ACI Concrete Field Testing Technician –
Grade 1 Certification Exam for the
2026/2027 cycle, featuring complete exam-
style questions with accurate, up-to-date
answers.
The temperature of concrete may be measured in a wall form.
True or False
True
The sensor of the temperature measuring device shall be
submerged a minimum of _____ in. into the freshly mixed
concrete.
3 in.
Portions of a composite sample shall be thoroughly remixed
bfore beginning tests on the sample. True or False?
True
The temperature measuring device shall have a capacity of
measuring temperature of freshly mixed concrete to +- _____
degrees F [+- _____ C] throughout a range of _____.
1 degree F, 30 degrees F to 120 F
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
A composite sample of concrete is required even if the only
purpose for obtaining the sample is to determine
temperature. True or False?
,False
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.
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?
At least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is
required?
Reporting of temperature
The temperature of concrete is reported to the nearest _____
degrees F
1 degree F
According to ASTM C1064, what is one reason to take the
temperature of concrete?
Verify conformance to a specified requirement for temperature of
concrete
A maximum temperature of freshly mixed concrete is
specified in ASTM C1064. True or False?
False
This method covers sampling from four types of mixtures
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
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 sources of
_____ and _____.
contamination and rapid evaporation
The minimum size sample for making strength test
specimens is _____.
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
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 this 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 samples 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
, The slump test is applicable to plastic concrete with a
maximum size aggregate of _____.
1.5 in.
When the concrete contains aggregate larger than allowed
for the slump test, the large aggregate must be _____.
Removed by wet sieving the sample over 1.5 in. sieve
The mold for making the slump test is in the shape of _____.
The frustum of a cone
The height of the slump mold is _____.
12 in. [300 mm]
The interior surface of the slump mold is allowed to have
minor irregularities. True or False?
False
For use in the slump test, the end or both ends of the
tamping rod must be _____.
Rounded to a hemispherical tip
The sample of concrete for use in making the slump test
must be obained in accordance with ASTM Standard _____.
C172, Standard Practice for Sampling Freshly Mixed Concrete
The slump mold should be in a dry condition before
beginning the test. True or False?
False
The surface on which the slump mold will be placed must be
_____.
Flat, level, moist, nonabsorbent, and free of vibration
The slump mold is filled in _____ layers.
3
Each layer should fill approximately _____ the volume of the
mold.
One-third
The approximate concrete depth (in verticle distance) after
placing the first layer is _____, and the second layer is _____.
2 5/8 in., 6 1/8 in.
What is the specified number of roddings for each layer?
25
Grade 1 Certification Exam for the
2026/2027 cycle, featuring complete exam-
style questions with accurate, up-to-date
answers.
The temperature of concrete may be measured in a wall form.
True or False
True
The sensor of the temperature measuring device shall be
submerged a minimum of _____ in. into the freshly mixed
concrete.
3 in.
Portions of a composite sample shall be thoroughly remixed
bfore beginning tests on the sample. True or False?
True
The temperature measuring device shall have a capacity of
measuring temperature of freshly mixed concrete to +- _____
degrees F [+- _____ C] throughout a range of _____.
1 degree F, 30 degrees F to 120 F
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
A composite sample of concrete is required even if the only
purpose for obtaining the sample is to determine
temperature. True or False?
,False
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.
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?
At least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is
required?
Reporting of temperature
The temperature of concrete is reported to the nearest _____
degrees F
1 degree F
According to ASTM C1064, what is one reason to take the
temperature of concrete?
Verify conformance to a specified requirement for temperature of
concrete
A maximum temperature of freshly mixed concrete is
specified in ASTM C1064. True or False?
False
This method covers sampling from four types of mixtures
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
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 sources of
_____ and _____.
contamination and rapid evaporation
The minimum size sample for making strength test
specimens is _____.
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
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 this 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 samples 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
, The slump test is applicable to plastic concrete with a
maximum size aggregate of _____.
1.5 in.
When the concrete contains aggregate larger than allowed
for the slump test, the large aggregate must be _____.
Removed by wet sieving the sample over 1.5 in. sieve
The mold for making the slump test is in the shape of _____.
The frustum of a cone
The height of the slump mold is _____.
12 in. [300 mm]
The interior surface of the slump mold is allowed to have
minor irregularities. True or False?
False
For use in the slump test, the end or both ends of the
tamping rod must be _____.
Rounded to a hemispherical tip
The sample of concrete for use in making the slump test
must be obained in accordance with ASTM Standard _____.
C172, Standard Practice for Sampling Freshly Mixed Concrete
The slump mold should be in a dry condition before
beginning the test. True or False?
False
The surface on which the slump mold will be placed must be
_____.
Flat, level, moist, nonabsorbent, and free of vibration
The slump mold is filled in _____ layers.
3
Each layer should fill approximately _____ the volume of the
mold.
One-third
The approximate concrete depth (in verticle distance) after
placing the first layer is _____, and the second layer is _____.
2 5/8 in., 6 1/8 in.
What is the specified number of roddings for each layer?
25
