Long-Term Performance of PTFE Bridge Bearing Pads in Coastal Bridges

Coastal bridge projects are in harsh marine atmospheric environments for a long time, facing multiple corrosive factors such as sea salt fog, high humidity, tidal alternating erosion and marine chemical medium erosion. The special coastal environmental conditions put forward ultra-high requirements on the corrosion resistance, anti-aging performance and long-term operational stability of bridge bearing pads. Traditional bridge bearing pads are prone to salt corrosion, mildew, aging and performance attenuation in coastal high-salt and high-humidity environments, resulting in early failure of bearings and shortened service life of bridge structures. PTFE bridge bearing pads have excellent marine environmental adaptability and ultra-stable long-term performance, becoming the most suitable bearing material for coastal bridge engineering PTFE SHEET.

The core advantage of PTFE bridge bearing pads adapting to coastal environments is their excellent salt fog corrosion resistance. The marine atmospheric environment contains a large number of chloride ions and salt fog particles, which have strong corrosive effects on polymer materials and metal structures. Traditional rubber bearings are easy to absorb salt moisture, resulting in molecular structure degradation, surface mildew and decreased mechanical strength. Ordinary plastic bearings will have aging cracking and friction performance failure under long-term salt fog erosion. PTFE materials have absolute chemical inertness, do not absorb water and salt, and do not react with marine salt fog, chloride and various corrosive media. Long-term coastal environment exposure will not cause structural corrosion and performance degradation of PTFE bearing pads.

In high-humidity alternating tidal environments, coastal bridge structures are often in the alternating state of wet and dry, which easily causes fatigue damage and microbial corrosion of bearing components. PTFE bearing pads have super hydrophobic performance, zero water absorption, and the dense and non-porous surface structure can completely isolate humid air and water vapor, avoiding internal moisture absorption and mildew breeding. The stable molecular structure can resist the fatigue damage caused by long-term wet and dry alternation, maintaining stable mechanical properties and friction and sliding performance. The matched PTFE TUBE accessories and flat sliding layers ensure the overall structural stability of the bearing system in complex coastal environments.

Long-term field monitoring data of coastal bridges shows that PTFE bridge bearing pads installed for more than 15 years still maintain complete structural integrity, smooth sliding surface and stable friction performance, without corrosion, aging and failure phenomena. Compared with traditional bearing pads that need large-scale replacement in 6-8 years in coastal environments, PTFE bearing pads have extremely excellent long-term durability, which can fully meet the design service life requirements of coastal bridge century projects.

With the rapid development of cross-sea bridges, coastal expressway bridges and coastal urban bridge projects, the demand for high-corrosion-resistant and long-life bridge bearings is increasing day by day. PTFE bridge bearing pads, with their excellent coastal environmental adaptability and ultra-long-term stable performance, solve the durability pain point of bridge bearings in marine environments, reduce the long-term maintenance cost of coastal bridge projects, and provide reliable long-term safety guarantees for the construction of high-quality coastal transportation infrastructure.