ACI Aggregate Testing Technician - Level 1 - Section 5
The method is appropriate for coarse but not ____ aggregate.
Lightweight
SSD refers to _____ - _____ - _____ condition.
saturated-surface-dry
To calculate the volume of aggregate in a mixture (including the voids between the particles) i...
ACI Aggregate Testing Technician - Level 1 -
Section 5
The method is appropriate for coarse but not ____ aggregate.
Lightweight
SSD refers to _____ - _____ - _____ condition.
saturated-surface-dry
To calculate the volume of aggregate in a mixture (including the voids between
the particles) is to determine the ______.
Bulk specific gravity
When the mass of the water within the voids after 24-hour absorption is included
in the volume of aggregate, you are calculating the ______.
Relative specific gravity (SSD)
Computing the impermeable portion of the aggregate is finding the _____.
Apparent specific gravity
The laboratory standard for absorption is the level obtained after ____ of soaking.
15 hr
Absorption values pertain to the ____ in the mass of the aggregate due to ____
absorbed in the pores.
Change, water
Forms of conditioning (besides the 15-hr soak) for which this test may be used
include ______ and _____.
Boiling water, vacuum saturation
Aggregate is considered "dry" when it has been at 230 ± 9°F long enough for all
uncombined water to be removed by reaching a constant mass. True or False?
True
In sampling, all aggregate not passing a 2.36 mm sieve by dry sieving should be
retained. True or False?
False; all not passing a 4.75 mm sieve
When material is tested in separate size fractions, the minimum mass of the
sample in each fraction should be the ______ between the prescribed maximum
and minimum sizes of the fraction.
Difference
In carrying out the procedure, dry the sample at ________ at room temperature
for ____ hr, and immerse in water at for ____ hr.
230 ± 9°F, cool, 1-3, room temperature, 24 ± 4 hr
Under some conditions the initial drying period and the 15-hr soak may be
skipped. True or False?
True
When aggregate isn't oven dried before soaking, the absorption and relative
density (specific gravity) (SSD) values may be ______ .
Higher
These values are higher because the larger particles (75 mm plus) require a
shorter soaking period to absorb the moisture. True or False?
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