Keywords
Reinforced concrete, corrosion evaluation, x-ray computed microtomography; 3D reconstruction, non-destructive test
Abstract
X-ray computed microtomography (X-ray μCT) method is proposed to trace the corrosion features of steel bar in cementitious materials. Three-dimensional corrosion morphology (including morphology of steel corrosion, corrosion products and cracks formation) are characterized and reconstructed. Experimental results demonstrate that X-ray μCT 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 μCT. Furthermore, the total corrosion ratio of steel, obtained by the X-ray μCT, is calculated to be in a good correlation with the data measured by Faraday's law as well as gravimetric method.
DOI
10.5703/1288284316148
Included in
Investigation of a Novel 3D Non-Destructive Evaluation for Corrosion Process in Reinforced Concrete
X-ray computed microtomography (X-ray μCT) method is proposed to trace the corrosion features of steel bar in cementitious materials. Three-dimensional corrosion morphology (including morphology of steel corrosion, corrosion products and cracks formation) are characterized and reconstructed. Experimental results demonstrate that X-ray μCT 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 μCT. Furthermore, the total corrosion ratio of steel, obtained by the X-ray μCT, is calculated to be in a good correlation with the data measured by Faraday's law as well as gravimetric method.
