ACI Certification- Concrete Field-Testing Technician
Grade 1 CP-1 (12) 100% Correct Answers | Verified |
Latest 2024 Version
The sensor of the temperature measuring device shall be submerged a minimum of ______ inches into
the freshly mixed concrete. - 3"
The temperature measuring device shall...
The sensor of the temperature measuring device shall be submerged a minimum of ______ inches into
the freshly mixed concrete. - ✔✔3"
The temperature measuring device shall have a capacity of measuring temperature of freshly mixed
concrete to ± ______ °F throughout a range of ____________. - ✔✔1 degree, 30 degrees to 120 degrees
The temperature measuring device shall be calibrated ______ , or whenever there is a question of
______ . - ✔✔Annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? - ✔✔True
The temperature of concrete may be measured in a wall form. True or False? - ✔✔True
What must be done to the sample container prior to sampling the concrete? - ✔✔Dampen with water
What must be done to the concrete surrounding the temperature measuring device after the device is
submerged in the fresh concrete? - ✔✔Close off air voids by gently pressing the concrete around the
device
How long must the temperature measuring device remain in the freshly mixed concrete? - ✔✔minimum
of two minutes, maximum of five minutes
The temperature of the concrete is reported to the nearest ______ °F - ✔✔1 degree
A maximum temperature of freshly mixed concrete is specified in ASTM C1064. True or False? - ✔✔False
,ASTM C172 - ✔✔Standard Practice for Sampling Freshly Mixed Concrete
Sampling by this method is required when tests are to be made to determine _____ with specification
requirements. - ✔✔Compliance
This method covers sampling from four types of mixers, which are _____ , _____ , _____ , and _____ . -
✔✔Stationary mixers, paving mixers, revolving drum mixers and open top mixers
The maximum allowable time between obtaining the first and final portions of a composite sample is
_____ minutes. - ✔✔15
Portions of a composite sample shall be thoroughly remixed before beginning tests on the sample. True
or False? - ✔✔True
The maximum elapsed time allowed between obtaining the final portion of the composite sample and
beginning the tests for slump, temperature, and air content is _____ minutes. - ✔✔5
The molding of strength test specimens shall begin within _____ minutes after fabricating the composite
sample. - ✔✔15
The concrete sample must be protected from contamination and _____. - ✔✔Rapid evaporation
The minimum size sample for making strength test specimens is _____. - ✔✔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. - ✔✔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. - ✔✔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. - ✔✔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? - ✔✔False
The composite sample from a truck mixer must be obtained from the _____ portion of the batch. -
✔✔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. - ✔✔wet sieved
What must occur before a sample of concrete can be taken from a revolving drum mixer? (Oral Exam) -
✔✔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) - ✔✔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) - ✔✔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) -
✔✔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) -
✔✔1 cubic foot (28 L)
What is the maximum allowable time between obtaining the first and final portions of the composite
sample? (Oral Exam) - ✔✔15 min.
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