Abstract
This study examines the corrosion behavior of steel tendons for prestressed concrete (PSC) structures under varying chloride concentrations and [Cl-]/[OH-] ratios. Tendons were exposed to controlled wet conditions, with chloride concentrations ranging from 0.0 to 0.25 mol/L, and [Cl-]/[OH-] ratios from 0.3 to 0.9. Results showed significant corrosion even at low chloride levels, with corrosion current density escalating from "high-risk" to "severe" as chloride concentration increased. The study also found that complete grouting is critical, as tendons exposed to humid environments without proper protection corrode significantly, irrespective of the chloride content. The findings suggest that traditional "critical chloride content" concepts may not apply to PSC tendons, highlighting the need for meticulous grout quality control to prevent corrosion. This research provides essential insights into the factors influencing tendon corrosion, offering guidance for improving PSC durability.
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