Warm mix additives, or WMAs, enable asphalt production and compaction at lower temperatures than traditional hot mixes.  

Warm mix additives are believed to work by lowering the binder's viscosity and improving the lubrication around aggregates in an asphalt mix. WMAs can make it easier to manufacture, transport, and compact a mix at lower temperatures. In fact, temperatures for warm mix asphalt can be between 30 to 120 degrees Fahrenheit lower than hot mix asphalt. 

There are three main types of warm mix additives: 

  • Organic additives derived from waxes and fatty amides that enhance lubrication at lower temperatures, 
  • Chemical additives such as emulsifiers and surfactants that reduce aggregate friction, and 
  • Water-based or foaming agents that introduce steam to improve aggregate coating. 

By incorporating WMAs, asphalt plants can cut fuel use by up to 20%, leading to lower carbon emissions and reduced greenhouse gases. Workers also benefit from safer conditions due to less heat and fewer harmful fumes onsite. 

Warm mix additives improve compaction efficiency, helping contractors meet strict density and void specifications for longer-lasting pavements. Additionally, WMAs can extend paving seasons and increase haul distances, offering greater operational flexibility. 

Importantly, warm mix asphalt can perform just as well as hot mix asphalt, supporting durability, smoothness, and density. These additives are compatible with various asphalt binders, including polymer modified bitumen, and can be used alongside reclaimed asphalt pavement and other performance-enhancing additives.  

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