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ACI Concrete Field Testing Technician - Grade I Exam Questions & Answers
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ACI Concrete Field Testing Technician -Grade I Exam Questions & Answers
The end of the temperature sensing portion of the temperature measuring
device is submerged a minimum of __mm [__in.] into the freshly mixed
concrete. - -77mm /3in.
-The temperature measuring device shall be capable of accurately
measuring the temperature of freshly mixed concrete to +- __C [+__F]
throught a range of __. - -0.5 C / +-1F / 0-50 Decrees C
-The temp. measuring device shall be verified __, or whenever there is a
question of __. - -Annually / accuracy
-The temp of concrete may be measured in a wheelbarrow? T/F - -True
-The temp. of concrete may be measured in a wall form. T/F - -True
-A composite sample of concrete is required even if the only purpose for
obtaining the sample is to determine temp. T/F - -False
-What must be done to the sample container prior to sampling the concrete
- -It must be dampened with water
-What must be done to the concrete surrounding the temp measuring device
after the device is submerged in the fresh concrete? - -Gently press the
concrete at the surface around the measuring device.
-How long must the temperature measuring device remain in the freshly
mixed concrete? - -At least 2 min., no longer than 5 min.
-After the temperature of the concrete is read, what is then required? - -
Reporting of temp.
-The temp. of concrete is reported to the nearest __. - -1 degree F
-According to ASTM C1064, what is one reason to take the temperature of
concrete? - -to verify conformance to a specific requirement.
-A max. temp. of freshly mixed concrete is specified in ASTM C1064. T/F - -
False
-The sample of concrete used for temperature determination must be
rodded 25 times. - -False
, -Sampling by this method covers procedures or obtaining representative
samples, on which test are to be performed to determined __ with quality
requirements of the specifications under which the concrete is furnished. - -
Compliance
-This method covers sampling from four types of mixers, which are __, __, __,
and __. - -Stationary mixers / Paving mixers / revolving drum mixers / open
top mixers
-The elapsed time between obtaining the first and final portions of a
composite sample shall not exceed __ min. - -15 min.
-Portions of a composite sample shall be thoroughly mixed before beginning
test on the sample. T/F - -True
-Start tests for slump, temp, and air content within __ min. after obtaining
the final portion of the composite sample. - -5 min.
-start molding specimens fr strength tests within __ after fabrication the
composite sample. - -15 min.
-The concrete sample must be protected from contamination and __. - -
Rapid evaporation
-The maximum size sample for making strength test specimens is __ ft
cubed - -1 foot cubed.
-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
-When sampling from a PAVING mixer, obtain samples from at least __
different portions of the pile and combine them into one composite sample
for test purposes - -5
-When sampling from a REVOLVING DRUM TRUCK mixer, sample the
concrete by collecting __ or more portions taken at regularly spaced intervals
during discharge of the middle portion of the batch. - -2
-Concrete samples from a truck mixer will be obtained before any water or
admixtures are added to the mixer at the job site. T/F - -False
-The composite sample from a truck mixer must be obtained from the __
portion of the batch. - -Middle.
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