The authority only defines the width oft he road and the thickness of the layer. The used mix should be “mix used” has to match defined technical criteria, this is our instruction. But we do not tell the contractor how he has to match those criteria. If we can also use more reclaimed asphalt in conjunction with low-temperature asphalt and lower the temperature during production and installation then all the better. Access roads like these are subject to a lot of strain. In Switzerland the maximum load per axle is 11,5 tons distributed on two wheels. The farmers usually drive their machines along the same tracks. This results in depressions similar to those on highways that cause aquaplaning, etc. This is another aspect where blacktops for access roads need to demonstrate a certain stability.

Hans Büttikofer, department for structural improvements and production of the Bernese authority for agriculture and nature.


We have established that the blacktop can be installed and compacted using conventional methods. If it can be installed on this difficult terrain it can be installed anywhere.

Peter Schmutz, managing director at Walo Bertschinger AG.


We chose this blacktop because of its greater viscosity. Installing asphalt on an incline from top-down is difficult and demanding. But it actually worked very well with the foamed bitumen blacktop.

Stefan Lack, construction team leader at Walo Bertschinger AG.


Installation work is more agreeable as there are fewer vapours and no strong odour s.

Beat Messerli, foreman at Walo Bertschinger AG.


Low - temperature surfaces are the way ahead ! The use of foamed bitumen technology enables us to achieve energy savings of 1.5 kg of fuel oil per tonne of asphalt. We were able to save around 7.5 tonnes of CO₂ emissions during the installation work at Koppingen and therefore make a contribution towards sustainable road construction. There are no problems with the quality of the asphalt mix produced and it meets every requirement of the applicable standard both at the plant and after installation. The installation work at Koppingen was a positive and promising experience. We are convinced that low - temperature surfaces will prove to be ground-breaking for the asphalt and road building industry.

Samuel Probst, manager at Belagswerke Hans Weibel AG, Oberwangen ( Switzerland ).

We have deployed this technology, using manual labour as well as machines, for over 60,000 m² of asphalt surface. Asphalt recycling and foamed bitumen complement one another ideally.

Manuel Kellenberger, Asphalt Technology Camandona SA ( Switzerland ).

Low-temperature asphalt made using foamed bitumen is a benefit to the environment with no detrimental effect whatsoever on the construction industry.

Ivan Baumann, Head of Sales and Development, Berag Blacktop Plant.



Taking care of our environment is an important aspect in my opinion. Every method that contributes towards that goal is important. In our laboratories we examine the mixes produced by the mixing plants. Our production analyses show no differences to hot asphalt with regard to compaction, porosity, lifetime, smoothness, etc. Both are equally as good and comparable. I am convinced that foamed bitumen is the right way ahead and a good path to follow because it saves energy. One should not forget that the mix is 30–40 ° Celsius cooler than a hot asphalt mix. And these 30–40 ° are pure oil that otherwise needs to be combusted.

Felix Solcá, Head of the Building Materials Lab.



An asphalt mixing plant uses the most energy when it heats up the aggregate. If we can manage to reduce the temperature we can provide a major contribution towards reducing costs and the consumption of resources.

Andreas Biedermann, expert for low-temperature asphalt at Ammann.

Foamed asphalt makes it possible to produce and install a low-temperature blacktop. The recipe and quality are the same as with hot asphalt. Every aspect of the blacktop meets normative requirements.

Roger Fierz, Process Engineer at Ammann.


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