ACI Concrete Field Testing Technician- Grade I
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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
The maximum allowable time between obtaining the first
and final portions of a composite sample is _____
minutes. - Answer-15
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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
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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
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 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]