Protection Technology of Piles Foundation Engineering Wrapped with Glass Fiber Reinforced Plastic Composites

Field research was conducted to evaluate the national piles foundation engineering that adopted glass fiber reinforced plastic (GFRP) composite layer as anti-corrosion measures in splash and tide zones. Mass variation rate method was used to study the diffusion behavior of seawater to GFRP composites. The second Fick's law of diffusion was used to predict the service life of GFRP composite layer, and the relationship between service life and thickness of GFRP composite layer was built. Results showed that the diffusion behavior of seawater to GFRP composites conformed to the second Fick's law of diffusion. With the thickness of 2 mm, the life resistant to seawater penetration of 189 GFRP composites was about 36 years; while the MFE-2 epoxy vinyl ester based GFRP composites was about 60 years. The GFRP composites showed excellent anti-corrosion property to seawater.