Aramid fibers AS FIBER ®

ASPHALT FIBERS 4.0 – It’s the fibers that makes the difference

AS FIBER ® significantly reduces thermal cracking, cracks caused by material fatigue and the formation of ruts and is thus capable of extending the service life of an asphalt surface by as much as 50%

Conventional asphalt

When pressure is exerted over a long period of time, it causes ruts. Tensile forces can be absorbed only to a limited extent, leading to cracks.

Asphalt with AS FIBER ®

The three-dimensional system increases the restoring force of the asphalt surface and absorbs compressive and tensile forces. This results in a considerable reduction in rut formation and improved thermal stability and ensures that tensile forces from cryogenic and shear stress are dissipated without causing any damage.

AS FIBER ® Extending Asphalt Service Life and Preventing Damage

Asphalt road surfaces are susceptible to damage caused by tensile forces, leading to issues such as thermal cracking, fatigue cracks, and rut formation. These problems not only compromise the integrity of the roads but also result in costly repairs.

Strengthening Asphalt Surfaces and Defending Against Tensile Forces
AS FIBER® aramid fibers offer a solution to these challenges by reinforcing asphalt surfaces. They enhance the ability of asphalt to absorb tensile forces without sustaining damage. The three-dimensional reinforcement provided by these fibers is evenly distributed throughout the entire thickness of the asphalt, ensuring optimal strength and durability

AS FIBER ®

Established quality to suit the highest standards

Effectiveness Testing: AS FIBER® a Positive Impact on Asphalt Mixtures
Comprehensive tests on AC 11 DS / AC 16 DS mixtures have demonstrated the effectiveness of AS FIBER® fibers. Results from rut formation and compressive strength tests provide compelling evidence of their positive impact. Additionally, thermal stress restrained specimen testing has revealed impressive figures, including low cracking temperatures as low as -26.3 °C and a high measured failure stress of 4,470 N/mm².

Comparative Analysis: AS FIBER® for Durable Asphalt Surfaces
Specimens made from PA 11 mixtures with and without fiber reinforcement have shown that sections without fibers experience ten times higher surface wear. This highlights the significant contribution of AS FIBER® asphalt fibers in creating longer-lasting asphalt surfaces.

AS FIBER® fibers address the problem of asphalt surface damage by reducing thermal cracking, fatigue cracks, and rut formation. The effectiveness of these fibers is substantiated by rigorous testing, showcasing their ability to improve the durability and longevity of asphalt roads.

Vorteile

Fewer cracks, and those that do occur are bridged

No need for any change in installation methods

100% recyclable

Service life increased by around 50%

Rut formation reduced by > 50%

Thermal stability increased

Conventional asphalt and AS FIBER ® compared

IBQ Institute Mixture test results:

Mixture type	C 11 UHSF-FA (AS Fibers)	AC 11 DS
Binder type	25/55-55 A	25/55-55 A RC
Density by volume [g/cm³]	2.372	2.384
Air void content (calculated) [% by volume]	2.8	2.3
Bulk density [g/cm³]	2.440	2.441
Rut depth [mm]	2.5	4.9
Strain rate [‰*10⁻⁴/n] (0.35 MPa)	0.8 / 0.0 / 1.0	12.3 / 13.1 / 7.7 (at inflection point)

Performance test:

In performance tests, the modified mixture showed superior results compared to the non-fiber specimens.

The modified mixture exhibited significantly shallower rut depths and lower strain rates than the conventional mixture (AC 11 DS).

Even without wax modification, the modified mixture with AS FIBER® asphalt fibers demonstrated increased strength, even at high temperatures.

These findings indicate that the modified mixture analyzed in the tests will have considerably longer service lives than conventionally manufactured AC 11 DS mixtures.

The key characteristics of the modified mixture aligned with industry standards (ZTV Asphalt-StB and TL Asphalt-StB).

Conventional asphalt

When pressure is exerted over a long period of time, it causes ruts. Tensile forces can be absorbed only to a limited extent, leading to cracks.

Asphalt with AS FIBER ®

Product information

AS FIBER ® fibers An additive with a host of benefits AS FIBER ® is a synthetic fiber mixture of aramid and polyolefin fibers approximately 18 mm long, intended to be used as three-dimensional reinforcement in binder and/or surface AS FIBER ® bridges cracks and significantly reduces thermal cracking, as well as cracks caused by material fatigue. It also cuts rut formation dramatically due to the mixture’s higher resistance to permanent deformation. These properties alone give asphalt modified with AS FIBER® a service life roughly 50% longer than that of conventional mixtures. Aramid fibers do not melt when the mixture is hot and are renowned for their high tensile strength and durability at both high and low temperatures. Key material characteristics

Material	Aramid (AS Fibers)	Polyolefin
Type	Monofilament fibers	Fibrillated fibers
Specific weight (g/cm³)	1.45	0.91
Tensile strength (MPa)	3000	483
Length (mm)	18	18
Color	Yellow	Yellow
Melting point (°C)	> 450	115 / 157

Metering / wet mixing time AS FIBER ® fibers are metered at between 0.5 kg and 0.8 kg per metric ton of mixture. The wet mixing time (with liquid asphalt) should be at least 45 seconds.

Packaging unit
Bag	0.5 kg
Box	35 bags (17.5 kg)
Pallet	24 boxes (420 kg)

Wiking AS-PE Asphalt

For more informationen please contact:

David Etzerodt

Sales Manager
+45 20 58 05 99
dke@danishfibres.dk