ACI written exam questions
False. Relatively dense - ANS-The method of determining air content of concrete containing
lightweight aggregate is the pressure method
True - ANS-Is the following statement true or false? When making a test cylinder from concrete
being used in construction, the field technician must also measure the slump of the concrete.
Disregard the test and retest on another portion of the sample. - ANS-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?
Determination that at least 8 hours has elapsed since final set. - ANS-Preparation of specimens
for transport includes:
4.8% - ANS-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 gauge
of the same air meter containing concrete with the same aggregate, what is the correct air
content?
Protected from jarring, moisture loss, and freezing - ANS-Strength test specimens transported
from the field to the testing laboratory must be:
5 MInutes - ANS-Tests for slump and air content must be started within ________ after
obtaining the final portion of the composite sample.
1 cubic foot - ANS-The minimum size for samples to be used for strength test is:
False - ANS-Is the following statement true or false? After strike off of the measure used to
determine density, a small quantity of concrete may be added to correct a deficiency.
60 to 80 degrees f (16 to 27 degrees C) - ANS-For normal strength concretes, what temperature
range must be maintained for test cylinders during initial curing?
False - ANS-Is the following statement true or false? When concrete contains large aggregate,
the testing technician should wet-sieved the sample before making density (unit weight) tests for
use in yield computations.
3 inches ( 75MM) - ANS-When determining the temperature of fresh mixed concrete, what is the
minimum amount of concrete cover in all directions around the sensor of the temperature
measuring device?
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