ACI Concrete Field Testing Technician- Grade I
Exam|Complete with A+ Graded 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
Exam|Complete with A+ Graded 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
