What is warm mix asphalt and what are its advantages?

Warm mix asphalt (WMA) is produced at 30-50C lower temperatures than hot mix using additives (waxes, zeolites), foaming (water injection), or organic additives. Advantages: reduced fuel consumption (15-35%), lower emissions, extended paving season, longer haul distances, improved compaction, and better working conditions. Mix workability maintained through modified binder rheology. Performance generally equivalent to HMA when properly designed. WMA adoption growing due to environmental and worker safety benefits.