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Ohio Concrete Field Technician Certification Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2025|2026 Q&A | Instant Download Pdf
- What is the primary purpose of conducting a slump test in concrete?
a) To determine air content
b) To measure concrete temperature
c) To measure workability
d) To determine compressive strength
Rationale: The slump test evaluates the consistency and workability
of fresh concrete.
2. The standard slump cone height is:
- 8 inches
- 12 inches
- 14 inches 1 / 3
- 10 inches
Rationale: The slump cone used in field testing is 12 inches tall.
3. Concrete temperature must be measured to:
a) Record mix proportions
b) Ensure proper placement and curing conditions
c) Determine water/cement ratio
d) Check aggregate moisture
Rationale: Temperature affects workability, hydration rate, and
curing.
4. The acceptable time limit between adding water and slump testing is:
- 5 minutes
- 10 minutes
- 2½ minutes
- 15 minutes
Rationale: AASHTO/ASTM standards require the slump test be
completed within 2½ minutes.
5. The unit weight test is performed to:
a) Determine slump
b) Determine curing rate
c) Determine density of fresh concrete
d) Determine hydration rate
Rationale: The unit weight test measures the density of freshly mixed
concrete. 2 / 3
6. Air entrainment in concrete is used to:
a) Increase strength
b) Improve freeze-thaw resistance
c) Shorten curing time
d) Increase density
Rationale: Air entrainment provides spacing to resist freeze-thaw
cycles.
- Which tool is used for consolidating concrete in a slump cone?
a) Trowel
b) Hammer
c) Tamping rod
d) Float
Rationale: A tamping rod is used to consolidate concrete in slump
testing.
8. The standard tamping rod length is:
- 12 inches
- 18 inches
- 24 inches
- 36 inches
Rationale: ASTM requires a tamping rod length of 24 inches.
9. Cylinders for compression testing are typically:
- 2x4 inches
- 4x6 inches
- / 3
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