Study on Corrosion Characteristics of Concrete‐Filled CFRP‐Steel Tube Piles under Hygrothermal Environment

Abstract

The corrosion damage of pile foundations caused by a hygrothermal environment is a significant factor that influences the service life of high-pile wharf structures. The concrete-filled CFRP-steel tube (CFRP-CFST) pile is a composite structure composed of external Carbon Fiber-Reinforced Polymer (CFRP) sheets and inner concrete-filled steel tubes. It has a high-bearing capacity and excellent corrosion resistance and is an ideal structure for pile foundations in aggressive environments. In this paper, twelve CFRP-CFST pile specimens with diameters of 114 mm and heights of 1200 mm and another forty-two CFRP-steel plate specimens with CFRP widths of 30–50 mm were built. A high hot and humid environment simulation system was designed to conduct corrosion experiments with these specimens. At different theoretical corrosion degrees, the half-cell potential, corrosion products, corrosion expansion, and adhesive property were investigated. The test results showed an obvious increase in the mechanical properties and corrosion resistance when the concrete-filled steel tube was externally bonded to CFRP sheets. The experimental results show that the CFRP-CFST pile is an effective way to protect piles from corrosion and can be widely used for high-pile wharfs in aggressive environments.

Carbon Fibre-Reinforced Polymer (CFRP) Composites in Civil Engineering Application—A Comprehensive Review

“…Using CFRP strip stirrups can enhance the shear resistance of concrete beams under static and fatigue loading [18]. Honghan Dong et al (2020) studied the corrosion damage caused by a hygrothermal environment to pile foundations. The CFRP-CFST pile is a composite structure comprised of external CFRP sheets and internal concrete-filled steel tubes.…”

“…The mechanical properties and corrosion resistance increased when the concrete-filled steel tube was externally bonded to CFRP sheets, as determined by the test results. The experimental findings demonstrate that the CFRP-CFST pile is an effective method for protecting piles from corrosion and can be widely used for high-pile wharves in hostile environments [19]. Ananthkumar et al (2020) investigated the effectiveness of composite materials, such as CFRP and GFRP, in preventing rebar corrosion.…”

Uso de PRFC para mejorar las propiedades mecánicas del concreto: una revisión

“…La resistencia y ductilidad de los pilotes pueden disminuir rápidamente debido a la corrosión del material en ambientes cálidos y húmedos. Los compuestos de PRFC se consideran un nuevo material para superar la debilidad de los pilotes [34] .…”

Energy Action Mechanism of Reinforced Sandstone under Triaxial Cyclic Loading and Unloading

“…Wang et al conducted a comparative test between ordinary steel bar and CFRP-reinforced coral concrete and established the corresponding calculation formula of the maximum crack width of CFRP coral concrete [15]. Dong et al believed that CFRP could effectively improve the corrosion resistance of concrete piles by conducting corrosion tests under a high temperature and humidity [16].…”