Standard Recommended Practice for
Asphalt – Additives- and– Modifiers
AASHTO Designation: R 15-00 (2004)
This standard recommended practice covers the laboratory testing required to evaluate asphalt additives and modifiers in both neat asphalt and in asphalt-
aggregate hot mixtures.
The terms “additive” and “modifier” are used interchangeably and are broadly interpreted to include any materials added to asphalt binder in minor amounts,
other than mineral fillers, sand, and aggregates, whose purported effect is to improve the performance and service life of pavements or maintenance materials by
improving the properties of the asphalt binder and/or hot mix asphalt.
Following is a list of the common purposes for which an additive/modifier may be added:
Anti-Rutting (permanent deformation).
Thermal Cracking (low temperature cracking, thermal fatigue cracking).
Load-Associated Fatigue Cracking.
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