How is a spray applied cathodic protection coating (Metalizing) wired to the rebar? Can you explain the process?
To effectively connect the metalized anode on the surface of the concrete to the rebar, an anode connector plates is used. The plate is installed on the surface of the concrete, which is torqued onto a threaded stainless steel rod (stud), which in turn is attached to the reinforcing steel. Depending on the surface area and geometry of the structural member, the number of anode plates vary. The procedure usually includes:
1. A concrete cover meter or pachometer helps to locate the reinforcing steel where anode connector plate is to be installed.
2. A 2-inch diameter hole is made into the concrete to expose the reinforcing steel.
3. Typically, a 0.25-inch diameter stainless steel threaded rod (stud) is attached to the exposed steel, using the tapping method. The threaded rod must extend to the outer concrete surface to facilitate attachment of the anode connector plate.
4. A layer of the metalized anode is applied on the plate on both sides prior to installing the plate.
5. The anode connector plate is secured with a rod protruding through the middle, and a stainless steel nut is secured over the anode connector plate to torque the plate down in place.
6. A second and third layer of metalized anode is applied over and around the plate to ensure adequate connection to the rest of the area.