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What is the specified weight of the mallet used on measures
that are 0.5 ft^3
[14 L] or smaller? - ANSWER-1.25 +- 0.50 lb. [600
+- 200 g]
Measures other than air meter bowls used for this test must
conform to ASTM
_____. - ANSWER-
C29
Air meter bowls used for this test must conform to ASTM _____
and be calibrated for volumee according to ASTM _____. -
ANSWER-C231, C29
The concrete sample must be obtained in accodance with what
ASTM method?
- ANSWER-
C172
,What method of consolidation must be used when the slump
is greater than 3
in. [75 mm]? - ANSWER-
Rodding
What method of consolidation must be used when the slump
is less than 1 in.
(25 mm]? - ANSWER-
Vibration
If rodding is the method of consolidation being used, the
measure must be filled
in how many layers? -
ANSWER-3
For a measure of 0.5 ft^3 [14 L], what is the required number
of strokes of the
tamping rod for consolidation of each layer? -
ANSWER-25
When rodding the middle and the top layers, the tamping rod
should penetrate
into the layer below approximately _____. - ANSWER-
1 in. [25 mm]
If vibration is the method of consolidation, the measure must
be filled in _____
, approximately equal layers. -
ANSWER-2
If, after consolidation of the final layer, the concrete level is 1/2
in. (13 mm) above the top of the measure, what should be
done? - ANSWER-Remove a representative portion of the
excess concrete with a trowel or scoop
After consolidation of the final layer, an excess of concrete
____ above the top
of the measure is considered optimum. - ANSWER-
1/8 in. [3 mm]
After completing the strike-off procedure, what must be done
before weighing
the measure and sample? - ANSWER-Clean off any
excess concrete
The pressure method of determining air content can be
used on concrete
containing _____ _____ aggregate. - ANSWER-
Relatively Dense
The pressure method of determining air content cannot be
used on concrete
containing the following types of aggregates, _____, _____,
_____. - ANSWER-
Lightweight, air-cooled blast furnace slag, or aggregates
of high porosity