2025 ACI CONCRETE FIELD TESTING
TECHNICIAN- GRADE I EXAM
QUESTIONS AND ANSWERS
The sensor of the temperature measuring device shall be submerged a minimum of in.
[ mm] into the freshly mixed concrete. CORRECT ANS✔✔ 3 in. [75 mm]
The temperature measuring device shall have a capacity of measuring temperature of
freshly mixed concrete to +- ________________degrees F [+- C] throughout
a range of . CORRECT ANS✔✔ 1
degree F [0.5 C], 30 degrees F to 120 F [0 C to 50 C]
The temperature measuring device shall be calibrated , or whenever there is a
question of CORRECT ANS✔✔ Annually,
accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? CORRECT
ANS✔✔ True
The temperature of concrete may be measured in a wall form. True of False CORRECT
ANS✔✔ True
A composite sample of concrete is required even if the only purpose for obtaining the sample
is to determine temperature. True of False? CORRECT ANS✔✔ False
What must be done to the sample container prior to sampling the concrete? CORRECT
ANS✔✔ Dampen (with water)
,What must be done to the concrete surrounding the temperature measuring device after the
device is submerged in the fresh concrete. CORRECT ANS✔✔ Gently press the concrete
around the temperature measuring device at the surface of the concrete
How long must the temperature measuring device remain in the freshly mixed concrete?
CORRECT ANS✔✔ At least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required? CORRECT ANS✔✔ Reporting
of temperature
The temperature of concrete is reported to the nearest degrees F [______C] CORRECT
ANS✔✔ 1
degree F [0.5 C]
According to ASTM C1064, what is one reason to take the temperature of concrete?
CORRECT ANS✔✔ Verify conformance to a specified requirement for temperature of
concrete
A maximum temperature of freshly mixed concrete is specified in ASTM C1064. True of False?
CORRECT ANS✔✔ False
The sample of concrete used for temperature determination must be rodded 25 times. True
or False? CORRECT ANS✔✔ False
Sampling by this method is required when tests are to be made to determine with
specification requirements. CORRECT ANS✔✔ Compliance
This method covers sampling from four types of mixtures which are , , , and
. CORRECT ANS✔✔ 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. CORRECT ANS✔✔ 15
Portions of a composite sample shall be thoroughly remixed bfore beginning tests on the
sample. True of False? CORRECT ANS✔✔ 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.
CORRECT ANS✔✔ 5
The molding of strength test specimens shall begin within minutes after fabricating the
composite sample. CORRECT ANS✔✔ 15
The concrete sample must be protected from contamination and-----------answer Rapid
evaporation
The minimum size sample for making strength test specimens is-----------CORRECT ANS✔✔28
L (1ft^3)
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 CORRECT
ANS✔✔ 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. CORRECT
ANS✔✔ 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 this
batch. CORRECT ANS✔✔ 2
TECHNICIAN- GRADE I EXAM
QUESTIONS AND ANSWERS
The sensor of the temperature measuring device shall be submerged a minimum of in.
[ mm] into the freshly mixed concrete. CORRECT ANS✔✔ 3 in. [75 mm]
The temperature measuring device shall have a capacity of measuring temperature of
freshly mixed concrete to +- ________________degrees F [+- C] throughout
a range of . CORRECT ANS✔✔ 1
degree F [0.5 C], 30 degrees F to 120 F [0 C to 50 C]
The temperature measuring device shall be calibrated , or whenever there is a
question of CORRECT ANS✔✔ Annually,
accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? CORRECT
ANS✔✔ True
The temperature of concrete may be measured in a wall form. True of False CORRECT
ANS✔✔ True
A composite sample of concrete is required even if the only purpose for obtaining the sample
is to determine temperature. True of False? CORRECT ANS✔✔ False
What must be done to the sample container prior to sampling the concrete? CORRECT
ANS✔✔ Dampen (with water)
,What must be done to the concrete surrounding the temperature measuring device after the
device is submerged in the fresh concrete. CORRECT ANS✔✔ Gently press the concrete
around the temperature measuring device at the surface of the concrete
How long must the temperature measuring device remain in the freshly mixed concrete?
CORRECT ANS✔✔ At least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required? CORRECT ANS✔✔ Reporting
of temperature
The temperature of concrete is reported to the nearest degrees F [______C] CORRECT
ANS✔✔ 1
degree F [0.5 C]
According to ASTM C1064, what is one reason to take the temperature of concrete?
CORRECT ANS✔✔ Verify conformance to a specified requirement for temperature of
concrete
A maximum temperature of freshly mixed concrete is specified in ASTM C1064. True of False?
CORRECT ANS✔✔ False
The sample of concrete used for temperature determination must be rodded 25 times. True
or False? CORRECT ANS✔✔ False
Sampling by this method is required when tests are to be made to determine with
specification requirements. CORRECT ANS✔✔ Compliance
This method covers sampling from four types of mixtures which are , , , and
. CORRECT ANS✔✔ 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. CORRECT ANS✔✔ 15
Portions of a composite sample shall be thoroughly remixed bfore beginning tests on the
sample. True of False? CORRECT ANS✔✔ 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.
CORRECT ANS✔✔ 5
The molding of strength test specimens shall begin within minutes after fabricating the
composite sample. CORRECT ANS✔✔ 15
The concrete sample must be protected from contamination and-----------answer Rapid
evaporation
The minimum size sample for making strength test specimens is-----------CORRECT ANS✔✔28
L (1ft^3)
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 CORRECT
ANS✔✔ 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. CORRECT
ANS✔✔ 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 this
batch. CORRECT ANS✔✔ 2
