Colorado Concrete Field Testing Technician Exam – Practice Questions with Correct Answers

COLORADO CONCRETE FIELD TESTING TECHNICIAN
EXAM QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) Q&A 2026 |INSTANT
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1. What is the primary purpose of a concrete slump test?
A. Measure compressive strength
B. Determine workability and consistency
C. Calculate cement content
D. Measure curing time
Rationale: Slump test evaluates the consistency and workability
of fresh concrete.
Correct Answer: B


2. Which ASTM standard governs the slump test?
A. ASTM C172
B. ASTM C143
C. ASTM C31
D. ASTM C150
Rationale: ASTM C143 covers slump of hydraulic-cement
concrete.
Correct Answer: B

,3. What tool is used in a slump test?
A. Flow table
B. Cone mold
C. Vicat apparatus
D. Compression machine
Rationale: A standard Abrams cone is used.
Correct Answer: B


4. How should concrete samples be obtained for field testing?
A. From the top of the truck
B. From the middle portion of discharge
C. From the first discharge only
D. From hardened concrete
Rationale: Middle portions represent uniform mix quality.
Correct Answer: B


5. What is the standard size of a slump cone?
A. 6 in top, 8 in bottom, 12 in height
B. 4 in top, 8 in bottom, 12 in height
C. 8 in top, 12 in bottom, 6 in height
D. 10 in top, 10 in bottom, 12 in height
Rationale: Standard Abrams cone dimensions are used
universally.
Correct Answer: B

,6. What does a zero slump indicate?
A. Very fluid concrete
B. Extremely dry mix
C. High water content
D. Over-cured concrete
Rationale: Zero slump indicates very stiff or dry mix.
Correct Answer: B


7. Which test measures air content in fresh concrete?
A. Slump test
B. Unit weight test
C. Pressure method test
D. Penetration test
Rationale: Pressure air meters measure entrained air.
Correct Answer: C


8. ASTM standard for air content by pressure method is:
A. ASTM C138
B. ASTM C231
C. ASTM C143
D. ASTM C1064
Rationale: ASTM C231 governs pressure method air content

, testing.
Correct Answer: B


9. What is the purpose of rodding during sampling?
A. Increase water content
B. Remove air pockets
C. Harden concrete
D. Reduce cement content
Rationale: Rodding ensures uniform compaction of sample.
Correct Answer: B


10. How many layers are used in a standard slump test fill?
A. 2
B. 3
C. 4
D. 5
Rationale: Slump cone is filled in 3 equal layers.
Correct Answer: B


11. Each layer in slump test should be rodded how many
times?
A. 10
B. 15
C. 25