Warm Mix Asphalt is an asphalt that is produced and applied at a temperature around 20 – 40 °C lower than an equivalent “Hot Mix Asphalt” (HMA).
The information on this website focuses on Warm Mix Asphalt (WMA) technologies for producing asphalt at temperatures slightly above 100 °C with properties or performance equivalent to that of conventional HMA.
Thanks to the lower production and application temperature (around 20 – 40 °C lower than an equivalent Hot Mix Asphalt) this WMA has several advantages:
- Asphalt workers benefits: less emissions and improved working conditions
- Environmental benefits: less energy used and lower emissions
- Manufacturing and paving benefits: less hardening of the bitumen and WMA is fully compatible with the use of RAP.
- Paving operations benefits: WMA can be compacted at a lower temperature than HMA; producing WMA at HMA temperatures will permit an extended time for haulage and compaction. WMA will cool faster to ambient temperatures and therefore, the site can be opened for traffic at an earlier stage.
The lower emissions support the goal of the European asphalt industry to reduce bitumen fumes during paving operations.
There are various techniques available to produce this Warm Mix Asphalt.
This website provides the potential users and – producers of WMA information and it gives a short overview of: