Mayorhold multi-storey car park situated in the centre of Northampton, with spaces for 880 cars, has recently been refurbished using Sika concrete repair and coating systems as well as waterproofing membranes. Testing of this five level car park, which was built in 1973, had shown increasing deterioration of the reinforced concrete decks, due to chloride attack of the reinforcing steel within the structure.

 

The car park needed to be completely refurbished in order to extend the life-span of the structure.

Due to differing extents of corrosion activity within the steel reinforcement, a ribbon anode cathodic protection system together with the Sika® Ferrogard®-903 corrosion inhibitor was used. After the application of Ferrogard® to deck A the corrosion rate was reduced by over 90%, test data was gained using linear polarisation. The combination of these corrosion control methods provides a cost efficient, technically driven solution. Following repairs and preparation, the tough elastic waterproofing system Sikafloor®-350 N was applied to the top deck including Sikafloor®-359 N, a very tough seal coat, flexible polyurethane seal coat, with a very good colour stability and resistance to weathering. The intermediate decks were coated with Sikafloor®-261, a durable, epoxy resin intermediate decking system.

 

Repairs to all decks were carried out using Sika® Rapid Repair Mortar, a cementitious, fast setting mortar with high early strength. Soffits and pillars were repaired using the Sika® MonoTop® concrete repair system, and Sika® Ferrogard®-903 corrosion inhibitor was applied. SikaColor®-671 W, an anti carbonation decorative coating was applied to all surfaces. This environmentally friendly, water based, protective coating prevents water ingress, is vapour permeable and extremely durable.

 

The refurbishment works, together with the new upgraded lighting system won the International Concrete Repair Institute, Repair Project of the Year 2006 Award and has made Mayorhold car park brighter and safer, with an assured future.