Fibertex AM-2
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Stress relieving

Stress relieving To avoid reflective cracking of new asphalt Designing asphalt overlays with Fibertex AM-2 To protect the subsoil from water intrusion and thereby loss of bearing capacity Paving fabrics are widely used in both new road constructions and in road maintenance to reduce reective cracking in the pavement. The purpose is to distribute stresses originated from cracks in the lower part of the pavement by creating a stress relieving and/or waterproong interlayer membrane system. Fibertex AM-2 made from polypropylene fibres is a flexible pre-compressed needlepunched nonwoven fabric...

Causes for reflective cracking in asphalt overlays Fig. 1. The paving fabric absorbs differential movements in the asphalt layers preventing reflective cracking. Additionally it forms a waterproof interlayer preventing surface water from entering the old asphalt layer. Fig. 2. Without paving fabric, reflective cracking of the new asphalt overlay will occur and surface water will enter the old asphalt layer. This will accelerate deterioration of the entire road construction. Selecting bituminous tack coat Determining the penetration grade of the bituminous tack coat The tack coat should...

Stress relieving of bituminous tack coat The amount of bituminous tack coat should be sufficient to ensure the bitumen retention properties of the paving fabric and to bond the paving fabric and the new asphalt overlay to the existing pavement surface. The bitumen retention for Fibertex AM-2, In order to account for the condition of the pavement surface, an additional quantity of retention bitumen, Qc, should be specified. Even though it is often estimated on site, indications of The necessary amount of sprayed bituminous tack Thick liquid bitumen emulsions: Q is the total amount of...

Thin liquid bitumen emulsion: (Bitumen content: 50% ≤ E ≤ 65%): The application of thin liquid bitumen emulsion, is a two step process: Step 1. The bitumen emulsion is sprayed onto the existing pavement surface to create a sticky surface for the unrolling of the paving fabric. The amount of bitumen emulsion is calculated as: Step 2. The bitumen emulsion is sprayed onto the paving fabric to create a waterproofing membrane. The amount of bitumen emulsion is calculated as: Unrolling of Fibertex AM-2 If the bituminous tack coat consists of hot melted bitumen, the unrolling of paving fabric can...

Stress relieving Overlaps Longitudinal overlaps should be approx. 10 cm and transverse overlaps approx. 20 cm. Fig. 8. Manual unrolling of Fibertex AM-2 can only be done in squares, demanding extra overlap in curves. Fig. 7. A sufcient overlap in both longitudinal and transverse direction is recommended. Transverse overlaps should be made in the paving direction to prevent edge pick-up by the asphalt paver. To ensure total saturation of the overlap, extra bituminous tack coat should be added between the two layers of paving fabric.

Paving with hot mixed asphalt material Operation of paving machinery when using paving fabrics The retention heat of the hot asphalt material paved on top of the paving fabric must be sufcient to soften the underlying bitumen to ensure maximum saturation of the fabric. Unrolling of the paving fabric and distribution of asphalt material are often done simultaneously to allow for trafc on the fabric. If crawlers or vehicle tyres stick to the paving fabric they may damage the fabric. To avoid this, some asphalt material has to be spread in the wheel tracks. Standard hot mixed asphalt materials...

Denmark France Czech Republic South Africa Facts about Fibertex Fibertex Nonwovens A/S is a market-leading manufacturer of nonwovens for industrial and technical applications. With corporate office in Aalborg, Denmark, and manufacturing sites in Denmark, the Czech Republic, France and South Africa, Fibertex is globally represented. Since its foundation in 1968, Fibertex has continuously expanded and today manufactures nonwovens for customers all over the world for many different applications. Close to our customers Our goal is to be local on the global market. Sales staff, subsidiaries and...