What is happening?

The scheme involves structural concrete repairs to the verge piers and foundation of the bridge at Coaley Cambridge, Gloucester.

When and where is this happening?

The works are now underway on three quarters of a mile of the M5 between junctions 13 and 14.

Why is this happening and what will it cost?

Structural repairs are being carried out to the piers and foundation of the bridge because of the presence of thaumasite which is a form of sulphate attack on concrete. Thaumasite is formed when sulphates diffuse into concrete from adjacent ground.  The cement paste becomes incohesive mush which is removed by hand. The presence of thaumasite reduces the binding ability of the concrete, resulting in a loss of strength and integrity of the concrete.

 The cost of the scheme is £1 million.

How will the scheme be carried out?

The bridge structure requires heavy propping for support whilst deck repairs are carried out. Please be aware lifting operations are being carried out adjacent to the live carriageway.

There are closures of lane 1 and the hard shoulder both northbound and southbound throughout the works and a 50 mph speed limit is in place.

What are the benefits?

The work will strengthen the bridge and avoid the need for further repairs.

How do I find out more information ?

More information will be posted on this project page as it becomes available. You can subscribe to be alerted when updates are made.

If you have any queries about this project you should contact the Highways Agency Information Line by emailing ha_​info@​highways.​gsi.​gov.​uk or calling 0300 123 5000.