Seawalls are vital structures that protect coastal areas from erosion and flooding caused by waves and tides. Traditionally, steel and concrete have been the go-to materials for constructing seawalls due to their durability and strength. However, especially in recent years, composite sheet piling has emerged as a compelling alternative with several distinct advantages. Here are some reasons why composite sheet piling is gaining popularity over steel or concrete for seawall construction.

First and foremost, composite sheet piling offers superior corrosion resistance compared to steel and concrete. It is no surprise that steel structures are susceptible to rust when exposed to saltwater, leading to degradation over time. Similarly, concrete can deteriorate due to the harsh marine environment. In contrast, composite piles, typically made from pultruded fiberglass reinforced polymer (FRP), are inherently resistant to corrosion, ensuring long-term durability and minimal maintenance.

Another significant advantage of composite sheet piling is its weight. Traditional steel and concrete seawalls are heavy, making them cumbersome to transport and install, and requiring heavy machinery and substantial labor costs. Composite piles, on the other hand, are lightweight yet strong, making them easier to handle and install. This characteristic reduces installation time and costs, making composite sheet piling an attractive option for coastal projects.

Composite sheet piling also provides superior design flexibility and customization options. Unlike steel and concrete, which have limited shapes and sizes, composite materials can be molded into various profiles and dimensions to suit specific project requirements. This versatility allows engineers to design seawalls that optimize performance and aesthetics while meeting environmental and regulatory standards.

Post project completion, rock mattresses and SCDOT Class F Armor Stone were set on both sides of installed sheet pile.

One final, but important consideration should be mentioned. As more and more data are collected on the environmental impact of the materials used in construction projects, composite seawalls show great promise for environmental sustainability compared to steel and concrete alternatives. Steel production involves significant energy consumption and carbon emissions, while concrete production contributes to greenhouse gas emissions and habitat destruction through aggregate mining. Composite piles are manufactured using methods generally considered less environmentally impactful, and the longevity of composite seawalls reduces the need for frequent replacements, which further reduces resource consumption and waste generation.

In conclusion, composite sheet piling offers numerous advantages over traditional steel or concrete materials for seawall construction. Its superior corrosion resistance, lightweight nature, design flexibility, and environmental sustainability make it an attractive choice for coastal protection projects. As concerns about climate change and environmental conservation grow, the adoption of composite materials represents a sustainable and resilient solution for safeguarding coastal communities against the impacts of rising sea levels and extreme weather events.