ASTM C 173, Air Content – Volumetric Flashcards
It is permissible to use ASTM C 173 to determine the air content of fresh concrete made with
A. dense aggregate only.
B. lightweight aggregates only.
C. any type of aggregate.
D. highly porous aggregates
any type of aggregate
ASTM C 173 measures the total volume of air present in
A. both paste (mortar) fraction and aggregates.
B. the mortar fraction only.
C. porous, lightweight aggregate particles.
D. the aggregate fraction only.
the mortar fraction only
The purpose for adding isopropyl alcohol to the volumetric meter is to
A. fill the meter more quickly.
B. reduce costs, as alcohol is cheaper than tap water.
C. help the paste separate from the bowl when dumped out at the end of the test.
D. help dissolve the foam that can be created during the test
help dissolve the foam that can be created during the test.
When the coarse aggregate of a concrete mixture can be retained on a 1‐1/2 inch sieve, wet sieve a sufficient amount of material for the air content test (ASTM C 173) over a ______ inch sieve.
A. 1/2
B. 3/4
C. 1
D. 1‐1/2
1
The bowl of the volumetric meter is filled in _____ layer(s) of approximately equal volume.
A. 1
B. 2
C. 3
D. 4
2
Excess concrete above the rim of the bowl is struck off using
A. a strike‐off bar.
B. a strike‐off plate.
C. the tamping rod.
D. either a strike‐off bar or strike‐off plate.
a strike-off bar
Prior to adding any isopropyl alcohol to the meter, it is necessary to add at least _____ of water to the meter.
A. 1 cup
B. 1 pint
C. 1 quart
D. 1 gallon
1 pint
During the inversion and shaking processes, the minimum total of time that the meter should be inverted is
A. 5 seconds.
B. 20 seconds.
C. 45 seconds.
D. 1 minute.
45 seconds
During the inversion and shaking processes, the maximum total of time that the meter should be inverted is
A. 5 seconds.
B. 30 seconds.
C. 45 seconds.
D. 1 minute.
5 seconds
The rolling process should be continued for approximately
A. 5 seconds.
B. 30 seconds.
C. 45 seconds.
D. 1 minute.
1 minute
The liquid level in the neck of the meter is considered stable when
A. two readings are within 0.25% of each other.
B. a reading can be taken to the nearest 0.25%.
C. there is less than 2 percent increments of foam in the neck.
D. the liquid level does not change more than 0.25% in 2 minutes.
the liquid level does not change more than 0.25% in 2 minutes
Whenever a reading of the liquid level is taken, the reading is rounded to the nearest
A. 0.25%
B. 0.50%
C. 1%
D. 0.1%
0.25%
A test must be discarded if the amount of foam present in the neck is equivalent to _____percent air content divisions, or more, over the liquid level
A. 0.25
B. 0.50
C. 1
D. 2
2
Confirmation of the initial meter reading is obtained when the difference between the initial and final meter readings are within ____ of each other
A. 1%
B. 0.10%
C. 0.50%
D. 0.25%
0.25%
When taking a reading of the liquid level, read to the
A. top of the meniscus.
B. top of the foam.
C. bottom of the meniscus.
D. bottom of the foam.
bottom of the meniscus