Thin bituminous liquid asphalt
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What is tack coat?
Tack Coat. Definition – What does Tack Coat mean? Tack coat is a thin layer of asphalt that ensures the bonding between old and new asphalt layers. It is also used in construction or for renovation of roads to achieve better strength. Tack coat is sticky, which is very important for forming a secure bond between the two layers of asphalt.
What type of asphalt is used for tack coat?
The most common type of asphalt material currently in use for tack coat applications is an asphalt emulsion. A number of different grades of the emulsion are used including both rapid set and slow set type materials. For the rapid set emulsions, usually, an RS- 1, RS- 1 h, CRS- 1 or a CRS- 1 h material is specified.
What happens if there is no tack coat on asphalt?
Poor tack coat application results in poor bonding of the asphalt layers. The usual pavement distresses associated with poor or no tack coat is slippage cracks (typically at locations where traffic is braking or accelerating) along with delamination of the surface lift.
Can tack coat be applied to damp pavement?
The pavement surface receiving the tack coat should be clean and dry to promote maximum bonding. Emulsified tack coat materials may be applied to cool and/or damp pavement, however, the length of time needed for the set to occur may increase (Flexible Pavements of Ohio, 2001  ).