COLORADO CONCRETE STRENGTH TESTING TECHNICIAN
CERTIFICATION EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) Q&A 2026 |INSTANT
DONLOAD PDF
1. What is the primary purpose of concrete strength testing?
A. To determine color consistency
B. To evaluate compressive capacity
C. To measure temperature only
D. To check aggregate size
Rationale: Strength testing determines the load-bearing
capacity of concrete.
Correct Answer: B
2. Which standard test method is commonly used for
compressive strength?
A. ASTM C172
B. ASTM C31
C. ASTM C39
D. ASTM C143
Rationale: ASTM C39 covers compressive strength of cylindrical
concrete specimens.
Correct Answer: C
,3. What is the standard curing period for 28-day strength
testing?
A. 7 days
B. 14 days
C. 28 days
D. 56 days
Rationale: 28 days is the standard benchmark for concrete
strength.
Correct Answer: C
4. What tool is used to measure concrete slump?
A. Penetrometer
B. Slump cone
C. Rebound hammer
D. Flow table
Rationale: Slump cone measures workability of fresh concrete.
Correct Answer: B
5. Which factor most affects concrete strength?
A. Cement color
B. Water-cement ratio
C. Aggregate shape only
D. Air temperature only
Rationale: Water-cement ratio directly controls strength
,development.
Correct Answer: B
6. What is the purpose of curing concrete specimens?
A. To change color
B. To accelerate drying
C. To maintain moisture and temperature
D. To reduce aggregate size
Rationale: Proper curing ensures hydration continues for
strength gain.
Correct Answer: C
7. Which ASTM standard covers making and curing test
specimens in the field?
A. ASTM C31
B. ASTM C39
C. ASTM C94
D. ASTM C150
Rationale: ASTM C31 governs field curing of concrete cylinders.
Correct Answer: A
8. What is the typical shape of concrete compression test
specimens?
, A. Cubes
B. Cylinders
C. Prisms
D. Cones
Rationale: Cylinders are standard in the U.S. for compressive
tests.
Correct Answer: B
9. What happens if concrete is over-watered?
A. Increases strength
B. Decreases strength
C. Improves durability
D. No effect
Rationale: Excess water increases porosity and reduces
strength.
Correct Answer: B
10. Which test determines concrete workability in the field?
A. Air test
B. Slump test
C. Compression test
D. Density test
Rationale: Slump test measures consistency/workability.
Correct Answer: B
CERTIFICATION EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) Q&A 2026 |INSTANT
DONLOAD PDF
1. What is the primary purpose of concrete strength testing?
A. To determine color consistency
B. To evaluate compressive capacity
C. To measure temperature only
D. To check aggregate size
Rationale: Strength testing determines the load-bearing
capacity of concrete.
Correct Answer: B
2. Which standard test method is commonly used for
compressive strength?
A. ASTM C172
B. ASTM C31
C. ASTM C39
D. ASTM C143
Rationale: ASTM C39 covers compressive strength of cylindrical
concrete specimens.
Correct Answer: C
,3. What is the standard curing period for 28-day strength
testing?
A. 7 days
B. 14 days
C. 28 days
D. 56 days
Rationale: 28 days is the standard benchmark for concrete
strength.
Correct Answer: C
4. What tool is used to measure concrete slump?
A. Penetrometer
B. Slump cone
C. Rebound hammer
D. Flow table
Rationale: Slump cone measures workability of fresh concrete.
Correct Answer: B
5. Which factor most affects concrete strength?
A. Cement color
B. Water-cement ratio
C. Aggregate shape only
D. Air temperature only
Rationale: Water-cement ratio directly controls strength
,development.
Correct Answer: B
6. What is the purpose of curing concrete specimens?
A. To change color
B. To accelerate drying
C. To maintain moisture and temperature
D. To reduce aggregate size
Rationale: Proper curing ensures hydration continues for
strength gain.
Correct Answer: C
7. Which ASTM standard covers making and curing test
specimens in the field?
A. ASTM C31
B. ASTM C39
C. ASTM C94
D. ASTM C150
Rationale: ASTM C31 governs field curing of concrete cylinders.
Correct Answer: A
8. What is the typical shape of concrete compression test
specimens?
, A. Cubes
B. Cylinders
C. Prisms
D. Cones
Rationale: Cylinders are standard in the U.S. for compressive
tests.
Correct Answer: B
9. What happens if concrete is over-watered?
A. Increases strength
B. Decreases strength
C. Improves durability
D. No effect
Rationale: Excess water increases porosity and reduces
strength.
Correct Answer: B
10. Which test determines concrete workability in the field?
A. Air test
B. Slump test
C. Compression test
D. Density test
Rationale: Slump test measures consistency/workability.
Correct Answer: B
