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X-ray computed microtomography (X-ray mCT) method is proposed to trace the corrosion features of steel bar in cementitious materials (e.g., concrete). Three-dimensional corrosion morphology (including morphology of steel corrosion, corrosion products, and cracks formation) are characterized and reconstructed. Experimental results demonstrate that X-ray mCT can track time-dependent development of corrosion products and the subsequent initiation and propagation of corrosion-induced cracks. In addition, scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) are used to morphologically and chemically analyze the corrosion result. The microscopic analysis result is found to be in a very good agreement with the image analysis measured by X-ray mCT. Furthermore, the total corrosion ratio of steel, obtained by the X-ray mCT, is calculated to be in a good correlation with the data measured by Faraday’s law as well as gravimetric method.

Investigation of a Novel 3D Non-Destructive Evaluation for Corrosion Process in Reinforced Concrete