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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.