Abstract
The use of monopiles for onshore and offshore wind turbines structures is gaining increasing popularity. However, steel exposed to atmospheric and oceanic environments is susceptible to corrosion. Previous studies suggested using concrete cover to inhibit corrosion, while limited promising result was achieved. In this regard, self-prestressing ultra-high-performance concrete (SPUHPC) utilizing the synergy between expansive agent (EA) and steel fibers (SF) was developed for concrete-steel tubular columns (CSTCs) to evaluate the corrosion behavior. Various concrete cover thicknesses were considered to examine the corrosion behavior under a constant anodic current. Results show that the apparent specific resistance was improved. The concrete cover cracking time and corrosion rate were delayed up to 40.1% and 97.4% with the combined addition of EA and SF in SPUHPC. Moreover, micro X-ray computed tomography (CT) analysis revealed that the combined use of EA and SF yields a denser microstructure. In addition, scanning electron microscopy (SEM) revealed that EA improved the bond for sand-matrix and fiber-matrix interface. An inverse relationship between average apparent specific resistance and average corrosion rate was identified quantitatively.
Published Version
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