Infrastructure management has evolved from being a matter of balancing functionality and cost to becoming an exercise in technical precision driven by mandatory environmental compliance. Today, the viability of a project is also inevitably measured by its ability to comply with a regulatory and financial framework that already requires quantifiable environmental sustainability as an immediate implementation requirement.

In today’s market, compliance with road safety standards is only the first step. The EU Taxonomy Regulation and the guidelines of the European Green Deal operate as binding technical regulations that determine the eligibility of suppliers within the sector. For manufacturers of metal infrastructure equipment, this translates into an operational obligation: full traceability. Products are no longer assessed solely on their physical durability, but also on their emissions balance, from raw material extraction through to the end of their life cycle.

This scenario has transformed sustainability into a fundamental technical specification. In high-level procurement processes, transparency in emissions data has become a decisive qualifying factor. The ability to certify environmental impact with scientific rigour is now the minimum level of technical capability required to operate within the industry.

1. Environmental Product Declaration (EPD)

Within the complex ecosystem of sustainable infrastructure, the Environmental Product Declaration (EPD) has become the definitive benchmark for transparency and the only “environmental passport” with recognised technical validity. While the market is often saturated with ambiguous green marketing claims (greenwashing), the EPD introduces a rigorous quantification methodology based on the international standards ISO 14025 and, specifically for the construction sector, EN 15804.
The relevance of the EPD for the specifier and the end client lies in three fundamental pillars:

  1. Scientific rigour and neutrality: Unlike a self-declaration, the EPD is not a value judgement on whether a product is “good” or “bad”. It is a detailed inventory of environmental impacts based on objective data, verified by an independent third party. This external audit guarantees data integrity for public bodies and funding institutions.
  2. Objective comparability: The EPD standardises the Product Category Rules (PCR), allowing engineers, architects and specifiers to compare technical solutions from different manufacturers under the same functional unit and identical impact parameters. This turns sustainability into a variable as measurable and comparable as tensile strength or yield strength.
  3. Modular transparency: The document breaks down the impact into different stages, making it possible to identify at which point in the value chain the greatest footprint is generated. This granularity is essential for global impact calculations of large infrastructures, where the sum of individual EPDs for each component (barriers, posts, structures) forms the overall environmental profile of the works.

2. Life Cycle Assessment (LCA) as a central metric

The EPD is the final expression of an exhaustive Life Cycle Assessment (LCA) process. This analysis breaks down the environmental impact of the product across its entire continuous cycle, structured into standardised technical modules according to EN 15804, allowing a rigorous assessment from initial extraction through to reintegration into the circular economy:

2.1 Product stage

  • Raw material supply (Module A1): Quantifies the impact of extraction, mining and initial processing of metals and basic resources.
  • Transport to manufacturing plant (Module A2): Measures the logistics footprint of inputs from their origin to processing and manufacturing facilities.
  • Manufacturing (Module A3): Precisely assesses electricity consumption, gaseous fuels, water resources and waste management generated during the product manufacturing process.

2.2 Construction process stage

  • Transport of the product to site (Module A4): Records the logistical impact of transporting finished structures and equipment from the manufacturing plant to the final infrastructure project location.
  • Installation and assembly process (Module A5): Includes energy consumption, machinery used, auxiliary materials and waste management generated during the installation and integration of the product into the works.

2.3 Use and Maintenance Stage

  • Maintenance and repair (Modules B1 to B7): Assesses the impacts arising from the activities required to preserve the product’s technical performance throughout its service life. In the case of the steel–hot-dip galvanised combination, this module stands out for its minimal environmental footprint, as the metallurgical protection eliminates the need for repainting or periodic corrective maintenance, optimising the infrastructure’s environmental OPEX.

2.4 End-of-Life Stage

  • Deconstruction and demolition (Module C1): Measures the resources and emissions associated with the dismantling and safe removal of the material once it has reached the end of its service life.
  • Transport to waste management facilities (Module C2): Quantifies the logistics involved in transporting the removed material to treatment or recycling facilities.
  • Processing and disposal (Modules C3 and C4): Analyses the final destination of the waste and the mechanical or thermal processes required for its separation and treatment.

2.5 Benefits and Loads Beyond the Life Cycle

  • Recovery, recycling and reuse potential (Module D): This module lies at the heart of the circular economy. It quantifies the net environmental benefits provided by the product at the end of its service life by replacing the need to produce virgin raw materials. For steel structures, this value is exceptionally positive due to steel’s inherent ability to be recycled indefinitely at a rate of 100% without losing any of its structural mechanical properties.

The LCA provides a multidimensional perspective that goes beyond the simple measurement of Global Warming Potential (GWP). It reports critical indicators such as soil and water acidification, depletion of abiotic resources and eutrophication, enabling comprehensive environmental risk management while providing transparent and easily auditable traceability for specifiers and public authorities.

Requirements for Green Public Procurement (GPP)

The rollout of Green Public Procurement has turned the manufacturer’s EPD into a technical barrier to market entry. Public authorities no longer accept generic “industry average” data, instead requiring product-specific information that provides:

  1. Project accuracy: It enables designers and engineers to calculate the actual carbon footprint of a project by combining the precise data for each component, avoiding penalties resulting from environmental performance deviations.
  2. Supply assurance: It guarantees that the material delivered on site fully matches the certification submitted during the tendering process.
  3. Competitive advantage in European funding: In projects supported by NextGenerationEU funding, a manufacturer-specific EPD is often a technical qualification requirement that gives suppliers a competitive advantage over competitors competing solely on price.

3. The Steel–Hot-Dip Galvanising Combination

As the majority of the equipment manufactured by Metalesa is produced using steel and the hot-dip galvanising process, the following section examines how this material and manufacturing process contribute to the durability and circularity of these products, and consequently to the product’s final EPD.

3.1 Steel in the Circular Economy

Steel is a permanent material that can be fully recovered and recycled without any degradation of its mechanical properties. The use of recycled steel can reduce CO2 emissions by up to 85% compared with primary steel production, supporting the sector’s decarbonisation objectives.

3.2 Protection through Hot-Dip Galvanising (ISO 1461)

Durability is a technical requirement for preventing the premature depletion of resources. The hot-dip galvanising process, in accordance with UNE-EN ISO 1461, ensures long service life through:

  • Metallurgical reaction: It creates zinc–iron alloy layers that are metallurgically bonded to the steel substrate, rather than forming a simple surface coating.
  • OPEX optimisation: A galvanised structure eliminates the need for subsequent maintenance interventions, reducing operating costs and the environmental impact associated with repair works on site.

Ultimately, the implementation of EPDs and LCAs defines the current regulatory landscape of the market. The industry no longer operates on the premise that sustainability is an added value, but rather as a mandatory compliance protocol that is essential for the technical, commercial and legal viability of any infrastructure project.