Lowering the manufacturing temperature opens up new opportunities for asphalt as a construction material. Lower energy costs and less emissions are only part of the positive characteristics of low-temperature asphalt.

Despite the growing number of varied solutions that have appeared on the market we believe that it is not enough to focus exclusively on a particular method of introducing additives or foam bitumen. The entire process chain is affected, starting with drying at a reduced temperature through to specific mixing sequences and on to the introduction of recycling. Ammann has focused their research and development on the complete manufacturing process for low-temperature asphalt with an injection device being simply the beginning.


  • Same quality as hot asphalt
  • Lower energy consumption
  • Lower emission of CO2 per tonne of asphalt
  • Lower emissions at the road construction site
  • Ideal supplement to recycling
  • Reduction of bitumen ageing


New technologies enable the manufacturing of asphalt at reduced temperatures. The energy consumption per tonne of asphalt and the emissions at the road construction site drop significantly. Whilst conventional asphalt is produced at around 170°C, the low – temperature processes of today allow production temperatures of around 100°C. Ammann offers various technologies for this. Foam bitumen, waxes and other additives, special bitumen or alternative mixing cycles can be suitable for use, depending on the application.


Ammann is convinced that the future lies with low temperature asphalt. In cooperation with customers and laboratories, we have developed the Ammann Foam process.

This process is based on the foaming of bitumen with water and is employed in continuous and batch plants. Ammann Foam works without any chemical additives and also can be retrofitted to existing plants with minimal effort.

The process begins when hot bitumen is pumped into the foam generator. Cold water with no chemical additive is injected under high pressure and mixed with the hot bitumen. This water/bitumen mix is then forced through the outlet. The water expands when the mix leaves the foam generator, and the so -called foam bitumen is created.


  • Heating of the raw aggregate to approximately 115 ° C
  • Perfect mix of bitumen and aggregates
  • Asphalt compaction at low temperatures
  • Foam generator can be integrated into continuous and batch plants
  • Retrofitting to existing plants is possible