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. The primary purpose of slump testing is to:
a) Measure air content
b) Determine workability of fresh concrete
c) Measure compressive strength
d) Determine water-cement ratio
b) Determine workability of fresh concrete
Rationale: Slump testing assesses the consistency and workability of fresh
concrete, not strength or air content.
2. Which type of slump is observed when concrete collapses completely
during a slump test?
, a) True slump
b) Shear slump
c) Collapse slump
d) None of the above
c) Collapse slump
Rationale: Collapse slump indicates that the concrete is too wet and
unstable to hold its shape.
3. When performing a slump test, how many layers should the cone be
filled in?
a) One
b) Two
c) Three
d) Four
c) Three
Rationale: The cone should be filled in three layers, each rodded 25 times to
ensure proper consolidation.
4. How should the slump cone be lifted during a slump test?
a) Twisted off
b) Pulled vertically upward slowly
c) Knocked over
d) Tilted to the side
,b) Pulled vertically upward slowly
Rationale: Lifting vertically minimizes disturbance of the concrete and
ensures an accurate measurement.
5. What is the typical time limit to perform a slump test after concrete
has been mixed?
a) 5 minutes
b) 15 minutes
c) 30 minutes
d) 60 minutes
b) 15 minutes
Rationale: The ACI specifies that slump testing should be completed within
15 minutes to reflect the concrete’s initial consistency.
6. The air content of freshly mixed concrete is primarily measured to:
a) Reduce weight
b) Improve freeze-thaw durability
c) Increase workability
d) Reduce strength
b) Improve freeze-thaw durability
Rationale: Entrained air improves resistance to freeze-thaw cycles, especially
in colder climates.
7. Which test is used to determine the air content of freshly mixed
concrete with coarse aggregate larger than 1 inch?
, a) Pressure method
b) Volumetric method
c) Slump test
d) Flow table test
a) Pressure method
Rationale: The pressure method is suitable for concrete with coarse
aggregates larger than 1 inch.
8. The unit weight of freshly mixed concrete is measured to determine:
a) Workability
b) Air content
c) Compressive strength
d) Slump
b) Air content
Rationale: Unit weight measurements help estimate air content, especially
in normal-weight concrete.
9. Which of the following factors can affect the slump of concrete?
a) Aggregate size and shape
b) Water content
c) Admixtures
d) All of the above
Grade I Practice Exam Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. The primary purpose of slump testing is to:
a) Measure air content
b) Determine workability of fresh concrete
c) Measure compressive strength
d) Determine water-cement ratio
b) Determine workability of fresh concrete
Rationale: Slump testing assesses the consistency and workability of fresh
concrete, not strength or air content.
2. Which type of slump is observed when concrete collapses completely
during a slump test?
, a) True slump
b) Shear slump
c) Collapse slump
d) None of the above
c) Collapse slump
Rationale: Collapse slump indicates that the concrete is too wet and
unstable to hold its shape.
3. When performing a slump test, how many layers should the cone be
filled in?
a) One
b) Two
c) Three
d) Four
c) Three
Rationale: The cone should be filled in three layers, each rodded 25 times to
ensure proper consolidation.
4. How should the slump cone be lifted during a slump test?
a) Twisted off
b) Pulled vertically upward slowly
c) Knocked over
d) Tilted to the side
,b) Pulled vertically upward slowly
Rationale: Lifting vertically minimizes disturbance of the concrete and
ensures an accurate measurement.
5. What is the typical time limit to perform a slump test after concrete
has been mixed?
a) 5 minutes
b) 15 minutes
c) 30 minutes
d) 60 minutes
b) 15 minutes
Rationale: The ACI specifies that slump testing should be completed within
15 minutes to reflect the concrete’s initial consistency.
6. The air content of freshly mixed concrete is primarily measured to:
a) Reduce weight
b) Improve freeze-thaw durability
c) Increase workability
d) Reduce strength
b) Improve freeze-thaw durability
Rationale: Entrained air improves resistance to freeze-thaw cycles, especially
in colder climates.
7. Which test is used to determine the air content of freshly mixed
concrete with coarse aggregate larger than 1 inch?
, a) Pressure method
b) Volumetric method
c) Slump test
d) Flow table test
a) Pressure method
Rationale: The pressure method is suitable for concrete with coarse
aggregates larger than 1 inch.
8. The unit weight of freshly mixed concrete is measured to determine:
a) Workability
b) Air content
c) Compressive strength
d) Slump
b) Air content
Rationale: Unit weight measurements help estimate air content, especially
in normal-weight concrete.
9. Which of the following factors can affect the slump of concrete?
a) Aggregate size and shape
b) Water content
c) Admixtures
d) All of the above
