FORTA-FI fiber is synthetic fiber (Aramid+ Polyolefin) that plays a major role in pavement performance. Polyolefin has a melting point of about 150ºC. Polyolefin appears to melt as the asphalt mix is mixed and compacted.
Does aramid only participate in strengthening the asphalt mixture?
What is the role of Polyolefin?
Thanks.
In general, it has been shown that fibers influence the cracking process, providing ductility to the mixture and increasing the toughness. Similarly, fibers can work as a crack barrier that helps to prevent the formation and propagation of cracks. Furthermore, fibers can change the viscoelasticity of bituminous materials. In fact, some experimental results have shown that fibers can improve the rheological properties of asphalt binder over a wide range of loading frequencies and temperatures. Additionally, the fiber addition to the asphalt binder increases the softening point and viscosity and decreases the penetration point leading to an improvement in rutting resistance.
The below article evaluated FORTA synthetic fibers in improving the toughness of concrete materials with discussions.
Article The Synergistic Effects of Different Types of Hybridized Syn...
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