Corrosion morphology of prestressing steel strands in naturally corroded PC beams

摘要

The geometric morphology of pits induced by corrosion has been investigated. To this aim, twenty-four seven-wire strands coming from 10 years old naturally corroded prestressed concrete beams have been analysed. The cross-sections of corroded strands were measured and examined in detail. The morphology of corrosion pits has been recorded by using a structured light 3D scanner and classified in terms of maximum pit depth, longitudinal dimension, and transversal width. Then, a new method for the approximate evaluation of the average pit depth of prestressing strands has been proposed. Finally, the pitting factor of the corroded samples has been calculated.(c) 2021 Elsevier Ltd. All rights reserved.