Investigation on chloride ion diffusion in concrete affected by sodium D-gluconate via wire beam electrode technique

The effects of various concentrations of sodium D-gluconate (SD) on chloride ion diffusion in concrete were investigated using both the wire beam electrode (WBE) technique and the finite element method. WBEs were encapsulated within concrete and immersed in a 3.75 mol/L NaCl solution which contained either 0.0461 mol/L or 0.0152 mol/L SD. Observations indicated that the passive film on the part of WBEs was destroyed by chloride ions on the 14th day, with the surface potential falling below -0.47 VSCE. Furthermore, the number of active corrosion electrodes was less at 0.0461 mol/L SD than at 0.0152 mol/L SD. Simulated chloride ion concentrations on WBEs were in agreement with the experimentally obtained values, demonstrating the viability of WBEs as non-destructive tools for assessing chloride ion concentrations in concrete.