Asphalt Reinforcement 

Rotaflex, Fen Grove, Bexley, UK

Project Information

Client:London Borough of Bexley
Contractor:FM Conway
Consultant:London Borough of Bexley
Product:Rotaflex 830SL Geogrid
Quantity:2,200m2
Benefits:- 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, as 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 as 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 favorable finished product which we anticipate will last many more years.”

ABG Rotaflex 830 diagram for asphalt reinforcement

ABG Rotaflex 830SL geogrid system for asphalt reinforcement.

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Planed surface showing original concrete slab constructionPlaned surface showing original concrete slab construction laid down in the 1930s. Degradation of the joints and relative movement caused reflective cracking in the surface. Joints were filled and reinforced using Rotaflex low strain glass reinforcement grid with waterproof barrier preventing subsurface breakdown
Reflective cracks in the road surface causing poor ride qualityReflective cracks causing poor ride quality
Rotaflex geosynthetic installationRotaflex geosynthetic installation
Reinforced finished road surface with extended maintenanceReinforced finished surface with extended maintenance


Rotaflex Geogrid - Asphalt Reinforcement

Rotaflex is an asphalt reinforcing system designed to prevent premature road failure increasingly arising as a result of increasing axle loads. Ideal for Roads, Runways and Pavements.

more...

Rotaflex Geogrid - Asphalt Reinforcement
 

Products

Rotaflex Geogrid - Asphalt Reinforcement

Rotaflex is an asphalt reinforcing system designed to prevent premature road failure increasingly arising as a result of increasing axle loads. Ideal for Roads, Runways and Pavements.

more...

Rotaflex Geogrid - Asphalt Reinforcement
 

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