. Answer ✔✔- 5 min.
start molding specimens fr strength tests within __ after fabrication the composite sample. Answer ✔✔-
15 min.
The concrete sample must be protected from contamination and __. Answer ✔✔- Rapid evaporation
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