A “circular” construction sector: circular economy in construction waste management.

October 30, 2025

Caring for what we have and giving it a new life — that’s the mantra behind the GREENMUR project, which has shaped its waste management solutions for the construction sector around the principles of the circular economy, the model that will make this industry truly sustainable.

Through its waste management innovations, GREENMUR aims to accelerate the adoption of a circular economy model that prioritizes the responsible use of resources and their reuse — extending their lifespan in a context where reduction, reuse, and recycling are essential to prevent the collapse of current production systems and to transform them instead.

The project’s sustainable solutions are based on Additive Manufacturing of construction elements using micro-concretes made from a mixture of limestone, gypsum, and fiberglass waste.

GREENMUR offers an effective approach capable of turning waste into raw materials. The project, coordinated by Polymec, GLS 2014, and Yesos Rubio, in collaboration with the Technological Centre for Marble, Stone and Materials, has received financial support from the Development Institute of the Region of Murcia (INFO) and the European Regional Development Fund (ERDF).

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Polymec, committed to the environment.

At Polymec, we are committed to protecting the environment. That’s why we carry out initiatives aimed at promoting energy efficiency and the use of renewable energy sources, strengthening a sustainable and high-quality model within our facilities.

As part of this effort, we have renewed our lighting systems with LED technology and installed a new compressor, achieving an annual reduction of 30 tons of CO₂ emissions into the atmosphere.

This initiative has been co-financed by the European Regional Development Fund (ERDF) and the Region of Murcia.

Total investment: €21,945.42
Total grant awarded: €9,047.20
ERDF contribution: €7,237.76

Objective: To advance in the assessment and improvement of energy efficiency in companies, particularly SMEs, and to achieve a cleaner and more sustainable economy.

Greenmur en

Among the technological challenges posed by the materials used in the construction sector, one of the most notable is the need for continuous innovation to achieve products with greater added value — featuring new designs and improved properties — while remaining aligned with a sustainable development model that reduces resource consumption and waste generation. In this regard, the circular economy represents a major opportunity from a business, social, and environmental standpoint.

In this context, Polymec, GLS 2014, and Yesos Rubio, in collaboration with the Technological Centre for Marble, Stone and Materials, have launched the project GREENMUR – Transition to a Greener Regional Industry through Circular Economy Processes in the Fiberglass, Marble, and Plaster Sector via Additive Manufacturing. The initiative incorporates Additive Manufacturing technology to process marble sludge and plaster waste, reinforcing them with fiberglass residues to produce new commercial prefabricated products.

The project will help reduce the consumption of mineral resources in the construction sector, minimize waste generation, and manufacture new products using Industry 4.0 technologies such as Additive Manufacturing, generating significant environmental, social, and economic benefits.

The project has been funded through the R&D Challenges Program of the Region of Murcia and has received financial support from the Development Institute of the Region of Murcia (INFO) and the European Regional Development Fund (ERDF).

The RECOTRANS project achieves its first demonstrators thanks to a new microwave-based manufacturing process and lightweight multi-materials designed to produce more sustainable vehicles.

In Europe, transport accounts for nearly a quarter of all greenhouse gas emissions. One of the key strategies to combat this environmental impact is to reduce vehicle weight, which not only lowers fuel consumption but also improves performance, decreases the load on suspension and braking systems, and supports the development of electric vehicles, where range remains a major challenge.

RECOTRANS Project

POLYMEC is participating in the RECOTRANS project, whose goal is to develop technologies and design solutions that reduce vehicle weight without increasing costs. To achieve this, the project is developing multi-material thermoplastic components that both reduce part weight and allow for more complex designs. It also incorporates microwave curing in the manufacturing process to shorten production times and lower energy consumption, as well as metal–polymer hybrid welding to reduce raw material use and improve process standardization and automation. All of this is supported by an intelligent production line monitoring system.

The outcome of this innovative system will be the development of three demonstrators in the automotive, truck, and railway sectors: a car door, a truck cab rear suspension, and an interior panel for a train carriage. Early results from the project show that, after producing the first prototypes, there has been a significant reduction in both costs and energy consumption compared to conventional composites, as well as a viable path toward recycling and reprocessing recycled thermoplastic composites.

The RECOTRANS project, which began in October 2017 and will conclude in October 2021, is funded by the European Union under the Horizon 2020 program, and involves 13 partners from seven different countries. The developments achieved through this project will also be applicable to other industries.