AL CP Concrete Paving Contractor
Exam Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the primary purpose of a subgrade in concrete paving?
A. To provide a decorative base
B. To act as a permanent formwork
C. To provide a stable foundation for the concrete
D. To absorb water from the concrete
Answer: C
Rationale: A stable subgrade distributes loads evenly and prevents settling
or cracking of the pavement.
2. Which type of concrete is most commonly used for heavy-duty
concrete pavements?
A. Lightweight concrete
B. Portland cement concrete (PCC)
C. Foam concrete
D. Polymer concrete
Answer: B
Rationale: Portland cement concrete provides high compressive strength
suitable for vehicular loads.
3. What is the recommended minimum thickness for a concrete highway
pavement designed for heavy trucks?
A. 100 mm
B. 150 mm
C. 200 mm
D. 250 mm
,Answer: D
Rationale: Highways carrying heavy trucks require thicker concrete to resist
bending and fatigue.
4. Which of the following is a primary function of reinforcing steel in
concrete pavements?
A. Reduce curing time
B. Control tensile stresses and prevent cracking
C. Increase slump
D. Improve workability
Answer: B
Rationale: Concrete is weak in tension; steel reinforcement provides tensile
strength and crack control.
5. What is the purpose of contraction joints in concrete pavement?
A. To reduce surface friction
B. To act as expansion joints
C. To control cracking due to shrinkage
D. To allow for drainage
Answer: C
Rationale: Contraction joints create weak planes where cracks can form in a
controlled manner.
6. Which of the following admixtures can accelerate the setting time of
concrete?
A. Air-entraining agent
B. Water-reducing agent
C. Calcium chloride
D. Superplasticizer
Answer: C
Rationale: Calcium chloride speeds up the hydration of cement, reducing
setting time.
7. For proper compaction, freshly placed concrete pavements should be:
A. Lightly troweled only
, B. Vibrated to remove air voids
C. Left to self-level
D. Covered immediately with plastic
Answer: B
Rationale: Vibration eliminates air pockets, ensuring concrete density and
strength.
8. What is the main cause of joint spalling in concrete pavements?
A. Excessive curing
B. Poor joint design or insufficient reinforcement
C. Use of coarse aggregate
D. Low slump
Answer: B
Rationale: Spalling often occurs when joints are not properly reinforced or
load transfer is inadequate.
9. Which aggregate size is generally recommended for concrete paving?
A. 5–10 mm
B. 20 mm nominal maximum
C. 50 mm nominal maximum
D. 75 mm
Answer: B
Rationale: A 20 mm nominal size ensures workability and proper
consolidation for pavements.
10. What is the primary purpose of curing concrete pavements?
A. To increase surface texture
B. To reduce weight
C. To maintain moisture and temperature for proper hydration
D. To accelerate hardening
Answer: C
Rationale: Curing allows concrete to gain strength gradually and prevents
surface cracking.
Exam Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. What is the primary purpose of a subgrade in concrete paving?
A. To provide a decorative base
B. To act as a permanent formwork
C. To provide a stable foundation for the concrete
D. To absorb water from the concrete
Answer: C
Rationale: A stable subgrade distributes loads evenly and prevents settling
or cracking of the pavement.
2. Which type of concrete is most commonly used for heavy-duty
concrete pavements?
A. Lightweight concrete
B. Portland cement concrete (PCC)
C. Foam concrete
D. Polymer concrete
Answer: B
Rationale: Portland cement concrete provides high compressive strength
suitable for vehicular loads.
3. What is the recommended minimum thickness for a concrete highway
pavement designed for heavy trucks?
A. 100 mm
B. 150 mm
C. 200 mm
D. 250 mm
,Answer: D
Rationale: Highways carrying heavy trucks require thicker concrete to resist
bending and fatigue.
4. Which of the following is a primary function of reinforcing steel in
concrete pavements?
A. Reduce curing time
B. Control tensile stresses and prevent cracking
C. Increase slump
D. Improve workability
Answer: B
Rationale: Concrete is weak in tension; steel reinforcement provides tensile
strength and crack control.
5. What is the purpose of contraction joints in concrete pavement?
A. To reduce surface friction
B. To act as expansion joints
C. To control cracking due to shrinkage
D. To allow for drainage
Answer: C
Rationale: Contraction joints create weak planes where cracks can form in a
controlled manner.
6. Which of the following admixtures can accelerate the setting time of
concrete?
A. Air-entraining agent
B. Water-reducing agent
C. Calcium chloride
D. Superplasticizer
Answer: C
Rationale: Calcium chloride speeds up the hydration of cement, reducing
setting time.
7. For proper compaction, freshly placed concrete pavements should be:
A. Lightly troweled only
, B. Vibrated to remove air voids
C. Left to self-level
D. Covered immediately with plastic
Answer: B
Rationale: Vibration eliminates air pockets, ensuring concrete density and
strength.
8. What is the main cause of joint spalling in concrete pavements?
A. Excessive curing
B. Poor joint design or insufficient reinforcement
C. Use of coarse aggregate
D. Low slump
Answer: B
Rationale: Spalling often occurs when joints are not properly reinforced or
load transfer is inadequate.
9. Which aggregate size is generally recommended for concrete paving?
A. 5–10 mm
B. 20 mm nominal maximum
C. 50 mm nominal maximum
D. 75 mm
Answer: B
Rationale: A 20 mm nominal size ensures workability and proper
consolidation for pavements.
10. What is the primary purpose of curing concrete pavements?
A. To increase surface texture
B. To reduce weight
C. To maintain moisture and temperature for proper hydration
D. To accelerate hardening
Answer: C
Rationale: Curing allows concrete to gain strength gradually and prevents
surface cracking.
