Patent ID: 8466695

Claim:
A method of detecting corrosion of rebars embedded in a building material made from concrete or other material having resistivity properties favorable or more favorable to electrochemical corrosion measurement, comprising: embedding in the same building material as the rebars, test bars made of the same material as the rebars or a material having similar corrosive tendencies; wherein each test bar is coated with an electrically insulating coating, except for one or more exposed sections located along the length of the test bar at locations other than or in addition to the ends of the test bar, such that each exposed section is operable as a node electrode; connecting at least one test bar to a corrosion measurement instrument; placing a counter electrode at a location near one of the node electrodes; receiving an input signal from the counter electrode at the measurement instrument; analyzing the input signal to determine if the signal indicates corrosion at the one of the node electrodes; and if the analyzing step indicates corrosion, using the location of the one of the node electrodes to determine the location of the corrosion.