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Appendix E 1.1 Use of Adhesion Agent

Recommended practice is to add adhesion agent to promote bonding with the aggregate particles. In most instances, double the amount of adhesion agent used for conventional C170 bitumen is required. It must be added to the sprayer about half an hour prior to spraying and the load thoroughly circulated. Most commonly used adhesion agents are not heat stable and should not be added to a tanker or other storage. Repeated dosage of adhesion agents to compensate for loss of effectiveness in storage can have an adverse effect on adhesion.

The adhesion agent selected must be compatible with the type of binder and the aggregate precoating material (see the discussion on aggregate precoating materials, below).