ACI Concrete Field Testing Technician -
Grade I
The end of the temperature sensing portion of the temperature measuring device is
submerged a minimum of __mm [__in.] into the freshly mixed concrete. - ANS77mm /3in.
The temperature measuring device shall be capable of accurately measuring the
temperature of freshly mixed concrete to +- __C [+__F] throught a range of __. - ANS0.5 C /
+-1F / 0-50 Decrees C
The temp. measuring device shall be verified __, or whenever there is a question of __. -
ANSAnnually / accuracy
The temp of concrete may be measured in a wheelbarrow? T/F - ANSTrue
The temp. of concrete may be measured in a wall form. T/F - ANSTrue
A composite sample of concrete is required even if the only purpose for obtaining the sample
is to determine temp. T/F - ANSFalse
What must be done to the sample container prior to sampling the concrete - ANSIt 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? - ANSGently press the concrete at the surface around
the measuring device.
How long must the temperature measuring device remain in the freshly mixed concrete? -
ANSAt least 2 min., no longer than 5 min.
After the temperature of the concrete is read, what is then required? - ANSReporting of
temp.
The temp. of concrete is reported to the nearest __. - ANS1 degree F
According to ASTM C1064, what is one reason to take the temperature of concrete? - ANSto
verify conformance to a specific requirement.
A max. temp. of freshly mixed concrete is specified in ASTM C1064. T/F - ANSFalse
The sample of concrete used for temperature determination must be rodded 25 times. -
ANSFalse
, 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. - ANSCompliance
This method covers sampling from four types of mixers, which are __, __, __, and __. -
ANSStationary 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. - ANS15 min.
Portions of a composite sample shall be thoroughly mixed before beginning test on the
sample. T/F - ANSTrue
Start tests for slump, temp, and air content within __ min. after obtaining the final portion of
the composite sample. - ANS5 min.
start molding specimens fr strength tests within __ after fabrication the composite sample. -
ANS15 min.
The concrete sample must be protected from contamination and __. - ANSRapid
evaporation
The maximum size sample for making strength test specimens is __ ft cubed - ANS1 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. - ANS2
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 - ANS5
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. - ANS2
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 - ANSFalse
The composite sample from a truck mixer must be obtained from the __ portion of the batch.
- ANSMiddle.
When the concrete contains aggregate larger than that permitted for a particular test
method, the sample of concrete must be __ __ before making the test. - ANSWet-seived
The slump test is applicable to plastic concrete with a maximum size aggregate of __. -
ANS1.5 "
The mold for making the slump is in the shape of __. - ANSFrustum
Grade I
The end of the temperature sensing portion of the temperature measuring device is
submerged a minimum of __mm [__in.] into the freshly mixed concrete. - ANS77mm /3in.
The temperature measuring device shall be capable of accurately measuring the
temperature of freshly mixed concrete to +- __C [+__F] throught a range of __. - ANS0.5 C /
+-1F / 0-50 Decrees C
The temp. measuring device shall be verified __, or whenever there is a question of __. -
ANSAnnually / accuracy
The temp of concrete may be measured in a wheelbarrow? T/F - ANSTrue
The temp. of concrete may be measured in a wall form. T/F - ANSTrue
A composite sample of concrete is required even if the only purpose for obtaining the sample
is to determine temp. T/F - ANSFalse
What must be done to the sample container prior to sampling the concrete - ANSIt 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? - ANSGently press the concrete at the surface around
the measuring device.
How long must the temperature measuring device remain in the freshly mixed concrete? -
ANSAt least 2 min., no longer than 5 min.
After the temperature of the concrete is read, what is then required? - ANSReporting of
temp.
The temp. of concrete is reported to the nearest __. - ANS1 degree F
According to ASTM C1064, what is one reason to take the temperature of concrete? - ANSto
verify conformance to a specific requirement.
A max. temp. of freshly mixed concrete is specified in ASTM C1064. T/F - ANSFalse
The sample of concrete used for temperature determination must be rodded 25 times. -
ANSFalse
, 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. - ANSCompliance
This method covers sampling from four types of mixers, which are __, __, __, and __. -
ANSStationary 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. - ANS15 min.
Portions of a composite sample shall be thoroughly mixed before beginning test on the
sample. T/F - ANSTrue
Start tests for slump, temp, and air content within __ min. after obtaining the final portion of
the composite sample. - ANS5 min.
start molding specimens fr strength tests within __ after fabrication the composite sample. -
ANS15 min.
The concrete sample must be protected from contamination and __. - ANSRapid
evaporation
The maximum size sample for making strength test specimens is __ ft cubed - ANS1 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. - ANS2
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 - ANS5
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. - ANS2
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 - ANSFalse
The composite sample from a truck mixer must be obtained from the __ portion of the batch.
- ANSMiddle.
When the concrete contains aggregate larger than that permitted for a particular test
method, the sample of concrete must be __ __ before making the test. - ANSWet-seived
The slump test is applicable to plastic concrete with a maximum size aggregate of __. -
ANS1.5 "
The mold for making the slump is in the shape of __. - ANSFrustum
