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Q: When the bituminous surfacing is done on already existing blacktop road or over existing cement concrete road, the type of treatment given is
  • A. seal coat
  • B. tack coat
  • C. prime coat
  • D. spray of emulsion
Correct Answer: Option B - Tack coat– A tack coat is an application of a bitumen binder to an existing surface (black topped or otherwise) to ensure a bond between the new construction and the old surface. Prime coat– A prime coat is an initial application of a low viscosity liquid bituminous material to an absorbent surface preparatory to any super imposed bituminous treatment or construction.
B. Tack coat– A tack coat is an application of a bitumen binder to an existing surface (black topped or otherwise) to ensure a bond between the new construction and the old surface. Prime coat– A prime coat is an initial application of a low viscosity liquid bituminous material to an absorbent surface preparatory to any super imposed bituminous treatment or construction.

Explanations:

Tack coat– A tack coat is an application of a bitumen binder to an existing surface (black topped or otherwise) to ensure a bond between the new construction and the old surface. Prime coat– A prime coat is an initial application of a low viscosity liquid bituminous material to an absorbent surface preparatory to any super imposed bituminous treatment or construction.