The presentation of a new laboratory, non-destructive method of detection and checking the corrosion ofsteel rebars in mortar specimens is discussed in this paper. Themethod uses extensive meter sensors, such as the well knownstrain gages (SG) and is based on the phenomena of tension state,in which the mortar mass comes near the rebar area, after theformation of corrosion products. The SG are embedded inreinforcing mortar specimens during casting. Specimens areimmersed in a 3.5 wt% NaCl solution and a constant potential isapplied between steel rebar and graphite electrode in order toobtain fast corrosing conditions. As the embedded SG areaffected by volume changes, caused not only by corrosionproducts, all other disturbing parameters have been compensatedfor by the measurement method described. The method wasapplied in different types of mortar specimens in order to havetest and verification results. The reliability of the technique wasevaluated by measuring (a) the gravimetric weight loss of thereinforcing steel bars; (b) the electrical charge flow throughspecimens; and (c) the porosity of mortar mass. The test resultsobtained indicate that the methed is reliable and suitable for thelaboratory study of the corrosion factors and the influence ofconcrete admixtures in corrosion protection. 1999 ElsevierScience Ltd. All rights reserved.
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