ACI Concrete Field Testing Technician
Grade I Practice Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
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1. What is the primary purpose of performing a slump test on fresh
concrete?
A. To measure compressive strength
B. To determine air content
C. To assess workability
D. To evaluate durability
Rationale: The slump test is used to measure the consistency or
workability of fresh concrete, not its strength or air content.
,2. When performing a slump test, what should be done after filling the
slump cone in three layers?
A. Tap lightly once
B. Rod each layer 25 times with a tamping rod
C. Fill and immediately lift the cone
D. Apply water to the surface
Rationale: Each of the three layers must be rodded 25 times to
ensure uniform compaction.
3. During a slump test, if concrete has a slump of 0 inches, how is it
classified?
A. True slump
B. Shear slump
C. Zero slump
D. Collapsed slump
Rationale: A 0-inch slump indicates very stiff concrete, classified as
zero slump.
4. What does the air content test using the pressure method measure?
A. Water-cement ratio
B. Total air content in freshly mixed concrete
C. Slump
D. Compressive strength
, Rationale: The pressure method measures the total air content,
which affects durability and freeze-thaw resistance.
5. Why is it important to consolidate concrete during placement?
A. To increase slump
B. To remove entrapped air and ensure proper bond
C. To reduce water content
D. To make it dry faster
Rationale: Consolidation eliminates air pockets and improves
bonding between aggregate and cement paste.
6. How is concrete temperature measured in the field?
A. Using a thermometer in the air
B. Using a sling psychrometer
C. Using a calibrated concrete thermometer inserted into the mix
D. By observing curing rate
Rationale: Concrete temperature is measured by placing a
thermometer directly into freshly mixed concrete.
7. Which of the following can affect the slump of concrete?
A. Aggregate size
B. Water content
, C. Cement content
D. All of the above
Rationale: Slump is influenced by water-cement ratio, aggregate
size, and cement content.
8. What is the purpose of performing a unit weight (density) test on
concrete?
A. To determine air content
B. To measure slump
C. To verify proper proportioning and consistency
D. To determine compressive strength
Rationale: Unit weight tests help confirm the mix design and ensure
consistent batching.
9. Which tool is used to consolidate concrete in a small test sample for a
unit weight test?
A. Slump cone
B. Tamping rod
C. Rebar
D. Thermometer
Rationale: The tamping rod is used to compact the concrete in the
container to remove air voids.
Grade I Practice Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of performing a slump test on fresh
concrete?
A. To measure compressive strength
B. To determine air content
C. To assess workability
D. To evaluate durability
Rationale: The slump test is used to measure the consistency or
workability of fresh concrete, not its strength or air content.
,2. When performing a slump test, what should be done after filling the
slump cone in three layers?
A. Tap lightly once
B. Rod each layer 25 times with a tamping rod
C. Fill and immediately lift the cone
D. Apply water to the surface
Rationale: Each of the three layers must be rodded 25 times to
ensure uniform compaction.
3. During a slump test, if concrete has a slump of 0 inches, how is it
classified?
A. True slump
B. Shear slump
C. Zero slump
D. Collapsed slump
Rationale: A 0-inch slump indicates very stiff concrete, classified as
zero slump.
4. What does the air content test using the pressure method measure?
A. Water-cement ratio
B. Total air content in freshly mixed concrete
C. Slump
D. Compressive strength
, Rationale: The pressure method measures the total air content,
which affects durability and freeze-thaw resistance.
5. Why is it important to consolidate concrete during placement?
A. To increase slump
B. To remove entrapped air and ensure proper bond
C. To reduce water content
D. To make it dry faster
Rationale: Consolidation eliminates air pockets and improves
bonding between aggregate and cement paste.
6. How is concrete temperature measured in the field?
A. Using a thermometer in the air
B. Using a sling psychrometer
C. Using a calibrated concrete thermometer inserted into the mix
D. By observing curing rate
Rationale: Concrete temperature is measured by placing a
thermometer directly into freshly mixed concrete.
7. Which of the following can affect the slump of concrete?
A. Aggregate size
B. Water content
, C. Cement content
D. All of the above
Rationale: Slump is influenced by water-cement ratio, aggregate
size, and cement content.
8. What is the purpose of performing a unit weight (density) test on
concrete?
A. To determine air content
B. To measure slump
C. To verify proper proportioning and consistency
D. To determine compressive strength
Rationale: Unit weight tests help confirm the mix design and ensure
consistent batching.
9. Which tool is used to consolidate concrete in a small test sample for a
unit weight test?
A. Slump cone
B. Tamping rod
C. Rebar
D. Thermometer
Rationale: The tamping rod is used to compact the concrete in the
container to remove air voids.
