ERRORS INTRODUCED BY THE GUARD RING DEVICE IN THE ON-SITE MEASUREMENT OF REBAR CORROSION RATES. CORROSION OF REINFORCEMENT IN CONCRETE. PAPERS PRESENTED AT THE THIRD INTERNATIONAL SYMPOSIUM ON "CORROSION OF REINFORCEMENT IN CONCRETE CONSTRUCTION", BELFRY HOTEL, WISHAW, WARWICKSHIRE, MAY 21-24, 1990

In 1987 the authors published their first paper on the possibilities of on-site measurement of rebar corrosion rate. In that paper the transmission line model was applied in order to calculate the critical length reached by an electrical signal along a rebar and therefore, the corrosion rate by unit of metal and concrete surface. Other papers have been recently published based in the same transmission line model. In the present paper the...