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ACI Concrete Test| Questions and 100% Correct Answers| Latest Update
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ACI Concrete Test| Questions and 100%Correct Answers| Latest Update
What needs to be done if the concrete contains aggregate larger than the appropriate size of
the molds or equipment being used - ANSWER Wet-sieve the sample
It is good to _______ concrete before any test - ANSWER Re-mix
Regulate the rate of discharge of the concrete by the ____ __ ____________ of the drumb and
not by the size of the gate opening - ANSWER Rate of Revolution
What procedures are required between taking the sample from the mixer and preforming tests
a) transport to place where tests will be preformed
b) combine and remix with a shovel
c) both a & b
d) Grab sample from the top - ANSWER c) both a & b
If sampling from a concrete pump
a) Always obtain sample at point of placement (end of line pump)
b) always sample from the mixed before the concrete is discharge in the pump hopper
c) always pick the easiest and safest way possible
d) specifications may determine points of sampling - ANSWER d) specifications may
determine points of sampling
,When strength tests are requires, the minumum sample size of the sample will be - ANSWER 1
cubic foot
how large is a slump mold - ANSWER 4 inches to the top diameter, 8 inches bottom diameter
, and 12 inches high
How long should you complete the slump test in - ANSWER 2 and a half mins
Fill the mold in 3 approximately equal layers by ___________ - ANSWER Volume
Rod each layer of the slump mold ____ times - ANSWER 25
when rodding, penetrate previous layer approximately how deep - ANSWER 1 inch
With one smooth motion without twisting the mold Raise the mold how many seconds -
ANSWER 5 plus or minus 2 seconds
Measure slump to the nearest _____ inch - ANSWER 1/4
Measure the from the top of the cone to the _________ ________ of the concrete - ANSWER
Displaced center
Container size depends on - ANSWER Maximum normal aggregate
When do you need to choose to rod or vibrate concrete - ANSWER Rod when greater than
3 inches; optional between 1 - 3 inches; vibrate if less than 1 inch
When filling the air meter the concrete should have an excess of how many inches - ANSWER
1/8th
, Define relative yield - ANSWER Ratio of the actual volume of concrete obtained, to the
volume designed for the batch
Aggregates must be _______ dense or __________ - ANSWER Relatively dense; normal
Never continue vibration long enough to cause the escape of ______ from a sample - ANSWER
Froth
If water enters the air chamber on a Pressure method it must be - ANSWER - bled from the
air chamber through the bleeded valve followed by several strokes of the pump
- Pressure released by opening both petcocks before removing the cover
Volumetric method can be used for _______ of aggregate - ANSWER any type
Tapping the side of concrete molds can be done with both.... - ANSWER a rubber mallet or an
open hand
Where do you mark the concrete specimen molds?T - ANSWER On the sides not on the cap
In standard initial curing Immediately store the specimens for up to 48 hours in a temperature
range between __ and __ degrees Fahrenheit - ANSWER 60 and 80
Upon completion of initial curing and within 30 mins after removing the molds from the
concrete, you must cure all speciments with free water maintained on tehir surfaces at all
times at a temperature of ______degrees F plus or minus ____ degrees F - ANSWER 73.5 plus
or minus 3.5
Max aggregate for slump test - ANSWER 1.5"
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