To adopt a national standard for HMA all States are moving to the SuperPave method of describing asphalt mixes.
===SuperPave===
SuperPave is not a type of hot mix asphalt. SuperPave is a method of designing Hot Mix Asphalt. SuperPave stands for Superior Performing HMA Pavements.
Prior to SuperPave, there were two recognized methods of asphalt mix design, the Hveem and Marshall methods.
Both of these design methods are named after their inventors. Both methods describe a series of standardized tests and testing equipment that is to be used to determine the optimum aggregate and asphalt binder (liquid asphalt) blend needed for an asphalt mix to perform. The Marshal method of mix design is the most widely used.
There have been many minor changes to the types of asphalt mixes since the turn of the millenium. These changes were needed to ensure that the performance of HMA meets today's traffic counts and loads. All of these changes, described different mix criteria, aggregate types and sizes, and asphalt binder (liquid asphalt), but all these changes continued to use the outdated Marshall method of mix design.
[[Category:Construction]]