## 4 Research Results and the Analysis  
The data sets of the measured parameters (reinforcement stationary potential-Est, concrete cover resistivity-\(\Theta\), and corrosion current density-i\({}_{\text{cor}}\)) as a function of temperature were produced, as shown in Figure 6 (measured values) and Figure 7 (relative values referred to the values measured at T = 1 \({}^{\circ}\)C). The graphs show the relation between the obtained results and the specimen temperature. Analysis of the values of parameters determining the probability of reinforcement corrosion in the examined region, i.e., reinforcement stationary potential (Est) and concrete cover resistivity (\(\Theta\)), showed that the obtained values were in the ranges: E\({}_{\text{st}}\) = \(-212\div 295\) mV and \(\Theta\) = \(5.3\div 57.5\) k\(\Omega\cdot\)cm. As described earlier, the measurements were made on the same specimens at the same measuring points, but at varied temperature values. While the values of reinforcement stationary potential at almost all assumed temperatures were less than \(-200\) mV, which indicated the same 5% probability of reinforcement corrosion in the tested region (although with a wide spread of results), the values of concrete cover resistivity exhibited relatively high variability and, thus, led to significantly different conclusions about the corrosion probability-from low to high. Thus the temperature of the concrete cover has a large impact on its resistivity. The results of the third measured parameter, i.e., corrosion current density, were in the range of irrelevant corrosion activity, i\({}_{\text{cor}}\) = \(0.18\div 1.0\) uA/cm\({}^{2}\), which corresponded to the real condition of the tested specimens. In addition, at a given measurement point for a given parameter, the changes in its value versus temperature were quite similar. This indicates a constant (though not equally significant) effect of specimen temperature on the obtained values of the measured parameter. The values were averaged in order to discover the global trend of changes in the value of each parameter, as shown in Figure 6. The plot of average values is marked with a red thick line, whereas the black thin line denotes the approximating function in the form of a three-degree polynomial. Figure 6: _Cont._Figure 6: Parameter values measured on specimens at various temperatures; (**a**) reinforcement stationary potential, (**b**) concrete cover resistivity, (**c**) corrosion current density. Figure 7: _Cont._  
The average value of the reinforcement stationary potential noticeably dropped with the increase in temperature of the tested specimen. The plot of the absolute value changes ranged from E\({}_{\text{st}}\approx 0\) mV at T = 1 \({}^{\circ}\)C to E\({}_{\text{st}}\approx-77\) mV at T = 21 \({}^{\circ}\)C. These changes are not strictly monotonic and they are in the range of insignificant values (Figure 6a). The changes in the concrete cover resistivity values were more explicit and unidirectional. The average value decreased from \(\Theta\approx 41\) k\(\Omega\)-cm at T = 1 \({}^{\circ}\)C to \(\Theta\approx 10\) k\(\Omega\)-cm at T = 21 \({}^{\circ}\)C. The graph does not differ significantly from the linear one (Figure 6b). Changes in the average corrosion current density values were also proportional to changes in specimen temperature and ranged from i\({}_{\text{cor}}\approx 0.36\) uA/cm\({}^{2}\) at T = 1 \({}^{\circ}\)C to i\({}_{\text{cor}}\approx 0.72\) uA/cm\({}^{2}\) at T = 21 \({}^{\circ}\)C.  
To assess changes in the values of the measured parameters (E\({}_{\text{st}}\), i\({}_{\text{cor}}\), \(\Theta\)) obtained at different temperatures, the plots of relative values were prepared. All of the values were referred to those that were obtained at T = 1 \({}^{\circ}\)C chosen in this case as the reference temperature. This approach gives the possibility to correct the results in the case of need to compare them with the results that were obtained during measurements performed in different conditions, e.g., in different seasons.