LOUISIANA STRUCTURAL CONCRETE
QUALITY ASSURANCE EXAMINATION
WITH ACTUAL QUESTIONS AND VERIFIED
ANSWERS, PLUS EXPLAINED
RATIONALES/EXPERT VERIFIED FOR
GUARANTEED 100% PASS 2026/LATEST
UPDATE/INSTANT DOWNLOAD PDF
1. During placement of structural concrete for a bridge deck, the
quality assurance inspector observes that the concrete slump is
significantly higher than the approved mixture design allows. What
is the most appropriate initial QA response?
A. Allow placement because higher slump always improves
consolidation
B. Add cement to the concrete at the placement site
C. Stop or control acceptance of the affected load and investigate the
cause and authorized corrective procedure
D. Add water until the concrete reaches the desired slump
Answer: C.
Rationale: Concrete must conform to the approved mixture and
specified acceptance criteria. An excessive slump may indicate
unauthorized water addition, incorrect batching, admixture problems,
or other deviations that can affect strength, durability, segregation,
and finishing characteristics. The QA inspector should document the
condition and follow the project’s approved disposition procedure
rather than independently modifying the mixture.
1
, 2. Which property of fresh concrete is most directly evaluated by a
standard slump test?
A. Compressive strength
B. Workability or consistency
C. Air-void spacing
D. Cement fineness
Answer: B.
Rationale: The slump test provides an indication of the consistency
and workability of freshly mixed concrete. It does not directly measure
compressive strength, durability, cement fineness, or air-void spacing.
An acceptable slump must still be interpreted within the requirements
of the approved concrete mixture and project specifications.
3. A concrete cylinder test breaks at a load of 125,000 pounds. If the
cylinder has a diameter of 6 inches, what is the approximate
compressive strength?
A. 2,210 psi
B. 3,980 psi
C. 4,420 psi
D. 5,520 psi
Answer: C.
Rationale: The cylinder cross-sectional area is πd²/4, or approximately
28.27 square inches for a 6-inch-diameter cylinder. Dividing 125,000
pounds by 28.27 square inches gives approximately 4,421 psi. Proper
specimen preparation, curing, testing, and calculation are essential
because the resulting value may be used for concrete acceptance.
2
, 4. Why is curing particularly important during the early age of
structural concrete?
A. It prevents all concrete shrinkage
B. It allows continued hydration and development of strength and
durability
C. It eliminates the need for reinforcement
D. It immediately increases the water-cement ratio
Answer: B.
Rationale: Cement hydration requires adequate moisture and suitable
temperature conditions. Proper curing allows hydration to continue,
contributing to strength development, reduced permeability, improved
durability, and better surface characteristics. Poor curing can produce
a weak, porous surface and reduce long-term performance.
5. A QA inspector discovers that reinforcement has been placed with
substantially less concrete cover than required by the approved
drawings. Why is this condition significant?
A. It only affects the appearance of the concrete
B. It can increase corrosion risk and reduce durability and fire protection
C. It always increases structural capacity
D. It eliminates the need for curing
Answer: B.
Rationale: Concrete cover protects reinforcement from environmental
exposure and provides protection against corrosion and elevated
temperatures. Insufficient cover can accelerate reinforcement
corrosion and may also violate structural and durability requirements.
The condition should be documented and corrected according to the
approved project procedure before concrete placement when possible.
3
, 6. What is the primary purpose of concrete consolidation using
internal vibration?
A. To increase the water-cement ratio
B. To remove entrapped air and ensure concrete properly surrounds
reinforcement and embedded items
C. To replace curing
D. To reduce cement hydration
Answer: B.
Rationale: Proper consolidation removes undesirable entrapped air
and helps concrete flow around reinforcement, forms, inserts, and
other embedded components. Inadequate consolidation can cause
honeycombing, voids, rock pockets, reduced bond, and decreased
durability. Excessive vibration, however, can also cause segregation in
susceptible mixtures.
7. Which condition is most characteristic of concrete segregation?
A. Uniform distribution of all constituents
B. Separation of coarse aggregate from the mortar or paste
C. Complete cement hydration
D. Increased reinforcement cover
Answer: B.
Rationale: Segregation occurs when the constituents of fresh concrete
separate rather than remaining uniformly distributed. It can result
from excessive water, improper handling, excessive free fall, poor
mixture proportioning, or inappropriate vibration. Segregated concrete
can produce nonuniform strength and durability.
4
QUALITY ASSURANCE EXAMINATION
WITH ACTUAL QUESTIONS AND VERIFIED
ANSWERS, PLUS EXPLAINED
RATIONALES/EXPERT VERIFIED FOR
GUARANTEED 100% PASS 2026/LATEST
UPDATE/INSTANT DOWNLOAD PDF
1. During placement of structural concrete for a bridge deck, the
quality assurance inspector observes that the concrete slump is
significantly higher than the approved mixture design allows. What
is the most appropriate initial QA response?
A. Allow placement because higher slump always improves
consolidation
B. Add cement to the concrete at the placement site
C. Stop or control acceptance of the affected load and investigate the
cause and authorized corrective procedure
D. Add water until the concrete reaches the desired slump
Answer: C.
Rationale: Concrete must conform to the approved mixture and
specified acceptance criteria. An excessive slump may indicate
unauthorized water addition, incorrect batching, admixture problems,
or other deviations that can affect strength, durability, segregation,
and finishing characteristics. The QA inspector should document the
condition and follow the project’s approved disposition procedure
rather than independently modifying the mixture.
1
, 2. Which property of fresh concrete is most directly evaluated by a
standard slump test?
A. Compressive strength
B. Workability or consistency
C. Air-void spacing
D. Cement fineness
Answer: B.
Rationale: The slump test provides an indication of the consistency
and workability of freshly mixed concrete. It does not directly measure
compressive strength, durability, cement fineness, or air-void spacing.
An acceptable slump must still be interpreted within the requirements
of the approved concrete mixture and project specifications.
3. A concrete cylinder test breaks at a load of 125,000 pounds. If the
cylinder has a diameter of 6 inches, what is the approximate
compressive strength?
A. 2,210 psi
B. 3,980 psi
C. 4,420 psi
D. 5,520 psi
Answer: C.
Rationale: The cylinder cross-sectional area is πd²/4, or approximately
28.27 square inches for a 6-inch-diameter cylinder. Dividing 125,000
pounds by 28.27 square inches gives approximately 4,421 psi. Proper
specimen preparation, curing, testing, and calculation are essential
because the resulting value may be used for concrete acceptance.
2
, 4. Why is curing particularly important during the early age of
structural concrete?
A. It prevents all concrete shrinkage
B. It allows continued hydration and development of strength and
durability
C. It eliminates the need for reinforcement
D. It immediately increases the water-cement ratio
Answer: B.
Rationale: Cement hydration requires adequate moisture and suitable
temperature conditions. Proper curing allows hydration to continue,
contributing to strength development, reduced permeability, improved
durability, and better surface characteristics. Poor curing can produce
a weak, porous surface and reduce long-term performance.
5. A QA inspector discovers that reinforcement has been placed with
substantially less concrete cover than required by the approved
drawings. Why is this condition significant?
A. It only affects the appearance of the concrete
B. It can increase corrosion risk and reduce durability and fire protection
C. It always increases structural capacity
D. It eliminates the need for curing
Answer: B.
Rationale: Concrete cover protects reinforcement from environmental
exposure and provides protection against corrosion and elevated
temperatures. Insufficient cover can accelerate reinforcement
corrosion and may also violate structural and durability requirements.
The condition should be documented and corrected according to the
approved project procedure before concrete placement when possible.
3
, 6. What is the primary purpose of concrete consolidation using
internal vibration?
A. To increase the water-cement ratio
B. To remove entrapped air and ensure concrete properly surrounds
reinforcement and embedded items
C. To replace curing
D. To reduce cement hydration
Answer: B.
Rationale: Proper consolidation removes undesirable entrapped air
and helps concrete flow around reinforcement, forms, inserts, and
other embedded components. Inadequate consolidation can cause
honeycombing, voids, rock pockets, reduced bond, and decreased
durability. Excessive vibration, however, can also cause segregation in
susceptible mixtures.
7. Which condition is most characteristic of concrete segregation?
A. Uniform distribution of all constituents
B. Separation of coarse aggregate from the mortar or paste
C. Complete cement hydration
D. Increased reinforcement cover
Answer: B.
Rationale: Segregation occurs when the constituents of fresh concrete
separate rather than remaining uniformly distributed. It can result
from excessive water, improper handling, excessive free fall, poor
mixture proportioning, or inappropriate vibration. Segregated concrete
can produce nonuniform strength and durability.
4
