The California Bearing Ratio test is mainly used to evaluate which property of a pavement subgrade?
Correct answer: D. The bearing strength of the soil
- A. The setting time of cement
- B. The viscosity of bitumen
- C. The abrasion resistance of aggregate
- D. The bearing strength of the soil
Explanation
The CBR test measures the penetration resistance of soil relative to a standard crushed-rock material and is used to assess subgrade strength. Bitumen viscosity, aggregate abrasion and cement setting require different tests.
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About Transportation Engineering
Transportation engineering covers highway planning and alignment, traffic studies, road geometric design, pavement materials and flexible or rigid pavement construction. It also includes railway, airport and traffic engineering concepts such as sight distance, superelevation, signals, capacity and level of service, distinguishing pavement failure from poor geometric design.
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