Natural asphalt may be employed for SMA as an additive to the road binder or modified binder under the following conditions:
• If it conforms to the requirements of EN 13108-4, Annex B, Tables B.1 and B.2, for natural asphalts with high or low-ash contents, respectively
• When natural asphalt is being incorporated in the road or modified binder by means of the following:
• Intermixing with heated binder in a liquid state in a tank
• Direct batching into a pugmill in the case of natural asphalt in the form of a powder or granulate with particles not exceeding 10 mm
14.4.2 Aggregates
All types of applied aggregate (coarse, fine, all-in,[74] added filler) should comply with the requirements of EN 13043 selected for a specific use. The appropriate NAD with requirements for SMA aggregates corresponding to the standard EN 13043 should be selected (examples of such requirements are detailed in Chapter 5).
The amount of added filler should be fixed. Hydrated lime and cement may also be used as fillers.
