ACI Aggregate Testing Technician - Level 1 - Section 6
Relative density (specific gravity) (OD) is used when the aggregate is ____ while relative density (specific gravity) (SSD) is used when the aggregate is ______ .
Oven Dry, Saturated Surface-Dry
____ does not include the pore space within ...
ACI Aggregate Testing Technician - Level 1 -
Section 6
Relative density (specific gravity) (OD) is used when the aggregate is ____ while
relative density (specific gravity) (SSD) is used when the aggregate is ______ .
Oven Dry, Saturated Surface-Dry
____ does not include the pore space within particles that is accessible to water.
Apparent specific gravity
There may be a low absorption in aggregates mined below the water table if they
haven't been allowed to dry. True or False?
False; a higher absorption
Equipment needed to carry out the gravimetric procedure includes: 1) _____ ; 2)
______ ; 3) _____ ; and 4) ______ .
Balance, pycnometer, mold, tamper
The balance should hold ____ kg or more and a flask (container) of the type
described in AASHTO ___ is suitable for use.
1, T 133
After the sample of fine aggregate has been dried and cooled, it should be
covered with ____ for ____ hours.
Water, 15 to 19
The sample, after soaking, should be spread on a flat, absorbent surface to dry.
True or False?
False; nonabsorbent surface
Mechanical means such as tumbling and stirring may be used to speed up the
drying process. True or False?
True
There should be some ____ in the sample on the first trial of the cone test.
Surface moisture
When the mold is lifted, the sample will hold its molded shape if there is _____ .
Surface moisture
A surface-dry condition has usually occurred when the aggregate ____ after
molding.
Slumps slightly
Paper towels, colorimetric methods, a sheet of rubber, and 10 drops of a tamper
are part of alternate
tests on materials that do not ______ .
Readily slump
The procedure used in determining the total mass of the pycnometer, sample,
and water includes which of the following:
a) completely filling the pycnometer with water
b) adding saturated surface-dry fine aggregate
c) filling with additional water
d) agitating the pycnometer to form air bubbles
e) adjusting the temperature to 23 ± 1.7 °C
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