Detection of exposed steel in the surface of reinforced concrete

Details Detection of exposed steel in the surface of reinforced concrete Detection of exposed steel in the surface of reinforced concrete

1990-04-18

1992-01-28

Snow, Walter E.

Electricity: measuring and testing

For insulation fault of noncircuit elements

Where a moving sensing electrode scans a stationary element...

G01Y 311, G01R 3108

Patent

active

050846809

ABSTRACT:
A method for detecting exposed steel in the surface of reinforced concrete, comprising the steps of: moving an electrode across an exposed surface of said concrete; connecting said electrode to one terminal of a power source; connecting the other terminal of said power source to the reinforcement of said concrete; said power source providing a high voltage current effective to produce a spark across an air gap occurring when exposed steel is detected, said spark initiating a means to signal the occurrence of said exposed steel.

REFERENCES:
patent: 2615077 (1952-10-01), Tinker
patent: 2920270 (1960-01-01), Saw
patent: 3284789 (1966-11-01), Fisher
patent: 3339136 (1967-08-01), Rasor et al.
patent: 4506485 (1985-03-01), Apostolos
A publication entitled "Cathodic Protection of Reinforced Concrete Using Metallized Zinc", Materials Performance, vol. 26, Dec., 1987, pp. 22-28.
A Federal Highway Administration Report entitled "Further Improvements in Cathodic Protection of Bridge Structures", Report FHWA RD-87/062, dated Jun., 1987, pp. 8-10, 46-50.
A California Department of Transportation report dated May, 1989, entitled "Development, Testing and Field Application of Metallized Cathodic Protection Coatings on Reinforced Concrete Substructures", Report No. FHWA/CA/TL-89/04, pp. 31, 64, 69, 92, 93.

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