M8 Motorway Slip Roads UK
Safetrack® provides long term improvement for M8 Motorway Slip Road.
Managing Agent BEAR Scotland on behalf of Transport Scotland manage the maintenance of the South East region of the Scottish trunk road network, including the M8 running from Edinburgh to Dunblane. This route is of strategic importance and is heavily trafficked especially around the Grangemouth refinery area.
Vehicles passing over joints in the road surface have led to localised failure within the wearing course, particularly in areas of high stress, such as the construction joints on slip roads and joints at the junction of slip roads and the main carriageway.
- M8 Motorway
The fretted joints of the M8 needed repairing and sealing to prevent water ingress and further damage to the otherwise sound asphalt. The repair also needed to be strong enough to cope with high volume HGV traffic and the additional loads created by acceleration/declaration and transverse loading across the joint during lane changes.
A rapid repair system was required in order to reduce disruption to road users during the works. The client required a recessed repair and traditionally, these have been slow and consequently expensive to install, with unacceptable levels of traveller disruption.
Consequently the Stirling Lloyd’s HAPAS approved Safetrack® Inlaid Road Repair system was selected.
A micro milling technique to reduce the amount of asphalt milled from the surface prior to inlaying the repair system was developed.
With Safetrack repair systems, the unique resin means a thinner recessed repair can be achieved than would be possible with a traditional asphalt based material. Less milling and less materials applied increases the speed of application and hence reduces cost and disruption. The unique resin system behind Safetrack crack and joint repair materials mean that the product is cold applied, reducing risks to operatives. The systems rapid cure also meant that the road could be returned to full traffic load in as little as half an hour after installation, as there was no residual heat to be lost from the system as would be the case with asphalt based materials.
The system’s rapid application enabled over 200 linear meters of fretted joint to be repaired per hour, important as due to the high volume of traffic the works had to cause minimal disruption; therefore the works were carried out over a series of night times closures with the road having to be reopened to traffic by 6am each morning.
By utilising a highly durable crack sealing system Transport Scotland has helped arrest further degradation of the M8 at this location, significantly increasing the service life of the asphalt surface. A longer life reduces the regularity of costly, environmentally unfriendly resurfacing works. Safetrack’s robustness will ensure that the fretted joint does not re-open despite the heavy wear, and its high modulus, thermoset resin composition ensures that it is highly rut resistant even under heavy HGV loading. Road user safety has been improved by restoring the road surface to its original profile and reinstating its skid resistance.