Appendix E 1 Adhesion and Cohesion Characteristics
The fluid characteristics of a PMB are very different from those of conventional bitumen. Increases in viscosity and binder cohesion (internal strength) as a result of polymer modification are usually accompanied by a decrease in binder wetting ability (adhesion) and therefore a reduction in the capacity for initial adhesion to the aggregate particle.
Particular attention is required to all aspects of field procedures that influence adhesion, including:
- use of adhesion agent
- aggregate condition and precoating
- cutting back
- ambient conditions and preparation of pavements
- spraying and covering of binder.