The greatest challenge for asphalt systems is damage to the asphalt road surface caused by tensile forces from traffic loads. Cracks in the asphalt road surface can also occur due to thermal expansion.

Asphalt fibres are used in the surface layer in particular. A good example of the use of asphalt fibres is the high-quality stone mastic asphalt system, a special type of asphalt for surface layers with a high content of bitumen and stone chips. Asphalt fibres are used as stabilising additives to bind the bitumen in the mix to the aggregates in the formulation and to prevent it from running off during production, transport and installation.

Function of the fibre:
• Increased durability of the covering
• STW asphalt fibres significantly extend the service life of the asphalt
• Positive influence on plastic deformations under high load
• Prevention of fatigue cracks
• Greater thixotropy
• STW asphalt fibres enable the base layer of the asphalt to be reduced by approx. 6 cm.
• Low temperature crack resistance
• Reduced rutting
• Increased resistance to ageing
• Fibre absorbs tensile loads