Asphalt Reinforcement

Rotaflex - Fen Grove, Bexley, UK

Client London Borough of Bexley

FM Conway

Consultant London Borough of Bexley

Rotaflex – Glass Fibre Asphalt Reinforcement



  • Rapid installation minimised disruption
  • Maintained existing thresholds
  • Extended pavement life
  • Reflective cracking protection

Project Description

Fen Grove is a residential area in the London Borough of Bexley. Bexley and Sidcup are well developed community areas largely with detached or semi-detached housing. During the interwar period the area became a highly desirable commuter area for Central London. Fen Grove, originally constructed in the 1930s, is an important spine road for the area. Construction was comprised of concrete slabs and expansion joints; it was then overlaid in 1988 with a flexible material to prolong the road’s life expectancy.

The Challenge

The road had suffered with reflective cracking from underlying differential settlement, failing expansion joints and poor ride quality, and had reached the end of its serviceable life. Complete re-construction was beyond budget consideration and would have been too disruptive to residents. The challenge was to restore Fen Grove to a tough and durable surface in as short a time as possible, since disruption to traffic had a high cost to residents and the wider area. Maintenance options were also limited due to fixed thresholds. Simple inlay was acknowledged to only provide limited improvement since it would not mitigate the damaging effects of reflective cracking.

The Solution

A grid reinforced overlay was chosen as the best option to give maximum pavement life in a cost effective way. A grid could be installed quickly to minimise disruption.

After consultation with ABG’s technical department and a site meeting Rotaflex 830SL geogrid asphalt reinforcement systems was chosen by the borough for the project. The original failed flexible material was stripped away and Rotaflex 830SL was applied directly to the concrete slab using a bitumen emulsion bond coat. Rotaflex’s integral polyester paving fabric provides a waterproof barrier and absorbs the bond coat, helping to create a strong bond to the receiving surface. Installation took one day and was completed by subcontractor Geogreen.

Nigel Theadgold, Highways Manager, London Borough of Bexley commented:

“The use of Rotaflex on Fen Grove allowed us to rethink the rehabilitation of the surface allowing us to achieve a very favourable finished product which we anticipate will last many more years.”

ABG Rotaflex 830SL geogrid system for asphalt reinforcement

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Assistance with technical comparisons, costing, design and supply were all provided by ABG.

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Additional information