ACI CONCRETE FIELD TESTING TECHNICIAN-
GRADE I 2024 LATEST WITH QUESTIONS &
CORRECT ANSWERS GRADED A+
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 degrees F to 120 F [0 C to 50 C]
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)
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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 concrete 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]
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 used 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 from four types of mixtures which are _____, _____, _____, and _____. - ANSWER-Stationary mixers, paving mixers, revolving drum mixers, and open top mixers 2 / 3
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 beginning 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 concrete sample must be protected from contamination 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 _____ different portions of the batch of concrete taken from the pile after discharge. -
ANSWER-5
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