ACI Concrete CERTIFICATION EXAM PREP
2025/2026 ACCURATE QUESTIONS AND
VERIFIED CORRECT SOLUTIONS WITH
RATIONALES || 100% GUARANTEED PASS
<LATEST VERSION>
1. ASTM C1064 is for what testing? - ANSWER ✔ Standard Test Method For
Temperature of Freshly Mixed Hydraulic-Cement Concre
2. The sensor of the temperature measuring device shall be submerged a
minimum of ______ inches into the freshly mixed concrete. - ANSWER ✔
3" (in depth )
3. The temperature measuring device shall have a capacity of measuring
temperature of freshly mixed concrete to ± ______ °F throughout a range of
____________. - ANSWER ✔ 1 degree, 30 degrees to 120 degrees
4. The temperature measuring device shall be calibrated ______ , or whenever
there is a question of ______ . - ANSWER ✔ Annually, accuracy
5. The temperature of concrete may be measured in a wheelbarrow. True or
False? - ANSWER ✔ True
6. The temperature of concrete may be measured in a wall form. True or False?
- ANSWER ✔ True
7. What must be done to the sample container prior to sampling the concrete? -
ANSWER ✔ Dampen with water
,8. What must be done to the concrete surrounding the temperature measuring
device after the device is submerged in the fresh concrete? - ANSWER ✔
Close off air voids by gently pressing the concrete around the device
9. How long must the temperature measuring device remain in the freshly
mixed concrete? - ANSWER ✔ minimum of two minutes, maximum of five
minutes
10.The temperature of the concrete is reported to the nearest ______ °F -
ANSWER ✔ 1 degree
11.A maximum temperature of freshly mixed concrete is specified in ASTM
C1064. True or False? - ANSWER ✔ False, The maximum temperature will
be identified in the job specifications.
12.The surface on which the slump mold will be placed must be _____. -
ANSWER ✔ Flat, level, moist, nonabsorbent, and free of vibration
13.When Rodding the concrete in a 6"x12" Cylinder, each layer should fill
approximately _____ the volume of the mold. - ANSWER ✔ One-Third
14.The approximate concrete depth (in vertical distance) after placing the first
layer is _____, and the second layer is _____. - ANSWER ✔ 2⅝ in. [70
mm], 6⅛ in. [160 mm]
15.How deep should the tamping rod penetrate into each layer when rodding
concrete test samples? - ANSWER ✔ Rod each layer throughout its depth;
on the second and final layers, the rod should penetrate into the previous
layer approximately 1 in. [25 mm]
16.When rodding the bottom layer of the slump cone, the tamping rod must be
_____ to uniformly distribute the strokes. - ANSWER ✔ Slightly Inclined
17.What must be done if the concrete drops below the top of the slump mold
while the top layer is being rodded? - ANSWER ✔ Add additional concrete
to keep an excess of concrete above the top of the mold at all times
,18.Prior to lifting the slump cone, concrete must be removed from _______. -
ANSWER ✔ The area surrounding the base of the mold
19.After the final rodding, the sides of the slump mold should be tapped lightly
with the tamping rod - ANSWER ✔ False
20.When raising the slump mold, it should not be rotated or twisted. -
ANSWER ✔ True
21.How much time is allowed for lifting the slump mold? - ANSWER ✔ 5 ± 2
seconds
22.The measurement for slump is made from the top of the mold to what point
of the concrete specimen? - ANSWER ✔ The displaced original center of
the top surface of the specimen
23.The slump of the concrete is measured and reported to the nearest _____. -
ANSWER ✔ ¼ in. [5 mm]
24.How much time is allowed to conduct the slump test from beginning to
completion? - ANSWER ✔ 2½ minutes
25.ASTM C138 identifies what test method? - ANSWER ✔ Standard Test
Method for Density (Unit Weight),
Yield, and Air Content (Gravimetric) of Concrete
26.The diameter of the tamping rod used fabricating 6"x12" test cylinders is
_____ . - ANSWER ✔ ⅝ in. [16 mm]
27.What is the required minimum frequency of the internal vibrator ? -
ANSWER ✔ 7000 vibrations per minute
28.True or False: The method of determining air content of concrete containing
lightweight aggregate is the pressure method. - ANSWER ✔ False
29.True or False: When making a test cylinder from concrete being used in
construction, the field technician must also measure the slump of the
concrete. - ANSWER ✔ True
, 30.While the technician is checking the slump of the concrete, there is a
decided falling away or shearing off of concrete from one side of the sample.
What should the technician do? - ANSWER ✔ Disregard the test and retest
on another portion of the sample.
31.Preparation of specimens for transport includes: - ANSWER ✔
Determination that at least 8 h has elapsed since final set.
32.If the aggregate correction factor for a given source of fine and coarse
aggregate is found to be 0.2% in a pressure air meter, and an air content
value of 5.0% is read on the gage of the same air meter containing concrete
with the same aggregate, what is the correct air content? - ANSWER ✔
4.8%
33.Strength test specimens transported from the field to the testing laboratory
must be: - ANSWER ✔ Protected from jarring
Protected from moisture loss
Protected from freezing
34.Tests for slump and air content must be started within ( ) after obtaining the
final portion of the composite sample. - ANSWER ✔ 5 min
35.The minimum size for samples to be used for strength tests is: - ANSWER
✔ 1 ft^3 [28 L]
36.For normal strength concretes, what temperature range must be maintained
for test cylinders during initial curing? - ANSWER ✔ 60 to 80 F [16 to 27
C]
37.True or False: When the concrete contains large aggregate, the testing
technician should wet screen the sample before making density (unit weight)
tests for use in yield computations. - ANSWER ✔ False
38.When determining the temperature of fresh concrete, what is the minimum
amount of concrete cover in all directions around the sensor of the
tempreture measuring device? - ANSWER ✔ 3 in [75 mm]
2025/2026 ACCURATE QUESTIONS AND
VERIFIED CORRECT SOLUTIONS WITH
RATIONALES || 100% GUARANTEED PASS
<LATEST VERSION>
1. ASTM C1064 is for what testing? - ANSWER ✔ Standard Test Method For
Temperature of Freshly Mixed Hydraulic-Cement Concre
2. The sensor of the temperature measuring device shall be submerged a
minimum of ______ inches into the freshly mixed concrete. - ANSWER ✔
3" (in depth )
3. The temperature measuring device shall have a capacity of measuring
temperature of freshly mixed concrete to ± ______ °F throughout a range of
____________. - ANSWER ✔ 1 degree, 30 degrees to 120 degrees
4. The temperature measuring device shall be calibrated ______ , or whenever
there is a question of ______ . - ANSWER ✔ Annually, accuracy
5. The temperature of concrete may be measured in a wheelbarrow. True or
False? - ANSWER ✔ True
6. The temperature of concrete may be measured in a wall form. True or False?
- ANSWER ✔ True
7. What must be done to the sample container prior to sampling the concrete? -
ANSWER ✔ Dampen with water
,8. What must be done to the concrete surrounding the temperature measuring
device after the device is submerged in the fresh concrete? - ANSWER ✔
Close off air voids by gently pressing the concrete around the device
9. How long must the temperature measuring device remain in the freshly
mixed concrete? - ANSWER ✔ minimum of two minutes, maximum of five
minutes
10.The temperature of the concrete is reported to the nearest ______ °F -
ANSWER ✔ 1 degree
11.A maximum temperature of freshly mixed concrete is specified in ASTM
C1064. True or False? - ANSWER ✔ False, The maximum temperature will
be identified in the job specifications.
12.The surface on which the slump mold will be placed must be _____. -
ANSWER ✔ Flat, level, moist, nonabsorbent, and free of vibration
13.When Rodding the concrete in a 6"x12" Cylinder, each layer should fill
approximately _____ the volume of the mold. - ANSWER ✔ One-Third
14.The approximate concrete depth (in vertical distance) after placing the first
layer is _____, and the second layer is _____. - ANSWER ✔ 2⅝ in. [70
mm], 6⅛ in. [160 mm]
15.How deep should the tamping rod penetrate into each layer when rodding
concrete test samples? - ANSWER ✔ Rod each layer throughout its depth;
on the second and final layers, the rod should penetrate into the previous
layer approximately 1 in. [25 mm]
16.When rodding the bottom layer of the slump cone, the tamping rod must be
_____ to uniformly distribute the strokes. - ANSWER ✔ Slightly Inclined
17.What must be done if the concrete drops below the top of the slump mold
while the top layer is being rodded? - ANSWER ✔ Add additional concrete
to keep an excess of concrete above the top of the mold at all times
,18.Prior to lifting the slump cone, concrete must be removed from _______. -
ANSWER ✔ The area surrounding the base of the mold
19.After the final rodding, the sides of the slump mold should be tapped lightly
with the tamping rod - ANSWER ✔ False
20.When raising the slump mold, it should not be rotated or twisted. -
ANSWER ✔ True
21.How much time is allowed for lifting the slump mold? - ANSWER ✔ 5 ± 2
seconds
22.The measurement for slump is made from the top of the mold to what point
of the concrete specimen? - ANSWER ✔ The displaced original center of
the top surface of the specimen
23.The slump of the concrete is measured and reported to the nearest _____. -
ANSWER ✔ ¼ in. [5 mm]
24.How much time is allowed to conduct the slump test from beginning to
completion? - ANSWER ✔ 2½ minutes
25.ASTM C138 identifies what test method? - ANSWER ✔ Standard Test
Method for Density (Unit Weight),
Yield, and Air Content (Gravimetric) of Concrete
26.The diameter of the tamping rod used fabricating 6"x12" test cylinders is
_____ . - ANSWER ✔ ⅝ in. [16 mm]
27.What is the required minimum frequency of the internal vibrator ? -
ANSWER ✔ 7000 vibrations per minute
28.True or False: The method of determining air content of concrete containing
lightweight aggregate is the pressure method. - ANSWER ✔ False
29.True or False: When making a test cylinder from concrete being used in
construction, the field technician must also measure the slump of the
concrete. - ANSWER ✔ True
, 30.While the technician is checking the slump of the concrete, there is a
decided falling away or shearing off of concrete from one side of the sample.
What should the technician do? - ANSWER ✔ Disregard the test and retest
on another portion of the sample.
31.Preparation of specimens for transport includes: - ANSWER ✔
Determination that at least 8 h has elapsed since final set.
32.If the aggregate correction factor for a given source of fine and coarse
aggregate is found to be 0.2% in a pressure air meter, and an air content
value of 5.0% is read on the gage of the same air meter containing concrete
with the same aggregate, what is the correct air content? - ANSWER ✔
4.8%
33.Strength test specimens transported from the field to the testing laboratory
must be: - ANSWER ✔ Protected from jarring
Protected from moisture loss
Protected from freezing
34.Tests for slump and air content must be started within ( ) after obtaining the
final portion of the composite sample. - ANSWER ✔ 5 min
35.The minimum size for samples to be used for strength tests is: - ANSWER
✔ 1 ft^3 [28 L]
36.For normal strength concretes, what temperature range must be maintained
for test cylinders during initial curing? - ANSWER ✔ 60 to 80 F [16 to 27
C]
37.True or False: When the concrete contains large aggregate, the testing
technician should wet screen the sample before making density (unit weight)
tests for use in yield computations. - ANSWER ✔ False
38.When determining the temperature of fresh concrete, what is the minimum
amount of concrete cover in all directions around the sensor of the
tempreture measuring device? - ANSWER ✔ 3 in [75 mm]
