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ACI CERTIFICATION- CONCRETE FIELD TESTING TECHNICIAN GRADE 1 CP-1 (12)
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ACI CERTIFICATION- CONCRETE FIELD TESTING TECHNICIAN GRADE 1 CP-1 (12)
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ACI CERTIFICATION- CONCRETE FIELD TESTINGTECHNICIAN GRADE 1 CP-1 (12)
ASTM C1064 - Answers -Standard Test Method For Temperature of Freshly Mixed
Hydraulic-Cement Concrete
The sensor of the temperature measuring device shall be submerged a minimum of
______ inches into the freshly mixed concrete. - Answers -3"
The temperature measuring device shall have a capacity of measuring temperature of
freshly mixed concrete to ± ______ °F throughout a range of ____________. - Answers
-1 degree, 30 degrees to 120 degrees
The temperature measuring device shall be calibrated ______ , or whenever there is a
question of ______ . - Answers -Annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? -
Answers -True
The temperature of concrete may be measured in a wall form. True or False? - Answers
-True
What must be done to the sample container prior to sampling the concrete? - Answers -
Dampen with water
What must be done to the concrete surrounding the temperature measuring device after
the device is submerged in the fresh concrete? - Answers -Close off air voids by gently
pressing the concrete around the device
The molding of strength test specimens shall begin within _____ minutes after
fabricating the composite
sample. - Answers -15
The concrete sample must be protected from contamination and _____. - Answers -
Rapid evaporation
The minimum size sample for making strength test specimens is _____. - Answers -1
cubic foot
When sampling from a stationary mixer, the batch must be sampled at _____ or more
regularly spaced intervals during discharge of the middle portion of the batch. - Answers
-2
The composite sample for a paving mixer must represent a minimum of _____ different
portions of the batch of concrete taken from the pile after discharge. - Answers -5
, When sampling from a revolving drum truck mixer, concrete must be sampled at a
minimum of _____ regularly spaced intervals during discharge of the middle portion of
the batch. - Answers -2
Concrete samples from a truck mixer must be obtained before any water or admixtures
are added to the mixer at the job site. True or False? - Answers -False
The composite sample from a truck mixer must be obtained from the _____ portion of
the batch. - Answers -middle
When the concrete contains aggregate larger than that permitted for a particular test
method, the sample of concrete must be _____ _____ before making the test. -
Answers -wet sieved
What must occur before a sample of concrete can be taken from a revolving drum
mixer? (Oral Exam) - Answers -All of the water must be added to the mixer
Describe the different procedures that can be used to collect a sample of concrete from
a stationary or revolving drum mixer. (Oral Exam) - Answers -Repeatedly pass a
receptacle through the entire discharge stream, Completely divert the discharge stream
into a sample container
What are the required steps for collecting a sample of concrete from a stationary or
revolving drum mixer? (Oral Exam) - Answers -Collect two or more portions of concrete,
Take the portions at regularly spaced intervals, Take the portions from the middle of the
batch
Describe the procedure for collecting a sample of pavement concrete deposited on
grade. (Oral Exam) - Answers -Discharge the contents of the paving mixer, Obtain
samples from at least five different portions of the pile
What is the minimum size for a sample when strength test specimens are to be
molded? (Oral Exam) - Answers -1 cubic foot (28 L)
What is the maximum allowable time between obtaining the first and final portions of the
composite sample? (Oral Exam) - Answers -15 min.
How long must the temperature measuring device remain in the freshly mixed concrete?
- Answers -minimum of two minutes, maximum of five minutes
The temperature of the concrete is reported to the nearest ______ °F - Answers -1
degree
A maximum temperature of freshly mixed concrete is specified in ASTM C1064. True or
False? - Answers -False
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