engleski

Mortar resistivity as a parameter for monitoring steel corrosion in alkali-activated materials

Alkali-activated materials (AAMs) offer a lot of potential for development and are widely regarded as a viable alternative to OPC due to their low carbon emissions and promising performance. However, existing understanding is insufficient to assure long-term reliability due to discrepancies in the reaction processes of AAM and OPC, as well as a wide range of unique AAM compositions. In this study, the long-term corrosion behaviour of reinforcing steel embedded in three different alkali-activated mortars was monitored in chloride rich environments throughout the test period. The half-cell potential and corrosion rate were determined by linear polarisation (LP) and the individual resistance of the mortar was determined by electrochemical impedance spectroscopy (EIS). The objective of this study is to determine an indirect method for evaluating the corrosion conditions of steel embedded in AAM. The mortar resistance (Rmortar), determined by fitting the EIS data, can roughly determine the condition of the steel and is a suitable tool for indirect measurements as an alternative to monitoring the corrosion potential (Ecorr), which is very sensitive to the composition of the pore solution and the availability of oxygen.

corrosion, resistivity, AAM

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