The extensive project incorporated conventional concrete repair work, reinstatement of shear strength at the column heads, the application of 13,000 square metres of protective coatings and 10,000 square metres of new deck membrane wearing course, as well as the design and installation of a cathodic protection system. The entire contract was carried out whilst the car park remained in use.

Initially, a detailed survey identified defective areas of concrete, which were cut out and repaired. Care was taken to identically match the repairs with the existing external exposed aggregate finish faces of the parapet walls. Previously painted areas were cleaned and prepared by high-pressure water jetting before receiving a primer and two coats of anti-carbonation paint. Exposed aggregate faces were coated with clear silane-siloxane based water repellent.

A cathodic protection system, which is being increasingly accepted as a practical and long-term solution for chloride contaminated concrete, was deployed to rehabilitate and monitor more than 12,000 square metres of reinforced concrete. A deck anode system was used underneath the new deck membrane.

CRL removed 2,800m2 of asphalt top deck (approximately 250 tonnes), before applying a new deck membrane to reform the falls necessary to provide adequate drainage. The membrane, comprising polyurethane and hard aggregate, over-coated with epoxy paint, was specially designed to be compatible with the cathodic protection system. The P.S.D. chose the colours of green and red to highlight pedestrian and vehicle areas.

Concrete Repairs Ltd. specialises in large car park refurbishment contracts. Many have included the use of cathodic protection to improve the durability of the concrete and minimise the likely future need for conventional repairs.