Polyfunctional Modifiers for Bitumen and Bituminous Materials with High Performance

Table 2

Evaluation of grip (adhesion).

Feature of the bitumen film on the surface of crushed stone	Evaluation of grip
Binder film is completely retained on the surface, local decreasing of the thickness of a film can be observed	Excellent (five points)
Binder film is completely retained on the surface but is partially separated from the sharp corners and edges	Good (four points)
Binder film is retained on over 50% of crushed stone surface	Satisfactory (three points)
Binder film is retained on less than 50% of crushed stone surface. On the exposed surface individual bitumen droplets are observed	Poor (two points)