Concrete Corrosion Mapping System
Sample Applications
- Bridge Decks
- Highway Slabs
- Parking Garages
- Concrete Piers & Docks
- Substructures
- Pre-cast Structures
- Foundations
- Reinforced Concrete Pipe
- Warehouse Floors
- Tunnels
General Information
The nature of concrete corrosion is an exchange of energy within different sections of the reinforcing steel. At the anode, corrosion occurs and iron ions are released into the electrolyte. The relative energy levels can be determined in relation to a reference electrode with a stable electrochemical potential. A high impedance voltmeter is connected between the reinforcing steel and a reference electrode placed on the surface of the concrete. The resulting potential reading on the voltmeter is an indication of the energy levels (corrosion activity) of the steel in the vicinity of the reference cell.
Half cell potential measurements serve as an important means of determining the probability of corrosion activity on the structure's reinforcing steel. These measurements, which are related to the electrochemical nature of corrosion, allow an accurate survey to be performed in a short period of time.
Data from these surveys can be plotted to provide an easy to interpret graphic picture of the structure. From this plot, as typically shown below, probable corrosion areas and the total area of the structure subject to corrosion can be determined.
Typical concrete slab section with steel reinforcement (rebars).
Potential measurements obtained on 4' centers of 24' x 48' panel.
