Performance evaluation of steel rebars corrosion inhibitions with strain gauges

摘要

A brief presentation of a laboratory technique with Strain Gauges (SG) detecting steel rebars corrosion in mortar specimens is given. The comparison of the application results obtained in specimens containing corrosion inhibitors is discussed inthis paper. The present technique is based on the phenomena of tension state, in which the mortar mass comes near the rebar area, during the formation of corrosion products. SG embedded in reinforcing mortar specimens during casting monitor the internalstresses. Mortar specimens with admixtures and corrosion inhibitors, immersed in a 3.5 percent wt NaCl solution, were tested under impressed potential. Corrosion measurements through SG were correlated with those obtained from charge resistant transferand compared with mass loss of the rebars. The test results obtained indicate that the SG technique, directly related to corrosion products, is suitable for the laboratory study of the influence of corrosion inhibitors in steel protection.