CO Asphalt Paving Contractor Exam
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. Which of the following is the primary component of asphalt paving
mix?
A. Portland cement
B. Crushed stone
C. Bitumen
D. Sand
Answer: Bitumen
Rationale: Bitumen is the binding agent in asphalt paving, providing
durability and flexibility to the mix.
2. What is the optimal temperature range for laying hot mix asphalt?
A. 120–140°F
B. 150–170°F
C. 275–300°F
D. 350–400°F
Answer: 275–300°F
Rationale: Hot mix asphalt must be laid at high temperatures to
ensure proper compaction and bonding.
3. Which equipment is primarily used for compacting asphalt after laying?
A. Excavator
B. Loader
C. Roller
D. Grader
Answer: Roller
, Rationale: Rollers are used to compact asphalt to achieve the
required density and smooth surface.
4. What is the main purpose of tack coat in asphalt paving?
A. Reduce surface friction
B. Improve color
C. Promote bonding between layers
D. Increase thickness
Answer: Promote bonding between layers
Rationale: Tack coat is applied to ensure proper adhesion between
old and new asphalt layers.
5. Which type of asphalt is commonly used for high-traffic highways?
A. Cold mix
B. Hot mix dense-graded asphalt
C. Seal coat
D. Open-graded asphalt
Answer: Hot mix dense-graded asphalt
Rationale: Dense-graded hot mix asphalt provides strength and
durability needed for high-traffic roads.
6. What is the recommended slope for proper asphalt drainage?
A. 0%
B. 0.5%–1%
C. 2%
D. 5%
Answer: 2%
Rationale: A slope of about 2% ensures water drains off the
pavement, preventing damage.
7. Which aggregate size is typically used in the surface course of asphalt?
A. 25–40 mm
B. 10–20 mm
C. 5–10 mm
D. 40–50 mm
Answer: 10–20 mm
Rationale: Surface courses require smaller aggregates to produce a
smooth driving surface.
8. What is the purpose of a prime coat?
A. Seal cracks
B. Prepare base for asphalt layer
, C. Color the pavement
D. Increase friction
Answer: Prepare base for asphalt layer
Rationale: Prime coats penetrate the base and help the asphalt layer
adhere properly.
9. Which test measures the density of compacted asphalt?
A. Slump test
B. Core density test
C. Penetration test
D. Sieve analysis
Answer: Core density test
Rationale: Core density testing ensures the asphalt has been
compacted to specifications.
10. Which of the following can cause rutting in asphalt pavement?
A. Low traffic
B. Excessive load
C. Proper compaction
D. Cold mix asphalt
Answer: Excessive load
Rationale: Heavy loads deform the asphalt, causing rutting,
especially if compaction or mix is inadequate.
11. What is the main function of a prime coat?
A. Increase friction
B. Bond the base layer and asphalt
C. Color the pavement
D. Drain water
Answer: Bond the base layer and asphalt
Rationale: Prime coats enhance adhesion between the base and
asphalt surface.
12. What is the purpose of an open-graded asphalt mix?
A. Provide high durability
B. Reduce noise
C. Improve drainage
D. Increase friction
Answer: Improve drainage
Rationale: Open-graded mixes allow water to drain through the
pavement, reducing splash and hydroplaning.
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. Which of the following is the primary component of asphalt paving
mix?
A. Portland cement
B. Crushed stone
C. Bitumen
D. Sand
Answer: Bitumen
Rationale: Bitumen is the binding agent in asphalt paving, providing
durability and flexibility to the mix.
2. What is the optimal temperature range for laying hot mix asphalt?
A. 120–140°F
B. 150–170°F
C. 275–300°F
D. 350–400°F
Answer: 275–300°F
Rationale: Hot mix asphalt must be laid at high temperatures to
ensure proper compaction and bonding.
3. Which equipment is primarily used for compacting asphalt after laying?
A. Excavator
B. Loader
C. Roller
D. Grader
Answer: Roller
, Rationale: Rollers are used to compact asphalt to achieve the
required density and smooth surface.
4. What is the main purpose of tack coat in asphalt paving?
A. Reduce surface friction
B. Improve color
C. Promote bonding between layers
D. Increase thickness
Answer: Promote bonding between layers
Rationale: Tack coat is applied to ensure proper adhesion between
old and new asphalt layers.
5. Which type of asphalt is commonly used for high-traffic highways?
A. Cold mix
B. Hot mix dense-graded asphalt
C. Seal coat
D. Open-graded asphalt
Answer: Hot mix dense-graded asphalt
Rationale: Dense-graded hot mix asphalt provides strength and
durability needed for high-traffic roads.
6. What is the recommended slope for proper asphalt drainage?
A. 0%
B. 0.5%–1%
C. 2%
D. 5%
Answer: 2%
Rationale: A slope of about 2% ensures water drains off the
pavement, preventing damage.
7. Which aggregate size is typically used in the surface course of asphalt?
A. 25–40 mm
B. 10–20 mm
C. 5–10 mm
D. 40–50 mm
Answer: 10–20 mm
Rationale: Surface courses require smaller aggregates to produce a
smooth driving surface.
8. What is the purpose of a prime coat?
A. Seal cracks
B. Prepare base for asphalt layer
, C. Color the pavement
D. Increase friction
Answer: Prepare base for asphalt layer
Rationale: Prime coats penetrate the base and help the asphalt layer
adhere properly.
9. Which test measures the density of compacted asphalt?
A. Slump test
B. Core density test
C. Penetration test
D. Sieve analysis
Answer: Core density test
Rationale: Core density testing ensures the asphalt has been
compacted to specifications.
10. Which of the following can cause rutting in asphalt pavement?
A. Low traffic
B. Excessive load
C. Proper compaction
D. Cold mix asphalt
Answer: Excessive load
Rationale: Heavy loads deform the asphalt, causing rutting,
especially if compaction or mix is inadequate.
11. What is the main function of a prime coat?
A. Increase friction
B. Bond the base layer and asphalt
C. Color the pavement
D. Drain water
Answer: Bond the base layer and asphalt
Rationale: Prime coats enhance adhesion between the base and
asphalt surface.
12. What is the purpose of an open-graded asphalt mix?
A. Provide high durability
B. Reduce noise
C. Improve drainage
D. Increase friction
Answer: Improve drainage
Rationale: Open-graded mixes allow water to drain through the
pavement, reducing splash and hydroplaning.
