Rotaflex asphalt reinforcement grid comprises a polymer coated glass fibre geogrid bonded with a polyester geotextile. It forms a key component of sustainable road maintenance and construction and is designed to provide crack control, pavement reinforcement and to prevent premature road break-up occurring as a result of increasing axle loads.
Extensive on-site experience and research by major road laboratories has demonstrated the benefits of Rotaflex in eliminating or retarding reflective cracking, reducing rutting and extending the fatigue life of pavements. A four times increase in service life may be obtained, or alternatively a saving of up to 30% on pavement thickness can be made.
Rotaflex works by preventing strains within asphalt layers from reaching critical levels. Laid within an asphalt/bitmac pavement Rotaflex provides four essential requirements; for effective reinforcement, strengthening, sealing bond and stress absorption.
Rotaflex glass fibre grids are widely used in asphalt reinforcement and offer high tensile strength at low strain for effective reinforcement. The grids are dimensionally stable and bonded at the nodes within a protective polymer coating.
Glass fibre is both strong and flexible. It is thermally and chemically stable at bitumen mix temperatures of 200°C and it is not effected by de-icing salt, petroleum or bitumen. The high strength, low strain characteristics are important because unreinforced asphalt will crack at strains as low as 1%. Glass fibre has a Young’s Modulus of 70GPA (20 times that of asphalt) which means it provides effective reinforcement.
The aperture size has been optimised to be compatible with the tensile strength of the grid and the aggregate size of the overlay to ensure excellent interlayer bond.
The polyester textile absorbs bitumen during installation to create a waterproofing layer with excellent bond and stress absorption.
Rotaflex provides a more environmentally acceptable solution than thick overlays, deep planing or full reconstruction. Reduced overlay thickness requires fewer vehicle movements and helps conserve natural resources.
Typical Client Profile
- Highway Engineers & Contractors
- Highways Authorities
- Airport Engineers
- Local Authority Planning Depts.
Rotaflex is easy to handle and is rapidly installed. The road surface is swept and all pot holes and large cracks are filled with a bituminous material.
Bitumen emulsion or pure bitumen is sprayed on the prepared surface and Rotaflex is unrolled. The bitumen does not penetrate all the way through the Rotaflex until the Asphalt is laid, this permits the paver, trucks and limited site traffic to run on Rotaflex without damaging or pick up. The overlay is laid to normal specifications, temperatures, compaction and weather conditions.
An installation service is offered on Rotaflex through our asphalt reinforcement installation partner.
Hooke’s Law states that for any given stress in a material there is an associated strain. When the concern is reducing cracks in asphalt the consideration is limiting the strain. At the serviceability limit Rotaflex is at least 2-3 times stronger than polypropylene systems and therefore far more effective at inhibiting cracking. Many polypropylene grids cite ultimate tensile strength, but this is not a true indicator of performance.