immo!nvest – Die Plattform für Standorte und Immobilien

Tag: Betonrecycling

  • Research project promotes the reuse of concrete in construction

    Research project promotes the reuse of concrete in construction

    The Materials and Structures Group of the Institut du patrimoine construit, d’architecture, de la construction et du territoire(inPACT) at the Haute école du paysage, d’ingénierie et d’architecture de Genève(HEPIA) is leading the Concrete Upcycling Techniques(CUT) research project. The project, led by Professor Maléna Bastien Masse, aims to integrate the reuse of concrete slabs into construction practice, as detailed in a press release. The aim is to reduce the industry’s CO2 footprint. The project is supported by the Swiss National Science Foundation(SNSF) and is being carried out in collaboration with Professor Corentin Fivet’s Structural Xploration Lab at the Swiss Federal Institute of Technology Lausanne(EPFL).

    The project aims to preserve concrete slabs during the demolition of buildings. The slabs are sawn up on site and then analysed by HEPIA researchers. The aim is to find out whether these slabs can be reused. The panels approved for reuse are then used in new buildings. The project is also investigating how they can be joined together during reuse. Advanced techniques and materials such as high-performance fibre-reinforced cementitious composite (CFUP) will be used.

    “The construction industry loves concrete. It is an indispensable, versatile, adaptable and cost-effective material, but it is also extremely harmful to the environment. One solution is obvious: reuse,” reads the press release. “By recovering and reusing components from existing buildings for new construction projects, concrete consumption is reduced, resulting in a lower CO2 footprint.”

    HEPIA is a Geneva-based university that specialises in education and research in the fields of engineering, architecture and the environment, particularly in the areas of materials and sustainable construction. The university is part of the University of Applied Sciences Western Switzerland(HES-SO).

  • New partnership promotes permanent carbon removal

    New partnership promotes permanent carbon removal

    The Bern-based ClimateTech company Neustark has been awarded a multi-year contract for CO2 removal (CDR) by Swiss International Air Lines (Swiss), according to a press release. For the first time, a representative of the aviation and construction industries are joining forces to work together to permanently reduce carbon emissions, the press release continues. Both sectors are considered high-emission industries that are difficult to decarbonise, according to Valentin Gutknecht, co-founder and co-CEO of Neustark.

    For the start-up, which was founded as a spin-off from the Swiss Federal Institute of Technology in Zurich (ETH) in 2019, the partnership paves the way for a Europe-wide expansion of carbon capture, storage and removal technology. “Pioneers like Swiss play a crucial role in the further expansion of our CO2 removal technology, enabling us to permanently remove exponentially more tonnes of hard-to-avoid CO2 emissions from the atmosphere every day,” Gutknecht is quoted as saying.

    Neustark’s solution is based on the reutilisation of concrete from demolished buildings and mineral waste materials. The technology triggers an accelerated mineralisation process in which CO2 is bound to the pores and surface of the granulate and thus permanently removed from the air. The demolition granulate can then be reused in carbonised form in the construction of roads or for the production of recycled concrete.

    The partnership was concluded with the option of extending the volume and duration and is part of a long-term initiative to remove CO2 from Swiss. The airline, which is part of the Lufthansa Group, already has partnerships with Swiss climate technology companies such as Climeworks and Synhelion, according to the statement: “The permanent removal of CO2 is an important building block on the way to net zero in aviation. Together, we are taking an important step towards scaling this technology,” CEO Jens Fehlinger is quoted as saying.

  • 10 million Swiss francs in funding for concrete recycling technology

    10 million Swiss francs in funding for concrete recycling technology

    Almost 40% of global CO2 emissions are attributable to the construction and building sector. Around 30 billion tonnes of concrete are produced worldwide every year and demand continues to rise. The binding agent cement and the composite material concrete are important building materials – but their production contributes to climate change. Estimates suggest that the cement industry alone is responsible for more than 8% of global greenhouse gas emissions. With reCO2ver® Sika has developed an innovative technology that enables complete recycling of concrete demolition material and is unique in the concrete industry.

    17,000 tonnes of CO2 storage in concrete demolition material by the end of 2030

    Sikas not only processes old concrete into the high-quality individual components gravel, sand and cement stone, but can also bind additional CO2 thanks to a chemical process. Approximately 15 kilogrammes of CO2 can be permanently stored per tonne of demolition material. In addition, the performance of the cement paste powder produced in the process is optimised by Sika additives

    Additives and can thus be used again as a cement substitute in concrete production. A pilot plant has been in operation in Switzerland since October 2021 – the test phase has now been successfully completed.

    In order to be able to provide standardised proof of the plants’ added climate value, Sika is developing a climate protection programme together with South Pole in accordance with the specifications of the Swiss Federal Office for the Environment (BAFU). A significant milestone has now been reached with regard to the implementation and use of this technology for CO2 capture and storage: the Swiss Climate Cent Foundation guarantees the purchase of CO2 certificates from this programme of initially CHF 10 million until the end of 2030.

    The implementation of the industrial plants is a central component of the certified climate protection programme. By the end of 2030, around 17,000 tonnes of CO2 are to be stored in concrete demolition material. This is roughly equivalent to the amount of CO2 released during the construction of 850 single-family houses made of concrete. Philippe Jost, Head Construction Sika: “With our innovative strength and our sustainable technologies, we enable our customers in the construction and automotive industries to reduce their ecological footprint and make the transition to more sustainability. We are very pleased that the reCO2ver® technology is being specifically promoted. We are convinced that through the programme we are creating great added value for the construction industry, the environment and for future generations.”