ACI CONCRETE FIELD TESTING TECHNICIAN- GRADE I EXAM QUESTIONS ANSWERED CORRECTLY
LATEST UPDATE 2026
The temperature of concrete may be measured in a wall form. True or False - Answers True
The sensor of the temperature measuring device shall be submerged a minimum of _____ in. into the
freshly mixed concrete. - Answers 3 in.
Portions of a composite sample shall be thoroughly remixed bfore beginning tests on the sample.
True or False? - Answers True
The temperature measuring device shall have a capacity of measuring temperature of freshly mixed
concrete to +- _____ degrees F [+- _____ C] throughout a range of _____. - Answers 1 degree F, 30
degrees F to 120 F
The temperature measuring device shall be calibrated _____, or whenever there is a question of
_____. - Answers Annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? - Answers True
A composite sample of concrete is required even if the only purpose for obtaining the sample is to
determine temperature. True or False? - Answers False
What must be done to the sample container prior to sampling the concrete? - Answers Dampen with
water
What must be done to the concrete surrounding the temperature measuring device after the device is
submerged in the fresh concrete. - Answers 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? - Answers At
least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required? - Answers Reporting of temperature
The temperature of concrete is reported to the nearest _____ degrees F - Answers 1 degree F
According to ASTM C1064, what is one reason to take the temperature of concrete? - Answers 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? -
Answers False
This method covers sampling from four types of mixtures which are _____, _____, _____, and _____.
- Answers 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. - Answers 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. - Answers 5
The molding of strength test specimens shall begin within _____ minutes after fabricating the
composite sample. - Answers 15
The concrete sample must be protected from sources of _____ and _____. - Answers contamination
and rapid evaporation
The minimum size sample for making strength test specimens is _____. - Answers 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 - Answers 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. - Answers 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. - Answers 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? - Answers False
The composite samples from a truck mixer must be obtained from the _____ portion of the batch. -
Answers 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. - Answers Wet sieved
The slump test is applicable to plastic concrete with a maximum size aggregate of _____. - Answers
1.5 in.
When the concrete contains aggregate larger than allowed for the slump test, the large aggregate
must be _____. - Answers Removed by wet sieving the sample over 1.5 in. sieve
The mold for making the slump test is in the shape of _____. - Answers The frustum of a cone
, The height of the slump mold is _____. - Answers 12 in. [300 mm]
The interior surface of the slump mold is allowed to have minor irregularities. True or False? -
Answers False
For use in the slump test, the end or both ends of the tamping rod must be _____. - Answers Rounded
to a hemispherical tip
The sample of concrete for use in making the slump test must be obained in accordance with ASTM
Standard _____. - Answers C172, Standard Practice for Sampling Freshly Mixed Concrete
The slump mold should be in a dry condition before beginning the test. True or False? - Answers False
The surface on which the slump mold will be placed must be _____. - Answers Flat, level, moist,
nonabsorbent, and free of vibration
The slump mold is filled in _____ layers. - Answers 3
Each layer should fill approximately _____ the volume of the mold. - Answers One-third
The approximate concrete depth (in verticle distance) after placing the first layer is _____, and the
second layer is _____. - Answers 2 5/8 in., 6 1/8 in.
What is the specified number of roddings for each layer? - Answers 25
How deep should the tamping rod penetrate into each layer? - Answers Rod each layer throughout its
depth; on the second and final layers, the rod should penetrate into the previous layer approximately
1 in.
When rodding the bottom layer, the tamping rod must be _____ to uniformly distribute the strokes. -
Answers Slightly inclined
What must be done if the concrete drops below the top of the slump mold while the top layer is being
rodded? - Answers Add additional concrete to keep an excess of concrete above the top of the mold
at all times
Prior to lifting the mold, concrete must be removed from _____. - Answers The area surrounding the
base of the mold
After the final rodding, the sides of the slump mold should should be tapped lightly with the tamping
rod. True or False? - Answers False
When raising the slump mold, it should not be rotated or twisted, True or False? - Answers True
How much time is allowed for lifting the slump mold? - Answers 5 +- 2 seconds
The measurement for slump is made from the top of the mold to what point of the concrete
specimen? - Answers The displaced original center of the top surface of the specimen
The slump of the concrete is measured and reported to the nearest _____. - Answers 1/4 in.
How much time is allowed to conduct the slump test from beginning to completion? - Answers 2 1/2
minutes
The diameter of the tamping rod used in the Slump test is _____. - Answers 5/8 in.
What is the required shape of the tamping end of the rod? - Answers Rounded to a hemispherical tip
A plastic container can be used for the measure in unit weight. True or False? - Answers False,
measure must be steel or another suitable metal
What is the required minimum frequency of the vibrator used in Unit Weight test method? - Answers
9000 vibrations per minute
What is the minimum thickness of a metal strike-off plate? - Answers 1/4 in.
What is the minimum thickness for a glass or acrylic strike-off plate? - Answers 1/2 in.
What is the specified weight of the mallet used on measures that are 0.5 ft^3 or smaller? - Answers
1.25 lbs.
What method of consolidation must be used when the slump is greater than 3 in.? - Answers Rodding
What method of consolidation must be used when the slump is less than 1 in.? - Answers Vibration
If rodding is the method of consolidation being used, the measure must be filled in how many layers?
- Answers 3
For consolidating the unit weight sample into the bowel, what is the required number of strokes of
the tamping rod for consolidation of each layer? - Answers 25
When rodding the middle and the top layers, the tamping rod should penetrate into the layer below
approximately _____. - Answers 1 in.
If vibration is the method of consolidation, the measure must be filled in _____ approximately equal
layers. - Answers 2
If, after consolidation of the final layer for unit weight, the concrete level is 1/2 in. above the top of
the measure, what should be done? - Answers Remove a representative portion of the excess
concrete with a trowel or scoop
LATEST UPDATE 2026
The temperature of concrete may be measured in a wall form. True or False - Answers True
The sensor of the temperature measuring device shall be submerged a minimum of _____ in. into the
freshly mixed concrete. - Answers 3 in.
Portions of a composite sample shall be thoroughly remixed bfore beginning tests on the sample.
True or False? - Answers True
The temperature measuring device shall have a capacity of measuring temperature of freshly mixed
concrete to +- _____ degrees F [+- _____ C] throughout a range of _____. - Answers 1 degree F, 30
degrees F to 120 F
The temperature measuring device shall be calibrated _____, or whenever there is a question of
_____. - Answers Annually, accuracy
The temperature of concrete may be measured in a wheelbarrow. True or False? - Answers True
A composite sample of concrete is required even if the only purpose for obtaining the sample is to
determine temperature. True or False? - Answers False
What must be done to the sample container prior to sampling the concrete? - Answers Dampen with
water
What must be done to the concrete surrounding the temperature measuring device after the device is
submerged in the fresh concrete. - Answers 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? - Answers At
least 2 minutes but not more than 5 minutes
After the temperature of the concrete is read, what is required? - Answers Reporting of temperature
The temperature of concrete is reported to the nearest _____ degrees F - Answers 1 degree F
According to ASTM C1064, what is one reason to take the temperature of concrete? - Answers 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? -
Answers False
This method covers sampling from four types of mixtures which are _____, _____, _____, and _____.
- Answers 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. - Answers 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. - Answers 5
The molding of strength test specimens shall begin within _____ minutes after fabricating the
composite sample. - Answers 15
The concrete sample must be protected from sources of _____ and _____. - Answers contamination
and rapid evaporation
The minimum size sample for making strength test specimens is _____. - Answers 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 - Answers 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. - Answers 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. - Answers 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? - Answers False
The composite samples from a truck mixer must be obtained from the _____ portion of the batch. -
Answers 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. - Answers Wet sieved
The slump test is applicable to plastic concrete with a maximum size aggregate of _____. - Answers
1.5 in.
When the concrete contains aggregate larger than allowed for the slump test, the large aggregate
must be _____. - Answers Removed by wet sieving the sample over 1.5 in. sieve
The mold for making the slump test is in the shape of _____. - Answers The frustum of a cone
, The height of the slump mold is _____. - Answers 12 in. [300 mm]
The interior surface of the slump mold is allowed to have minor irregularities. True or False? -
Answers False
For use in the slump test, the end or both ends of the tamping rod must be _____. - Answers Rounded
to a hemispherical tip
The sample of concrete for use in making the slump test must be obained in accordance with ASTM
Standard _____. - Answers C172, Standard Practice for Sampling Freshly Mixed Concrete
The slump mold should be in a dry condition before beginning the test. True or False? - Answers False
The surface on which the slump mold will be placed must be _____. - Answers Flat, level, moist,
nonabsorbent, and free of vibration
The slump mold is filled in _____ layers. - Answers 3
Each layer should fill approximately _____ the volume of the mold. - Answers One-third
The approximate concrete depth (in verticle distance) after placing the first layer is _____, and the
second layer is _____. - Answers 2 5/8 in., 6 1/8 in.
What is the specified number of roddings for each layer? - Answers 25
How deep should the tamping rod penetrate into each layer? - Answers Rod each layer throughout its
depth; on the second and final layers, the rod should penetrate into the previous layer approximately
1 in.
When rodding the bottom layer, the tamping rod must be _____ to uniformly distribute the strokes. -
Answers Slightly inclined
What must be done if the concrete drops below the top of the slump mold while the top layer is being
rodded? - Answers Add additional concrete to keep an excess of concrete above the top of the mold
at all times
Prior to lifting the mold, concrete must be removed from _____. - Answers The area surrounding the
base of the mold
After the final rodding, the sides of the slump mold should should be tapped lightly with the tamping
rod. True or False? - Answers False
When raising the slump mold, it should not be rotated or twisted, True or False? - Answers True
How much time is allowed for lifting the slump mold? - Answers 5 +- 2 seconds
The measurement for slump is made from the top of the mold to what point of the concrete
specimen? - Answers The displaced original center of the top surface of the specimen
The slump of the concrete is measured and reported to the nearest _____. - Answers 1/4 in.
How much time is allowed to conduct the slump test from beginning to completion? - Answers 2 1/2
minutes
The diameter of the tamping rod used in the Slump test is _____. - Answers 5/8 in.
What is the required shape of the tamping end of the rod? - Answers Rounded to a hemispherical tip
A plastic container can be used for the measure in unit weight. True or False? - Answers False,
measure must be steel or another suitable metal
What is the required minimum frequency of the vibrator used in Unit Weight test method? - Answers
9000 vibrations per minute
What is the minimum thickness of a metal strike-off plate? - Answers 1/4 in.
What is the minimum thickness for a glass or acrylic strike-off plate? - Answers 1/2 in.
What is the specified weight of the mallet used on measures that are 0.5 ft^3 or smaller? - Answers
1.25 lbs.
What method of consolidation must be used when the slump is greater than 3 in.? - Answers Rodding
What method of consolidation must be used when the slump is less than 1 in.? - Answers Vibration
If rodding is the method of consolidation being used, the measure must be filled in how many layers?
- Answers 3
For consolidating the unit weight sample into the bowel, what is the required number of strokes of
the tamping rod for consolidation of each layer? - Answers 25
When rodding the middle and the top layers, the tamping rod should penetrate into the layer below
approximately _____. - Answers 1 in.
If vibration is the method of consolidation, the measure must be filled in _____ approximately equal
layers. - Answers 2
If, after consolidation of the final layer for unit weight, the concrete level is 1/2 in. above the top of
the measure, what should be done? - Answers Remove a representative portion of the excess
concrete with a trowel or scoop
