Ouse Swing Bridge
The Project
The Ouse Swing Bridge was built as part of the Selby Bypass and was eventually opened in 2005. Ten years on, re-surfacing of the bridge was required.
Along with re-surfacing the roads on either side of the bridge, on close inspection, there were signs of wear and tear on the bridge surface areas, too. Consulting Engineers, Jacobs, approached IKO® for the specification and Galliford Try won the tender. BriggsAmasco was chosen as the installing contractor because of their installation machine equipment.
The Challenge
An even distribution of pre-coating chippings was required at a spread rate of approximately 13kg/m2. This is not easily achievable with a mastic asphalt-type surfacing due to heat retention in the product. Also, a tight working space meant using a mechanical spreader was impractical. All pre-coated chippings were applied by hand and carefully rolled into the surface at the correct time. North Yorkshire County Council stated that a specific test reading was required for surface skid resistance.
The Solution
IKO’s Permatrack™ Bridge Surfacing system was chosen — a waterproof mastic asphalt wearing course for Bridge Decks which offers improved material flexibility and maintains good rut resistance.
IKO Permatrack is used extensively as the surface course for expansion joints on both raised structures and a wide variety of bridge decks. Its advanced polymer modification makes IKO Permatrack highly durable and resistant to deformation with no compaction required.
Due to the initial shiny appearance of the finished IKO Permatrack surface, which is inevitable with this type of product, a retexturing process was carried out. A thin film of the laitance bitumen was removed to expose the aggregate within the product and also expose the pre-coated chippings. This provided the necessary skid resistance when tested against requirements.
IKO ROOFING SYSTEM
- IKO Permatrack
