Kansas Construction Materials Testing
Qualification Advanced 100-Question
Practice Exam 2026 | Questions &
Answers with Detailed Rationales |
Complete Exam Prep & Study Guide
1. During concrete placement, the measured slump is substantially higher
than the approved mixture design permits. What is the most appropriate
action for the materials tester?
A. Add cement to the truck
B. Add aggregate until the slump is reduced
C. Document the result and notify the responsible quality-control/inspection
personnel
D. Automatically reject the entire load
Answer: Document the result and notify the responsible quality-
control/inspection personnel
Rationale: A materials tester should not arbitrarily modify an approved mixture.
The nonconforming result should be documented and reported so the authorized
project personnel can determine the appropriate disposition.
, 2. A concrete cylinder has a diameter of 6 in. and fails at 112,000 lb. What is
its approximate compressive strength?
A. 2,970 psi
B. 3,970 psi
C. 4,970 psi
D. 5,970 psi
Answer: 3,970 psi
Rationale: The cylinder area is π(6²)/4 = 28.27 in². Strength = 112,000/28.27 ≈
3,960 psi, commonly reported as approximately 3,970 psi depending on
rounding.
3. Why should the temperature of freshly mixed concrete be measured
promptly after sampling?
A. Temperature determines cement fineness
B. Concrete temperature affects setting, strength development, and workability
C. Temperature determines aggregate gradation
D. Temperature replaces slump testing
Answer: Concrete temperature affects setting, strength development, and
workability
Rationale: Fresh concrete temperature influences hydration, setting behavior,
water demand, workability retention, and strength development.
4. When preparing concrete cylinders for compressive-strength testing, the
primary purpose of proper consolidation is to:
A. Increase the water-cement ratio
B. Remove entrapped air and produce a representative specimen
C. Increase cement content
D. Prevent hydration
Answer: Remove entrapped air and produce a representative specimen
,Rationale: Proper consolidation minimizes unintended voids and honeycombing
in the specimen so the measured strength better represents the concrete being
tested.
5. A concrete mixture has 564 lb of water and 705 lb of cement per cubic
yard. What is the water-cement ratio by weight?
A. 0.60
B. 0.70
C. 0.80
D. 0.90
Answer: 0.80
Rationale: Water-cement ratio = water weight/cement weight = 564/705 = 0.80.
6. What is the principal purpose of an air-content test on normal-weight
concrete?
A. Determine cement fineness
B. Determine the percentage of entrained and entrapped air in fresh concrete
C. Determine aggregate absorption
D. Determine concrete density only
Answer: Determine the percentage of entrained and entrapped air in fresh
concrete
Rationale: Air testing establishes the volumetric air content of fresh concrete,
which is particularly important for mixtures exposed to freezing and thawing.
7. If concrete intended for freeze-thaw exposure has insufficient entrained air,
the most significant concern is:
A. Excessive aggregate absorption
B. Reduced durability from freezing and thawing
C. Increased steel yield strength
D. Increased soil density
, Answer: Reduced durability from freezing and thawing
Rationale: Properly distributed entrained air provides pressure-relief locations
when water in hardened concrete freezes and expands.
8. What should be done if a concrete cylinder mold is damaged or significantly
out of tolerance?
A. Use it anyway if the concrete looks good
B. Repair it with duct tape
C. Replace it with a compliant mold
D. Increase the cylinder curing temperature
Answer: Replace it with a compliant mold
Rationale: Defective or dimensionally incorrect molds can produce specimens
that do not comply with the applicable testing procedure and may affect test
results.
9. What does the term "segregation" mean in fresh concrete?
A. Chemical deterioration of cement
B. Separation of coarse aggregate from mortar or paste
C. Reduction in cement content
D. Loss of reinforcement bond
Answer: Separation of coarse aggregate from mortar or paste
Rationale: Segregation produces a nonuniform mixture and may result from
excessive handling, improper placement, excessive slump, or other conditions.
10.A concrete truck arrives at a placement site after an unusually long delay.
What is the most important initial consideration?
A. Whether the truck is painted correctly
B. Whether the concrete remains within the specified delivery and performance
requirements
Qualification Advanced 100-Question
Practice Exam 2026 | Questions &
Answers with Detailed Rationales |
Complete Exam Prep & Study Guide
1. During concrete placement, the measured slump is substantially higher
than the approved mixture design permits. What is the most appropriate
action for the materials tester?
A. Add cement to the truck
B. Add aggregate until the slump is reduced
C. Document the result and notify the responsible quality-control/inspection
personnel
D. Automatically reject the entire load
Answer: Document the result and notify the responsible quality-
control/inspection personnel
Rationale: A materials tester should not arbitrarily modify an approved mixture.
The nonconforming result should be documented and reported so the authorized
project personnel can determine the appropriate disposition.
, 2. A concrete cylinder has a diameter of 6 in. and fails at 112,000 lb. What is
its approximate compressive strength?
A. 2,970 psi
B. 3,970 psi
C. 4,970 psi
D. 5,970 psi
Answer: 3,970 psi
Rationale: The cylinder area is π(6²)/4 = 28.27 in². Strength = 112,000/28.27 ≈
3,960 psi, commonly reported as approximately 3,970 psi depending on
rounding.
3. Why should the temperature of freshly mixed concrete be measured
promptly after sampling?
A. Temperature determines cement fineness
B. Concrete temperature affects setting, strength development, and workability
C. Temperature determines aggregate gradation
D. Temperature replaces slump testing
Answer: Concrete temperature affects setting, strength development, and
workability
Rationale: Fresh concrete temperature influences hydration, setting behavior,
water demand, workability retention, and strength development.
4. When preparing concrete cylinders for compressive-strength testing, the
primary purpose of proper consolidation is to:
A. Increase the water-cement ratio
B. Remove entrapped air and produce a representative specimen
C. Increase cement content
D. Prevent hydration
Answer: Remove entrapped air and produce a representative specimen
,Rationale: Proper consolidation minimizes unintended voids and honeycombing
in the specimen so the measured strength better represents the concrete being
tested.
5. A concrete mixture has 564 lb of water and 705 lb of cement per cubic
yard. What is the water-cement ratio by weight?
A. 0.60
B. 0.70
C. 0.80
D. 0.90
Answer: 0.80
Rationale: Water-cement ratio = water weight/cement weight = 564/705 = 0.80.
6. What is the principal purpose of an air-content test on normal-weight
concrete?
A. Determine cement fineness
B. Determine the percentage of entrained and entrapped air in fresh concrete
C. Determine aggregate absorption
D. Determine concrete density only
Answer: Determine the percentage of entrained and entrapped air in fresh
concrete
Rationale: Air testing establishes the volumetric air content of fresh concrete,
which is particularly important for mixtures exposed to freezing and thawing.
7. If concrete intended for freeze-thaw exposure has insufficient entrained air,
the most significant concern is:
A. Excessive aggregate absorption
B. Reduced durability from freezing and thawing
C. Increased steel yield strength
D. Increased soil density
, Answer: Reduced durability from freezing and thawing
Rationale: Properly distributed entrained air provides pressure-relief locations
when water in hardened concrete freezes and expands.
8. What should be done if a concrete cylinder mold is damaged or significantly
out of tolerance?
A. Use it anyway if the concrete looks good
B. Repair it with duct tape
C. Replace it with a compliant mold
D. Increase the cylinder curing temperature
Answer: Replace it with a compliant mold
Rationale: Defective or dimensionally incorrect molds can produce specimens
that do not comply with the applicable testing procedure and may affect test
results.
9. What does the term "segregation" mean in fresh concrete?
A. Chemical deterioration of cement
B. Separation of coarse aggregate from mortar or paste
C. Reduction in cement content
D. Loss of reinforcement bond
Answer: Separation of coarse aggregate from mortar or paste
Rationale: Segregation produces a nonuniform mixture and may result from
excessive handling, improper placement, excessive slump, or other conditions.
10.A concrete truck arrives at a placement site after an unusually long delay.
What is the most important initial consideration?
A. Whether the truck is painted correctly
B. Whether the concrete remains within the specified delivery and performance
requirements
