EVALUATION OF CHLORIDE INDUCED CORROSION FOR MILD-STEEL IN SIMULATED CONCRETE PORE SOLUTIONS USING NI-MYRIO AND CH INSTRUMENT

The current research aims to determine the rate of steel corrosion with simulated concrete pore solution when exposed to various concentrations of chlorides. Laboratory measurements were made with various levels of chloride contaminated solutions. Laboratory Experiments were performed using CH instrument and myRIO with LabVIEW software to evaluate the electrochemical technique of corrosion rate, i.e., potentio-dynamic polarization measurements. The results obtained from the above-said types of equipment were later incorporated into excel sheets and graphs; potential in volts versus log I (current) in amperes was plotted. A comparative analysis of the results obtained with the CH instrument and myRIO test setup revealed that there was a marginal error in the comparative analysis. This error between the two polarization methods of measurements was observed and recorded. The variation in the corrosion current with chlorides in ppm is almost linear. Further, the slope of the graph also provides an equation for the error. This equation can be used to study rebar polarization measurements in the NI-LabVIEW and myRIO interface. Furthermore, it is concluded from the integrated polarisation graph that as the chloride contamination increases, the rate of steel corrosion increases in the simulated pore solution. Therefore, the results shows that higher the chloride content in simulated pore solution, the rate of corrosion of steel immersed in the solution is high as it reaches 25000ppm and decreases gradually for 35000ppm. The error plot also shows that the results obtained with the CH instrument are in line with the data obtained from myRIO test setup. Therefore, myRIO test setup along with the LabVIEW program can be effectively used to evaluate and validate the polarization results.