BESIX has the ambition to play a leading and innovative role with regard to reducing the environmental impact of the construction sector. Within BESIX Group, BESIX and its affiliates and subsidiaries are committed to a number of reduction programmes and initiatives. Some examples are listed below.

The full list of (sector) initiatives can be found on the following link.

BESIX Group is since October 2020 a signatory of the Belgian Alliance for Climate Action, launched by the non-governmental organizations The Shift and WWF Belgium. 

The Belgian Alliance for Climate Action (BACA) is a national initiative that invites the private sector and academic institutions to take the lead on climate action and to align their activities with the objective of the Paris Agreement, i.e. to limit the rise in global temperature to a maximum of 1,5° C. 

Signatories of the Alliance express their intention to commit themselves to the Science Based Targets (SBTi) initiative and to develop and submit greenhouse gas science-based reduction targets.  

Through debates, workshops and webinars, BACA aims to increase knowledge about Science Based Targets amongst the members in order to build their business case for the adoption of science-based targets, define specific targets and develop a roadmap for their implementation.

Through the Belgian Alliance for Climate Action and The Shift, BESIX has introduced to SBTi a request to develop a more sophisticated, nuanced pathway for setting targets within the construction industry. For more info, consult the website of the BACA.

In 2016, the at that time Ministry of Infrastructure & Environment and MVO Nederland (a network of innovating companies with the aim to create a futureproof economy) took the initiative to use the Concrete Agreement to flesh out the earlier plans of the Green Deal ‘Sustainable Concrete’, which was concluded in early 2016. The objective of the Green Deal was to define a widely supported and independent definition of ‘sustainable concrete’.

The Concrete Agreement wants to takes this further and make it more tangible to the value chain partners. In July 2018 at the moment of the launch of the Concrete Agreement, Rijkswaterstaat has taken over the role of facilitator from the MVO Netwerk Beton.

The Concrete Agreement is committed to increase the sustainability of concrete within the sector and value chain. The agreement focuses on four themes: CO2 reduction, circular economy, innovation and education and natural capital. Within these four themes, the signatories to the agreement aims to improve competitiveness, increase employment, increase exports without making concessions to the quality, safety and life span of concrete.

The Concrete Agreement gives substance to the objectives and ambitions for the concrete related value chain. Here are a few examples: 30% CO2 reduction by 2030 compared to 1990 with an ambition of 49% reduction in the value chain, 100% high-quality reuse of waste concrete by 2030 and, with immediate effect, replacing at least 5% of the total volume of aggregates with concrete residual flows.

BESIX is since 2020 a signatory of the Concrete Agreement.
More information can be found in Dutch on the website of the Concrete Agreement.

3D2BGreen is a three-year 3D concrete printing research project, set up in June 2019 by BESIX, together with the start-up ResourceFull, the engineering company Witteveen+Bos and Knowledge Institute Ghent University. The research focuses on developing sustainable concrete mixtures suitable for the printing of breakwater units. The combined expertise of the project partners results in new, innovative and more sustainable solutions in hydraulic engineering.

As the major construction cost of a breakwater unit is related to the logistic resources needed to move the breakwater units from the yard to the construction site, the possibility to print it in situ, possibly even below the water level, would be very advantageous. Moreover, 3D printing would allow to define a tailor-made model breakwater unit, with more complex and optimized shapes in line with local wave patterns and sea currents. In addition, the layered surface, own to the 3D print technique, would allow for additional energy dissipation.

However, printing such massive units is a real challenge as the high binder contents currently used in printable mixtures would cause thermal cracking in addition to the drying shrinkage cracks which are related to this automated production technique. To guarantee the durability of the unit in a marine environment, the research partners want to develop a printable mixture which answers all requirements to print the contour or both the contour and the infill pattern of the breakwater unit. The environmental impact of the mixture will also be taken into account. In case only the contour is printed, a sustainable filling material will be developed. Its sustainability in the marine environment will be further increased through improvement of the interlayer. Once these challenges are tackled, scale model breakwater units will be printed to investigate their durability and mechanical and hydraulic performance.

Read here the press release of this initiative.


This project presents the design, engineering and digital fabrication strategies for a circular pedestrian bridge to be built as part of ‘De Groene Boog’ development of the A16 highway north of Rotterdam, The Netherlands.

The bridge is designed as a lightweight funicular concrete shell based on the principle of a three-hinge arch extrapolated to 3D geometry. In its realisation, it demonstrates a model of circular construction using novel material developments (such as recycled concrete) and an efficient flexible formwork system. A hybrid spline-supported 3D-knitted textile made of recycled and natural fibres that is easy and fast to assemble will be the formwork to cast the complex structural geometry needing minimal scaffolding. An in-house developed computational pipeline, based on the open-source COMPAS framework, enables the efficient design, collaborative exchange and streamlined fabrication of the bridge.

The CO2 development project, within the framework ‘Disruptive Innovations for Sustainable Concrete Construction’ is aimed to acquire expertise and to examine the possibilities of strength through geometry, computational design, use of recycled aggregates and digital fabrication in the field. The presented design and fabrication process is developed collaboratively by the Block Research Group at ETH Zurich and De Groene Boog. The ambition of the design is to provide an icon in terms of efficient design and circularity. The bridge consists of two recycled concrete grid shells using minimal reinforcement and a foundation of removable steel piles. The deck will be constructed out of reused, pressed steel panels from the construction site.

More information can be found on the website of the Block Research Group or of the A16 Rotterdam.


The COProject Plan is a sector initiative led by BESIX Nederland gathering a number of large Dutch construction companies. The COProject Plan is used on CO2-awarded projects to analyse the foreseen carbon emissions, including the scope 3 ones, of the project and to take measures to reduce these carbon emissions by, for example, applying saving energy measures, using sustainable energy, design optimisation, more sustainable materials and optimising execution and transport methodologies.

Experiences by the members of the initiative are shared publicly and form a basis for dialogue on sustainability. By sharing experiences and inspiring each other, the members of the initiative strive for a joint carbon reduction within the construction sector and its supply chain.

For more info, consult the website of the CO2 Project Plan in Dutch.

Through the Association of Belgian Contractors, a working group has been set up in Belgium with, among others, the federal and regional authorities, to promote a CO2 performance ladder in the Belgian construction industry. BESIX is a member of the working group’s steering committee.

For more info, consult the CO2 Performance Ladder website in Dutch or in French.