Characteristics Evaluation of Material Cracks in Irrigation and Drainage Facilities affected by Cold Environmental Effects

Abstract

As a detailed inspection of a concrete structure in service, core samples are usually drilled out and then mechanical properties are measured. In this study, damage estimation of concrete structures from core samples is developed, applying X-ray computed tomography method. Concretecore samples were taken from reinforced concrete of an existing canal. These samples are strongly influenced by freezing and thawing process. The crack distributions of concrete-core samples were inspected with helical CT scans, which were undertaken at one-millimeter intervals. Applying the concentration index parameter, quantitative estimation of crack damage is conducted by comparing X ray CT images with spatial statistics. These values are affected by the internal actual cracks. Thus, the damage of concrete structures could be detected by X-ray CT.