In order to improve the bond between layers of pavement, a tack coat should be applied. A tack coat is very inexpensive insurance to improve the structural integrity of the pavement layer. There are many different types of tack coats and emulsions.
Research – Some Applications of the Elastic Theory Approach to the Structural Design of Flexible Pavements
1962-Some Applications of the Elastic Theory Approach to the Structural Design of Flexible Pavements-Norman W. McLeod