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PI classification of asphalt binders [32].
| IP Value | Description |
|---|---|
| PI > +1 | Asphalts that are not very susceptible to temperature and show non-Newtonian flow behavior, with certain elasticity and thixotropy. |
| PI < −1 | Asphalts that are highly susceptible to temperature and exhibit Newtonian flow behavior. |
| −1 < PI < +1 | Asphalts that have rheological and flow characteristics intermediate between the two previous cases. Most of the asphalt binder used in paving has these characteristics. |
