Exam (elaborations)
ACI WRITTEN EXAM QUESTIONS AND ANSWERS 2024
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ACI WRITTEN EXAM QUESTIONS AND ANSWERS 2024
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ACI WRITTEN EXAMA mallet weighing ____ must be used to tap the sides of the bowl after rodding
each layer - ANSWERS-1.25 +-.5 lb
The sample of concrete used in this test must be obtained in accordance with
ASTM satndard _____ - ANSWERS-C172
The max size aggregate allowed for this test method is ______ - ANSWERS-1.5 in
(37.5mm)
If concrete sample has contains aggregates larger than that allowed for the test
what must be done? - ANSWERS-wet sieved over a 1 in (25mm) sieve
When filling the measuring bowl of the air meter the concrete must be placed in
____ layers - ANSWERS-2
What is the specified number of strokes required when rodding each layer of
concrete - ANSWERS-25
It is necessary to tap the sides of the measuring bowl after each layer has been
rodded - ANSWERS-True
,The initial quantitiy of water and alcohol added to the air meter can be directly
poured into the neck of the top section of the air meter - ANSWERS-False, the
funnel must be used
Upon final filling of the air meter with water, what part of the liquid level should
be adjusted to the zero mark on the meter - ANSWERS-Bottom of the meniscus
How long should the air meter be inverted and agitated - ANSWERS-No more than
five seconds at a time for 45 seconds
How many times does the rolling operation occur - ANSWERS-a minimum of 2, a
max of 3
Why is the isopropyl alcohol added to the meter - ANSWERS-To dispel any foam
that may be on the surface of the water
The direct reading of the final liquid level in the neck of the air meter is estimated
to the nearest _____ - ANSWERS-0.25 percent
If the air content is greater than 9% range of the meter then ____ - ANSWERS-
Calibrated cups of water are added to bring liquid in range
In order for an initial meter reading to be valid the meter must not be leaking the
liquid level must stabilize within 6 minutes and the foam on the surface of the
liquid must not be greater than 2 full percent division - ANSWERS-True
, If less than 1.25 L (2.5 pt) of alcohol are used, the air content is always indicated
by the final meter reading - ANSWERS-False, if air content is more than 9 percent
the number of calibrated cups of must be added
if more than 1.25 L (2.5pt) of alcohol are used the final meter reading is adjusted
using - ANSWERS-a correction factor
When large amounts of alcohol are used the direct reading will tend to indicate a
______ air content - ANSWERS-Higher
The sensor of the temperature measureing device shall be submerged a minimum
of ____ in - ANSWERS-3 (75mm)
The temperature measureing device shall have a capacity of measuring
temperature of freshly mixed conrcrete to +-_____ degrees F throught a range of
_____ - ANSWERS-1(.5 degrees C), 30-120 (0-50 degrees C)
The temperature measuring device shall be calibrated____, or whenever there is
a question of _____ - ANSWERS-annually, accuracy
The temp of concrete may be measured in a wheelbarrow - ANSWERS-true
the temp of concrete may be measured in a wall form - ANSWERS-true
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