3d imaging and quantification of iodide concentration in cementitious material by X-ray computed tomography

Abstract Porous materials exhibit complex ionic transport processes that are relevant to many field applications, such as chloride-induced corrosion and the scavenging of radioactive isotopes in cementitious systems. In this work, a non-destructive method is presented to quantify local iodide concentration in cementitious mortar. X-ray Computed Tomography is used to detect changes in attenuation resulting from spatial and temporal variations in iodide concentration, while chemical analysis provides calibration to obtain absolute concentration values. Iodide is selected as a chemically similar tracer for chloride while offering substantially higher X-ray attenuation, enabling reliable contrast in tomographic imaging. Validation tests indicate very good agreement between measured and predicted concentrations when the method is applied to before–after comparisons on the same specimen under strictly controlled experimental conditions.