MAPESHIELD: GALVANIC CATHODIC PROTECTION FOR THE REINFORCEMENT RODS
Around 20 specialised building companies took part in the work, including Mapei, with a workforce of more than 250 people.
Once demolition work was under way on the foundation slab of the road over the stream on the west bank, jet grouting and preparation work on the new foundation slab could commence. The new bearing walls for the new road over the stream were then built.
To protect the reinforced concrete abutments and bearing walls as prescribed in the technical specification, galvanic cathodic protection was ensured by using MAPESHIELD I 30/20.
MAPESHIELD I is a solution developed by Mapei to protect reinforcement rods in repaired reinforced concrete structures against corrosion. It also offers a number of advantages if it is used to prevent corrosion in new reinforced concrete structures, particularly those that will be coming into contact with aggressive agents.
The area worked on in this phase was the first band of concrete around 2 m high from the bed of the stream. Three anodes were placed every metre along the abutments at a pitch of 0.7 m in a vertical direction.
MAPEI PAINT ON THE REINFORCED CONCRETE
Along the dividing walls, on the other hand, three anodes were positioned every 0.9 m, again at a vertical pitch of 0.7 m. In total, around 3,600 anodes were installed.
The new reinforced concrete structures were further protected by applying a specific Mapei coloured coating. Once the surfaces had been cleaned and checked to make sure they were sound, they were initially treated with the bonding promoter MALECH, an acrylic, water-based primer, and then painted with ELASTOCOLOR PAINT, an elastomeric paint for crack-bridging protection of internal and external surfaces, with long-lasting elasticity and high resistance to chemicals.