Low-temperature asphalt

The crucial difference compared to conventional hot asphalt is the processing and laying temperature. In figures, this is a temperature reduction of 20 – 40 °C. The accompanying effect in production and application include the improved energy balance and the reduced emissions during production as well as the lower workplace exposure during laying of the asphalt.

The desired temperature reduction during asphalt production is achieved by temporarily reducing the bitumen viscosity, which can be obtained by adding water or additives.

A temperature of at least approx. 140 °C is required for the bitumen (binder) to wet/coat the mineral. At lower temperatures, its viscosity is too high. The flowability, i.e. the viscosity, also depends on the bitumen type and can therefore vary greatly between the different bitumen types. Viscosity depends on temperature and type, i.e. hard bitumen has a higher viscosity than soft bitumen at the same temperature. Common temperatures are between 140 °C and 180 °C and the typical temperature is around 150 °C to 160°C.

A sufficiently low binder viscosity requires good wetting and coating of the aggregates in the mixer. In addition, the elasticity of the asphaltic mixture play an important role for laying and compactability during laying of the asphalt.

Low viscosity of bitumen can be achieved by the technology on the one handFoam bitumenand by usingadditives on theother hand.

BENNINGHOVEN is your reliable partner for this as well. Whether with the FOAM BITUMEN MODULE technology or by adding various additives with feed systems – we have the answer to your individual requirements. With Plug & Work, the system can be quickly retrofitted to any plant at any time.