Material Sourcing and Alternative Materials

Green port development places strong emphasis on sustainable material sourcing because construction materials account for a significant share of a port’s environmental footprint. Traditional materials such as timber, steel, concrete, and masonry are associated with resource depletion, high greenhouse gas emissions, ecological impacts, and durability challenges. Timber harvesting can affect natural resources and marine ecosystems, while steel and concrete production are carbon intensive and often require substantial maintenance or replacement over their lifecycle.

Modern green port strategies focus on whole-of-life sustainability rather than simply substituting materials.

Procurement decisions increasingly consider embodied carbon, transport emissions, durability, maintenance needs, recyclability, biodiversity impacts, and lifecycle costs. Sustainable sourcing is supported by the use of recycled and reclaimed materials, including recycled plastics, wood-plastic composites, fiber-reinforced polymers (FRP), and reclaimed timber fibers. These materials reduce demand for virgin resources, divert waste from landfill, and offer improved resistance to corrosion and marine degradation.

A key innovation is the beneficial reuse of dredged materials and demolished concrete for reclamation, habitat restoration, coastal protection, and port expansion, supporting circular economy objectives. Alternative materials such as FRP composites and hybrid structural systems are increasingly used in marine infrastructure due to their durability and low maintenance requirements. Overall, sustainable sourcing, material reuse, and lifecycle optimization help ports reduce environmental impacts, enhance resilience, and improve long-term asset value.

Material sourcing is a critical aspect of green port development because a significant proportion of a port’s environmental footprint is determined during the procurement of construction materials. Traditional marine infrastructure has historically relied on timber, steel, masonry, and concrete. However, concerns regarding resource depletion, greenhouse gas emissions, ecological disturbance, and long-term durability have prompted ports to reconsider how construction materials are sourced and selected. PIANC (2009) notes that timber sourcing can contribute to depletion of natural resources and may introduce preservative chemicals into the marine environment, while steel and concrete production are associated with significant carbon emissions and deterioration in aggressive marine conditions. Traditional materials often require substantial maintenance or replacement within 25 to 100 years, increasing their lifecycle impacts.

Green port practice therefore emphasizes sustainable sourcing rather than simply selecting alternative products. Material procurement increasingly considers embodied carbon, transport emissions, durability, maintenance requirements, recyclability, and whole-of-life costs. PIANC’s Sustainable Ports guidance (PIANC, 2014) recommends that sustainability criteria be integrated into infrastructure procurement and contracting, including consideration of lifecycle impacts, resource efficiency, emissions, and biodiversity outcomes.

A key sourcing strategy is the use of recycled and reclaimed materials. Alternative marine construction products increasingly incorporate recycled plastics, reclaimed timber fibers, recycled glass, and other post-consumer materials. Fiber Reinforced Polymer (FRP) composites, wood-plastic composites (WPCs), and recycled plastic structural elements reduce demand for virgin raw materials while diverting waste from landfill. These materials can offer greater resistance to corrosion, marine borers, and chemical attack than traditional materials, which may result in longer service lives and reduced maintenance requirements, depending on product and exposure.

Environmental protection policies can strongly influence material sourcing decisions, particularly in island and coastal regions. Extraction of coral sands, reef-derived rock, and other natural aggregates is restricted or banned in some jurisdictions because of impacts on coastal stability, coral reef ecosystems, and marine habitats. Small island ports frequently face shortages of suitable aggregates and must therefore import construction materials, increasing project costs and transport-related emissions. This limitation has encouraged the exploration of alternative local materials, manufactured aggregates, and recycled products while reinforcing the importance of material efficiency and reuse.

One of the most significant innovations in sustainable material sourcing is the beneficial reuse of dredged material. Rather than disposing of dredged sediments offshore, ports are increasingly reusing suitable material for land reclamation, backfilling, shoreline resilience works, habitat restoration, and engineered fill. PIANC (2023) identifies beneficial use pathways including reclamation, restoration, remediation, raw material substitution, and climate resilience projects. This approach reduces dependence on imported or quarried materials while supporting circular economy objectives.

Similarly, existing port infrastructure is increasingly viewed as a source of reusable materials. Demolished concrete can be crushed and reused as aggregate, backfill, coastal protection material, or fill for port expansion works. PIANC’s guidance for small island ports (PIANC, 2026) highlights examples where recycled concrete has been reused in rock bags, shoreline raising projects, and lower-load infrastructure, reducing both environmental impacts and construction costs.

Alternative materials themselves are also becoming increasingly important. PIANC Report 105 identifies recycled plastics, fiber-reinforced polymers, and hybrid structural systems as leading alternatives to timber, steel, and concrete in marine environments. Applications include piles, quay walls, sheet piles, floating pontoons, fender systems, walkways, railings, and deck structures. These products can offer superior durability, reduced maintenance requirements, and lower lifecycle environmental impacts. In some applications, polymeric fender piles have demonstrated energy absorption capacities more than forty times greater than comparable timber piles. PIANC (2009) reports that these products can offer durability and maintenance advantages in some applications; performance depends on product, load and exposure.

Several international case studies demonstrate successful implementation of these materials, a number of which are presented in PIANC (2009).

• In Japan, long-term marine exposure testing of wood-plastic composites found excellent durability and resistance to marine borer attack (Section 8.1).
• In Italy, a glass-fiber reinforced polymer (GFRP) pedestrian bridge demonstrated the structural and durability benefits of composite materials (Section 8.2).
• Additional marine infrastructure projects in Canada, Saudi Arabia, Dubai, and South Africa have used GFRP reinforcement in concrete structures to eliminate corrosion-related deterioration and extend service life (Section 8.3 to 8.6).

Innovation is also occurring in material specification and performance optimization. Recent projects have explored treated sediments, manufactured aggregates, corrosion-resistant reinforcement, composite-reinforced concrete, and hybrid structures that combine traditional materials with advanced composites. In small island environments, designers are increasingly selecting materials based on durability, ease of maintenance, local availability, and compatibility with local maintenance capabilities. PIANC recommends prioritizing long-life, low-maintenance solutions that minimize future replacement and the need for imported materials.

Ultimately, green port material strategies are evolving from simply selecting alternative materials to adopting more sustainable sourcing practices. The emphasis is increasingly placed on reducing demand for virgin resources, reusing existing materials, incorporating recycled content, and optimizing lifecycle performance. By applying circular economy principles and prioritizing durable, low-carbon materials, ports can significantly reduce the environmental footprint of infrastructure development while enhancing resilience and long-term asset value.