Corrosion monitoring for prestressed concrete cylinder pipe spigot with combined use of Tafel extrapolation and surface acoustic wave methods

• Published in: Construction & building materials Vol. 337; p. 127572
• Main Authors: Wang, Xu, Hu, Shaowei, Li, Wenhao, Hu, Yuquan
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 27.06.2022
• Subjects: Corrosion monitoring; Damage index; PCCP spigot; Prestressed concrete cylinder pipe; Surface acoustic wave; Tafel extrapolation; Surface acoustic wave; Prestressed concrete cylinder pipe; Tafel extrapolation; Corrosion monitoring; Damage index; PCCP spigot
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2022.127572

•This paper proposes a novel corrosion monitoring method for PCCP spigots.•For this, a combined Tafel extrapolation & SAW method was developed.•This approach was used to obtain self-corrosion rates and output voltage–time curves.•Mortar coating shows anti-corrosion; sulfate hinders chloride rusting of PCCP spigot.•Fitting curve of damage indices was used to quantitatively monitor corrosion states. A novel corrosion monitoring method for prestressed concrete cylinder pipe (PCCP) spigots that combines the Tafel extrapolation and surface acoustic wave (SAW) methods is proposed. Tafel extrapolation and the SAW method are used to determine the self-corrosion rates and output voltage–time curves for a single steel plate and PCCP spigot at different corrosion rates. The mortar coating features a vital anti-corrosion effect on PCCP spigots. Sulfate inhibits chloride rusting of PCCP spigots. For PCCP spigots, normalization based on amplitude is suitable for monitoring the entire rusting process; normalization based on energy is more suitable for early stage monitoring.