ACI Certification Practice Exam Questions
T/F: The method of determining air content of concrete containing lightweight aggregate is the
pressure method - ANS-False
T/F: When making a test cylinder from concrete being used in construction, the field technician
must also measure the slump of the concrete. - ANS-True
While the technician is checking the slump of the concrete, there is a decided falling away or
shearing off of the concrete from one side of the sample. What should the technician do? -
ANS-Disregard the test and retest on another portion of the sample
Preparation of specimens for transport includes: - ANS-Determination that at least 8 hours has
elapsed since final set
If the aggregate correction factor for a given source of fine and coarse aggregate is found to be
.2% in a pressure air meter, and an air content value of 5% is read on the gage of the same air
meter containing concrete with the same aggregate, what is the correct air content? - ANS-4.8%
Strength test specimens transported from the field to the testing laboratory must be -
ANS-Protected from jarring, Protected from moisture loss, and Protected from freezing
Tests for slump and air content must be started within ____ min after obtaining the final portion
of the composite sample - ANS-5 min
The minimum size for samples to be used for strength tests is - ANS-28L (1 ft^2)
T/F: After strike off of the measure used to determine density, a small quantity of concrete may
be added to correct for a deficiency. - ANS-False
For normal strength concretes, what temperature range must be maintained for test cylinders
during initial curing? - ANS-16 to 27 Celsius (60 to 80 F)
T/F: When the concrete contains large aggregate, the testing technician should wet-sieve the
sample before making density (unit weight) tests for use in yield computations - ANS-False
When determining the temperature of fresh concrete, what is the minimum amount of concrete
cover in all directions around the sensor of the temperature measuring device - ANS-75mm (3in)
T/F: The sides of the slump mold should be lightly tapped to consolidate the concrete in the
mold - ANS-False
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