ACI Written Exam Questions with Correct Answers// Verified A
+ Edition.
Collecting a representative sample accurate results
of
concrete to be tested is as
important as executing the test
methods to obtain
This practice covers sampling stationary mixers, paving mixers, revolving mixers, continuous mixers
from four types of
equipment, which are
The elapsed time between 15 minutes
obtaining the first and final
portions of a composite
sample shall not exceed
Portions of a composite sample True
shall be
thoroughly remixed before
beginning tests on the sample.
T/F
Start tests for slump, 5 minutes
temperature, and air content
within how many minutes
after
obtaining the final portion of
the composite sample?
Start molding specimens for 15 minutes
strength tests within how many
minutes after fabricating the
composite sample?
The concrete sample must be rapid evaporation
protected from
contamination and
The minimum size sample for 1 cf
making strength test
specimens is
When sampling from a stationary 2
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, mixer, the batch must be
sampled at __ or more
regularly spaced intervals
during discharge of the middle
portion of the batch.
When sampling from a paving 5
mixer, obtain samples from at
least __ different portions of
the pile and combine them
into one
composite sample for test
purposes.
When sampling from a 2
revolving truck mixer, sample
the concrete by collecting __ or
more portions taken at
regularly spaced intervals
during discharge of the
middle portion of the batch.
Concrete samples from a truck False
mixer must be obtained before
any water or
admixtures are added to the
mixer at the job site. T/F
When the concrete contains wet-screened
aggregate larger than that
permitted for a particular
test method, the sample of
concrete must be ___ before
making the test.
When the concrete contains wet screened over 1-½"
aggregate
larger than allowed for the slump
test, the large aggregate must be
___
The mold for making the slump the frustum of a cone
test is in the shape of
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12
+ Edition.
Collecting a representative sample accurate results
of
concrete to be tested is as
important as executing the test
methods to obtain
This practice covers sampling stationary mixers, paving mixers, revolving mixers, continuous mixers
from four types of
equipment, which are
The elapsed time between 15 minutes
obtaining the first and final
portions of a composite
sample shall not exceed
Portions of a composite sample True
shall be
thoroughly remixed before
beginning tests on the sample.
T/F
Start tests for slump, 5 minutes
temperature, and air content
within how many minutes
after
obtaining the final portion of
the composite sample?
Start molding specimens for 15 minutes
strength tests within how many
minutes after fabricating the
composite sample?
The concrete sample must be rapid evaporation
protected from
contamination and
The minimum size sample for 1 cf
making strength test
specimens is
When sampling from a stationary 2
https://quizlet.com/953458592/aci-written-exam-flash-cards/ 1/
12
, mixer, the batch must be
sampled at __ or more
regularly spaced intervals
during discharge of the middle
portion of the batch.
When sampling from a paving 5
mixer, obtain samples from at
least __ different portions of
the pile and combine them
into one
composite sample for test
purposes.
When sampling from a 2
revolving truck mixer, sample
the concrete by collecting __ or
more portions taken at
regularly spaced intervals
during discharge of the
middle portion of the batch.
Concrete samples from a truck False
mixer must be obtained before
any water or
admixtures are added to the
mixer at the job site. T/F
When the concrete contains wet-screened
aggregate larger than that
permitted for a particular
test method, the sample of
concrete must be ___ before
making the test.
When the concrete contains wet screened over 1-½"
aggregate
larger than allowed for the slump
test, the large aggregate must be
___
The mold for making the slump the frustum of a cone
test is in the shape of
https://quizlet.com/953458592/aci-written-exam-flash-cards/ 2/
12
