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Ohio Concrete Strength Testing Technician Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2025|2026 Q&A | Instant Download Pdf
Q1. The standard test method for compressive strength of cylindrical
concrete specimens is:
A. ASTM C31
B. ASTM C138
C. ASTM C39
D. ASTM C1064
Rationale: ASTM C39 specifically covers procedures for compressive
strength testing of concrete cylinders.
Q2. Concrete cylinders for strength testing are typically:
- 2 in. x 4 in. 1 / 3
- 3 in. x 6 in.
- 6 in. x 12 in.
- 8 in. x 16 in.
Rationale: The most common standard cylinder size is 6 in. diameter by 12
in. height.
Q3. The ends of a concrete cylinder must be:
- Hollowed
- Left rough
- Smooth and perpendicular to the axis
- Coated in oil
Rationale: Proper end preparation ensures even load distribution during
testing.
Q4. Cap material used for cylinder ends must have:
- Higher strength than concrete
- Adequate strength but not weaker than the specimen
- No strength requirements
- Must be brittle
Rationale: Capping material must not fail before the concrete specimen.
Q5. The compression testing machine must apply load at:
- Any speed
- High speed
- A controlled constant rate 2 / 3
- Variable rate
Rationale: ASTM C39 requires a controlled rate to ensure reliable results.
Q6. The load is applied to the cylinder:
- At an angle
- Along its longitudinal axis
- From the side
- Under rotation
Rationale: Axial loading ensures proper compressive stress application.
Q7. If the cylinder is not centered, the result:
- Becomes more accurate
- Does not change
- May produce a lower strength result
- Causes the cylinder to elongate
Rationale: Off-center loading creates bending stress that reduces strength
readings.
Q8. The testing machine must be calibrated:
- Every 10 years
- Never
- At least annually
- Every month
- / 3
Rationale: Annual calibration ensures accurate strength measurements.
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