ACI Written Exam Questions With Verified
Answers.
The sensor of the temperature measureing device shall be submerged a minimum of ____ in -
answer3 (75mm)
The temperature measureing device shall have a capacity of measuring temperature of freshly
mixed conrcrete to +-_____ degrees F throught a...
The sensor of the temperature measureing device shall be submerged a minimum of ____ in -
answer✔3 (75mm)
The temperature measureing device shall have a capacity of measuring temperature of freshly
mixed conrcrete to +-_____ degrees F throught a range of _____ - answer✔1(.5 degrees C), 30-
120 (0-50 degrees C)
The temperature measuring device shall be calibrated____, or whenever there is a question of
_____ - answer✔annually, accuracy
The temp of concrete may be measured in a wheelbarrow - answer✔true
the temp of concrete may be measured in a wall form - answer✔true
A composite sample of concrete is required even if the only purpose for obtaining the sample is
to determine temp. - 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 temp measuring device after the device has
submerged - answer✔Press concrete around measuring device
How long must the temp device remain in the concrete - answer✔at least 2 minutes (but no more
than 5)
After temp of concrete is read, what then is required - answer✔reporting of temp
the temp of concrete to be measured to the nearest ____degree F - answer✔1 (.5 degree C)
According to the ASTM C1064 what is one reason to take the temp of concrete - answer✔verify
conformance to a specified requirement for temp
A max temp of concrete is specified in ASTM C1064 - answer✔False
The sample of concrete used for temp determination must be rodded 25 times - answer✔False
Sampling by this method is required when tests are to be made to determine ____ with
specification requirements - answer✔compliance
The method covers sampling from four types of mixers which are _____, _____, ____, and
_______ - answer✔stationary mixes, 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 before beginning tests on the sample
- answer✔True
The maximum elapsed time allowed between obtaining the final portion of the composite sample
and beginning the tests for slump, temp, 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 test specimen 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
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 the 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 - answer✔False
The composite sample from a truck mixer must be obtained from the _____ portion of the batch -
answer✔Middle
When the concrete contains aggregate larger than permitted for a particular test method, the
sample fo concrete must be ______ ______ before making the test - answer✔Wet Sieved
The slump test is applicable to plastic concrete with a max aggregate size of ____ in -
answer✔1.5 in (37.5 mm)
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