🛣️ Materials Engineer Accreditation Exam Reviewer – Part 2 Asphalt, Bituminous Materials, and Road Works
📘 Topic Focus: Asphalt, Bituminous Materials, and Road Works
✍️ Total Questions: 25
🔍 Based on: DPWH Blue Book 2024 Edition
👷 Instructions: Select the correct answer for each multiple-choice question. Avoid scrolling to the bottom until you have answered all. The answer key follows the questions.
🧠 Knowledge Check – Asphalt, Bituminous Materials, and Road Works
- What is the minimum temperature for compaction of hot mix asphalt (HMA) as per DPWH standards?
A. 90°C
B. 110°C
C. 125°C
D. 140°C - Which test determines the penetration value of bitumen?
A. Ductility test
B. Flash point test
C. Penetration test
D. Specific gravity test - What type of asphalt is commonly used in surface course of flexible pavements?
A. Cutback
B. Emulsion
C. Bituminous concrete
D. Prime coat - What equipment is used to determine the field density of asphalt?
A. CBR machine
B. Core drill and balance
C. Cone penetrometer
D. Marshal hammer - Which bituminous surface treatment is used to waterproof and bind the surface of base course?
A. Prime coat
B. Tack coat
C. Seal coat
D. Fog seal - What is the standard thickness of asphalt concrete pavement for national roads?
A. 25 mm
B. 50 mm
C. 75 mm
D. 100 mm - Which test is used to measure the softening point of asphalt cement?
A. Flash point test
B. Penetration test
C. Ring and ball test
D. Ductility test - Which component is responsible for binding aggregates in asphalt mix?
A. Bitumen
B. Water
C. Lime
D. Fly ash - Which test determines the stability and flow of asphalt mix?
A. Los Angeles abrasion test
B. Marshal test
C. Penetration test
D. Benkelman beam test - What is the allowable air void content in the compacted asphalt mix?
A. 1–3%
B. 3–5%
C. 5–8%
D. 8–10% - Which test measures rebound deflection of pavement under a moving load?
A. CBR test
B. Marshal test
C. Benkelman beam test
D. Ductility test - What is the primary reason for applying a tack coat between asphalt layers?
A. Improve drainage
B. Ensure bond between layers
C. Increase thickness
D. Reduce cost - Which type of bitumen is used in cold weather construction?
A. Cutback asphalt
B. Emulsified asphalt
C. Modified asphalt
D. Blown asphalt - The minimum curing time for a prime coat before applying asphalt is:
A. 2 hours
B. 6 hours
C. 12 hours
D. 24 hours - Which of the following indicates asphalt pavement distress?
A. Rutting
B. Crazing
C. Bleeding
D. All of the above - The unit of Marshal Stability is:
A. N/mm
B. kg
C. kg/mm
D. N - The stripping of bitumen from aggregates occurs mostly due to:
A. High temperature
B. Poor compaction
C. Water action
D. Excess binder - What is the standard sample size for Marshal test specimens?
A. 50 mm diameter
B. 75 mm diameter
C. 100 mm diameter
D. 101.6 mm diameter - Which binder is most susceptible to temperature variation?
A. Emulsion
B. Cutback
C. Asphalt cement
D. Tar - What is used to restore flexibility and adhesion to aged asphalt surfaces?
A. Tack coat
B. Rejuvenator
C. Prime coat
D. Sealant - Which machine spreads asphalt evenly during paving?
A. Road roller
B. Asphalt paver
C. Motor grader
D. Bitumen distributor - What causes “alligator cracking” in asphalt pavements?
A. Overloading
B. Poor drainage
C. Weak subgrade
D. All of the above - Which weather condition is least suitable for asphalt paving?
A. Dry and warm
B. Light rain
C. Humid
D. Windy - How long should traffic be kept off a newly laid asphalt pavement?
A. 2 hours
B. 4 hours
C. 6 hours
D. Until cooled - Which type of aggregate is preferred for asphalt mixes?
A. Rounded
B. Flaky
C. Angular
D. Spherical
📋 Answer Key
1. D 2. C 3. C 4. B 5. A 6. B 7. C 8. A 9. B 10. B
11. C 12. B 13. A 14. C 15. D 16. C 17. C 18. D 19. D 20. B
21. B 22. D 23. B 24. D 25. C
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