Asphalt Reinforcement

Asphalt is one of the most commonly used materials for the surfacing of roads and airport runways, taxiways as well as other trafficked structures such as car parks and distribution centres.

The low tensile strength of asphalt means it can be easily damaged by a number of factors including settlement, fatigue, temperature fluctuations and vehicle loadings. Damage arising from reflective cracking usually manifests as a cracked or broken surface which has implications both for the comfort of the road user, vehicle damage and also to the subsequent on-going maintenance costs to the operator of the paved area. The ABG range of asphalt reinforcement grids offer systems designed specifically to mitigate these issues, offering increased life cycles for the pavement and a reduction in both new build and on-going maintenance costs.

The use of geosynthetics offer many benefits over the traditional methods of construction which they replace including reduced construction times, and thereby, project costs. By allowing thinner pavements to be designed they help minimise the environmental impact of the project by reducing the volume of materials used thereby reducing the transport loads both to and from the site.

Fortifix® is a revolutionary steel grid and geotextile composite asphalt reinforcement system for anti-reflective cracking to provide optimal reinforcement for road surfaces.

Rotaflex is an asphalt reinforcing system comprising of a coated glass fibre grid bonded to 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 occuring as a result of increasing axle loads.

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Typical applications

ABG’s asphalt reinforcement systems including Fortifix® and Rotaflex are commonly used to reinforce road surfaces that are prone to the following:

Control of Reflective Cracking

Fortifix® steel grid asphalt reinforcement system is an anti-reflective cracking interlayer with advanced steel cord structure laminated on a geotextile layer to provide optimal reinforcement for road surfaces. Using Fortifix® or Rotaflex in preventing reflective cracking can extend the service life of pavements by up to a factor of 4. Fortifix® and Rotaflex provides reinforcement to help prevent crack propagation and enables the overlay thickness to be reduced.

Widening and Haunching

A major problem in road widening schemes is that the new and old pavement structures tend to move apart due to differential settlement and thermal movement. By reinforcing the joint with Fortifix® and Rotaflex geogrid geosynthetic, the harmful effects on the final service can be virtually eliminated.

Thermal Fatigue

Thermal movement within concrete pavement results in contraction and expansion at construction joints. It is essential that the concrete pavement is well seated, a regulating course may be required. Fortifix® and Rotaflex asphalt reinforcement systems are laid to reinforce the new overlay and prevent or retard cracking.

Rutting

Fortifix® and Rotaflex is used in conjunction with stiffer bituminous layers to reduce rutting in pavements subject to intense wheel loadings and high ambient temperatures (e.g. bus lanes, approaches to cross roads and traffic lights.

Lean Concrete Roadbase

This is perhaps the most common problem faced by highway engineers. Fortifix® steel grid and Rotaflex glass fibre grid composite systems are both suitable for the resurfacing of roads with a lean concrete base. Both Fortifix® and Rotaflex are laid below the new asphalt overlay to provide crack control, reinforcement and waterproofing.

Subgrade Drainage & Waterproofing

Adequate subgrade drainage of pavements is the key factor for extending pavement life. Fortifix® and Rotaflex are used with the asphalt overlay to provide reinforcement and waterproofing. Fildrain geocomposite drainage layer performs as an efficient cut off and subsurface drainage system.

Economical Resurfacing

The increased overlay life using Fortifix® or Rotaflex can save one or more future overlays. This saves time, disruption,and up to 75% of costs over a 20 year period. Alternatively short term savings can be made by reduced overlay thickness and avoidance of kerb raising and threshold problems.

Setts

Sett paved roads pose engineer serious problems as it is unwise to remove solid well seated setts, but overlays will crack and delaminate. Fortifix® prevents cracking and holds surfacing materials together.

ABG offer a complete service in the field of asphalt reinforcement from initial design right through to a complete installation service.

Please contact us for further information on how ABG Geosynthetics can help your asphalt reinforcement project. Click for our Asphalt Reinforcement Grid Installation Service.

Fortifix steel grid composite asphalt reinforcement system being installed

Case studies

Additional information

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