Why is a tack coat needed?
What material should be used for a tack coat?
What application rate should be used?
When is a tack coat necessary?
Why is a tack coat needed?
To ensure a bond between the succeeding layers of a pavement
What material should be used for a tack coat?
A slow-setting emulsion, either SS-1, CSS-1, SS-I h, or CSS-1 h, works well when diluted 50/50 with water.
What application rate should be used?
You want to accomplish a very uniform application of about 0.03 to 0.05 gal/sy of residual asphalt on the layer to be tacked (a paint job, so to speak). Slow-setting emulsions generally have a residual asphalt content of about 2/3. Therefore, an application rate of 0.10 to 0.15 gals/sy of the diluted material will give […]
When is a tack coat necessary?
Almost always! On rare occasions when a pavement is being constructed which is not being used by traveling public and each succeeding lift is placed in rapid succession, a tack coat may not be necessary. However, a good cheap insurance policy is to always use tack coats.