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Sample Written Exam QuestionThe method of determining air content of concrete containing lightweight aggregate is
the pressure method.
A. True
B. False - ANS-B. False
Is the following statement true of false?
When making a test cylinder from concrete being used in construction , the field
technician must also measure the slump of the concrete.
A. True
B. False - ANS-A. True
While the technician is checking the slump of the concrete , there is a decided falling
away or shearing off of concrete from one side of the sample. What should the
technician do?
A. Measure the slump directly over the center of the original base of the mold
B. Measure the slump at the average distance above the original center
C. Disregard the test and retest on another portion of the sample
D. None of the above - ANS-C. Disregard the test and retest on another portion of the
sample
Preparation of specimens for transport includes:
A. Determination that at least 8 hour has elapsed since final set
B. Ensuring specimens have not been demolded
C. Allowing the specimen to air dry for at lease 4 hour - ANS-A. Determination that at
least 8 hour has elapsed since final set
If the aggregate correction factor for a given source of fine and coarse aggregate is
found to be 0.2 % in a pressure air meter , and an air content value of 5.0 % is read on
the gage of the same air meter containing concrete with the same aggregate , what is
the correct air content?
A. 3.0 %
, B. 5.2 %
C. 4.8 %
D. 0.4 % - ANS-C. 4.8 %
Strength test specimens transported from the field to the testing laboratory must be:
A. Protection from jarring
B. Protection from moisture loss
C. Protection from freezing
D. A and B only
E. A , B , and C - ANS-E. A , B , and C
Tests for slump and air content must be started within ________ after obtaining the final
portion of the composite sample.
A. 5 min.
B. 10 min.
C. 15 min.
D. 30 min. - ANS-A. 5 min.
The minimum size for sample to be used for strength test is:
A. 14 L ( 1/2 ft³ )
B. 28 L ( 1 ft³ )
C. 57 L ( 2 ft³ )
D. 85 L ( 3 ft³ ) - ANS-B. 28 L ( 1 ft³ )
Is the following statement true or false?
After strike off the measure used to determine density , a small quantity of concrete may
be added to correct a deficiency.
A. True
B. False - ANS-B. False
For normal strength concretes , what temperature range must be maintained for test
cylinders during initial curing?
A. 0 to 16° C [ 32 to 60° F ]
B. 16 to 27° C [ 60 to 80° F ]
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