A tack coat is applied mainly to:
Correct answer: D. Bond an existing bituminous surface to a new layer
- A. Seal an unpaved subgrade before base placement
- B. Reduce evaporation from fresh concrete
- C. Improve the bearing capacity of weak soil
- D. Bond an existing bituminous surface to a new layer
Explanation
A tack coat is a thin bituminous application used to bond two bituminous layers. A prime coat is applied to an untreated granular base, so confusing these two treatments is a common error.
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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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