immo!nvest – Die Plattform für Standorte und Immobilien

Tag: Zement

  • Cement revolution thanks to mother-of-pearl structure

    Cement revolution thanks to mother-of-pearl structure

    Unlike glass, wood and steel, cement is naturally brittle and not very flexible without reinforcements. This considerably limits its possible uses in load-bearing structures. Although there are already methods for improving the fracture toughness and ductility of cement, for example through polymer, glass or metal reinforcements, these only slightly increase energy absorption and fracture resistance.

    A composite material modelled on mother-of-pearl
    The Princeton University team found that alternating layers of thin polymer and patterned cement paste increase ductility. The composite material developed mimics the structure of mother-of-pearl, a substance found in certain shells and known for its strength and flexibility. Mother-of-pearl consists of over 95% calcium carbonate and up to 5% organic material. This unique combination gives mother-of-pearl its remarkable mechanical resistance.

    Mechanisms of the mother-of-pearl structure
    Mother-of-pearl is a biomineral consisting of aragonite platelets connected by a soft biopolymer. This 3D brick mortar structure allows the platelets to slide and deform, absorbing energy and increasing toughness. This synergy between the hard and soft components is crucial for the remarkable mechanical properties of nacre.

    Applying the principles to cement composites
    The Princeton University researchers used conventional building materials such as Portland cement and polymers to develop a similar composite. They layered cement paste boards with polyvinyl siloxane, a flexible polymer, to create multi-layered beams. These were tested for crack resistance in a notched three-point bending test. The results showed that these composites achieved 17 times higher fracture toughness and 1791 per cent higher ductility compared to solid cement.

    Future prospects and optimisation
    The researchers plan to explore different soft materials for more resistant infrastructures and to optimise the groove shapes for better defect integration. In addition, production methods are to be further developed using integrated lamination laser processes or additive manufacturing. These advances could revolutionise the construction industry and significantly expand the use of cement in load-bearing structures.

    The newly developed cement composite, inspired by the structure of mother-of-pearl, offers a promising solution for improving the mechanical properties of cement. With its exceptional crack resistance and ductility, this composite represents a significant innovation that has the potential to transform the construction industry.

  • JURA ECO3 – the visibly sustainable cement

    JURA ECO3 – the visibly sustainable cement

    Clinker is the most important component of cement and consists of ground limestone and marl, which is fired at 1450° Celsius. The carbon from the limestone is released into the atmosphere during the burning process. This accounts for around two thirds of CO2 emissions per tonne of clinker. Some cement manufacturers replace clinker with granulated blast furnace slag or fly ash in order to reduce CO2 emissions. However, these materials are available in reduced quantities or have to be imported.

    “In our latest cement JURA ECO3, we are replacing a significant proportion of the clinker with clay,” explains Emanuel Meyer, Head of the Technical Competence Centre TCC of the JURA Materials Group. “Clay is fired at half the temperature of clinker and generates two thirds less CO2 emissions. We extract the clay from our own clay pit. JURA ECO3 cement also contains the least grey energy compared to all other Swiss cements. If a concrete is produced with JURA ECO3 cement, the total CO2 emissions per m3 of concrete are approx. 20 % lower compared to building construction concretes with Portland limestone cement.“

    Certified and tested
    JURA ECO3 is the only CEM II/C-M (Q-LL) cement approved in Switzerland with strength class 42.5 N, externally tested and certified in accordance with
    SN EN 197-5. It is approved for building construction (concrete types A-C). “The product meets the growing demand for sustainable solutions,” explains Ralf Schumann, Commercial Director Cement of the JURA Materials Group, “whether from architects or investors such as cities and municipalities, pension funds and insurance companies, for whom the carbon footprint of a construction project is playing an increasingly important role. Thanks to JURA ECO3, they can significantly improve this.”

    JURA ECO3 cement is certified by ecobau as an eco1 product. It is suitable for Minergie (A-/P-)-ECO projects and fulfils the 1st priority ecoBKP/ecoDevis. With its warm earthy colour, it also sets a visual example for sustainable construction. The JURA ECO3 cement will soon be available in the KBOB* calculator. This can be used to calculate the environmental impact of one m³ of concrete of your choice.

    *KBOB = Coordination Conference of the Construction and Property Bodies of Public Building Owners

    In addition to a small CO2 footprint, concrete made from JURA ECO3 cement with calcined clay has a warmer colour and also sets a visual example for sustainable construction. ECAP construction site, Couvet (zVG)

  • Ecocycle technology from Holcim receives award

    Ecocycle technology from Holcim receives award

    Holcim’s Ecocycle technology has been named a “beacon of the circular economy in the built environment”, according to a press release. This was announced as part of a joint initiative by the consulting firm McKinsey & Company and the World Economic Forum at its annual meeting in Davos. The award recognises pioneering solutions that demonstrate a novel, unique approach to the circular economy, proven and substantial impact of high value, and significant scale and maturity.

    Holcim already operates over 100 of its Ecocycle recycling centres. According to their own figures, they recycled almost 7 million tonnes of construction waste into new building solutions in 2022. This corresponds to over 1,000 lorry loads per day. This network is to be expanded to 150 locations by 2030. In Europe alone, the Group plans to recycle over 20 million tonnes of construction waste. Ecocycle makes it possible for concrete, cement and aggregates to contain between 10 and 100 per cent recycled demolition materials without compromising on performance.

    “With our advanced recycling of demolition materials, we can already reduce the carbon footprint of cement by up to 40 per cent,” Holcim’s Head of Sustainability Nollaig Forrest is quoted as saying. “This is just the beginning. With our innovations and partnerships along the entire value chain to further develop building standards, we want to accelerate the transition to circular construction in all the urban centres in which we operate.”

  • Materials researchers work on climate-friendly concrete

    Materials researchers work on climate-friendly concrete

    A group of materials researchers led by Franco Zunino from the Institute of Building Materials at the Swiss Federal Institute of Technology Zurich is researching compositions for concrete that can significantly reduce its CO2 emissions. The world’s most important building material is responsible for up to 9 percent of man-made CO2 emissions, the Swiss National Science Foundation(SNSF) informs in a press release. It is supporting the research with an Ambizione grant for Zunino.

    The researchers are using two approaches to develop a climate-friendly concrete. The first is to reduce the particularly CO2-intensive cement content of concrete by 60 to 70 per cent. To achieve this, new types of chemical additives are used, in particular so-called polymer dispersants. In the second approach, the use of binders is reduced.

    In its research, the group is “working closely with a major cement manufacturer”, explains the SNSF. An alternative to concrete is unrealistic, according to Zunino. It would take “a forest the size of India” to replace concrete with wood. Even a completely new building material would hardly be able to establish itself “on the streets in Nigeria, where concrete is perhaps mixed together with bare hands”. With a climate-friendly concrete that is suitable for everyday use, however, “the industry would have a solution in hand to implement its CO2 targets and save CO2 taxes”.

  • Empa is researching climate-friendly concrete

    Empa is researching climate-friendly concrete

    The Swiss National Science Foundation ( SNSF ) is funding a five-year project by the Swiss Federal Laboratories for Materials Testing and Research ( Empa ) to research CO2 binding in cement. As part of the SNSF Advanced Grant, the scientists working with project manager Barbara Lothenbach will receive 2.2 million francs for their research project, according to a press release .

    The grant replaces funds from the European Research Council of the European Commission , to which Swiss researchers currently have no access.

    With the help of the funding, the Empa experts will carry out basic research in the field of CO2 binding in cement together with partners from the Finnish University of Oulu.

    The background to the project called Low Carbon Magnesium-Based Binders is that the cement industry releases large amounts of carbon dioxide. At the same time, concrete is considered a beacon of hope for binding CO2 and thus as a potential reducer of climate-damaging greenhouse gases if it is based on magnesium and not on lime as is usually the case.

    Starting in 2023, the researchers will find out how stable magnesium concrete is in the long term, how it can best be produced on construction sites and how temperature, pH value and other factors affect the molecular level.

  • Holcim buys Belgian building materials specialist Cantillana

    Holcim buys Belgian building materials specialist Cantillana

    Building materials producer Holcim has announced the takeover of Belgian building materials dealer Cantillana . With Cantillana’s presence and portfolio, Holcim can advance the expansion of the solutions and products division, which is expected to account for 30 percent of Group net sales by 2025, according to a press release .

    For Holcim, the decision in favor of the provider of special solutions means a further optimization of its market position in facade construction systems and thermal insulation composite systems. “This expansion further strengthens our presence in Europe, particularly in the area of building renovation and energy efficiency,” said Miljan Gutovic, head of Holcim’s Europe, Middle East and Africa region.

    The investment ties in with the adopted strategy of “green growth”. Both companies announce that they aim to “take a bigger role in providing innovative and sustainable solutions for energy-efficient buildings”.

    After acquiring the French PRB Group , the Belgian PTB-Compaktuna and Izolbet in Poland, Holcim is adding Cantillana, a privately held company, to the “Holcim family”. Originating as a branch of a construction company, Cantillana has specialized since it was founded in 1875 in the sale of and trade in building materials and building material accessories for the construction and related trades. Today, Cantillana is part of the Stadsbader Group and employs more than 200 people at nine production sites in Belgium, France, Germany and the Netherlands.

    Holcim AG has focused on innovative and sustainable construction solutions in building construction, civil engineering and infrastructure. At 55 locations across Switzerland, the company produces concrete, gravel and cement suitable for all construction projects and recycles demolition materials into resource-saving products.

  • Synhelion and Cemex produce the first solar concrete

    Synhelion and Cemex produce the first solar concrete

    Synhelion and Mexico’s Cemex , the world’s fifth largest cement producer in 2020, have produced the world’s first solar clinker. As both companies write in a media release of the same name, this “revolutionary innovation” is a “first step towards the development of completely solar-powered cement plants”. dr Gianluca Ambrosetti, CEO and co-founder of Synhelion, is proud to “join with Cemex to demonstrate a concrete, industrially relevant application of our fully renewable high-temperature solar heating”.

    Synhelion emerged from the Swiss Federal Institute of Technology in Zurich in 2016. The company’s technology aims to replace all types of fossil fuels with solar fuels. According to the information, it converts concentrated heat from the sun into “the hottest process heat available on the market”. Cemex wants to supply CO2-neutral concrete worldwide by 2050. A key part of this strategy is CEMEX Ventures and its research and development center in Brügg BE.

    Research teams from both companies installed a pilot plant on the premises of the Madrid Regional Government’s Imdea Energy Research Institute . There, the solar receiver from Synhelion delivered “record-breaking” temperatures of over 1500 degrees with concentrated sunlight. A gaseous heat transfer medium is thus heated. This provided the heat needed to melt limestone, clay, and other materials together.

    The clinker obtained in this way was used to manufacture cement and then processed into concrete. In the next phase of their joint research and development project, Synhelion and Cemex intend to work towards an industrial-scale pilot plant.

  • Holcim sells stores in Brazil

    Holcim sells stores in Brazil

    Holcim is selling its businesses in Brazil. As announced by the company, the company is valued at $ 1.025 billion. It comprises five cement plants, four grinding plants, six plants for aggregates and 19 ready-mixed concrete plants. The buyer is the Companhia Siderúrgica Nacional. "This sale is a further step in our transformation into the world's leading provider of innovative and sustainable building solutions," Holcim CEO Jan Jenisch is quoted as saying. "It gives us the flexibility to invest in attractive growth opportunities."

    With this sale, the company's balance sheet will be strengthened and the level of indebtedness will be significantly reduced, according to Holcim. It took place as part of an optimization of the portfolio. The proceeds will be used for investments in the Solutions & Products division. This builds on the acquisition of Firestone Building Products , an American manufacturer of flat roof systems, at the beginning of January. This transaction was valued at $ 3.4 billion. As a first step, Holcim introduced the Firestone GacoFlex line for waterproofing roofs in Mexico.

    Despite the sale of the Brazilian business, Latin America remains a key strategic growth region for Holcim. The group recently invested in an additional clinker plant in Malagueño, Argentina, and in a new grinding plant in Yucatán, Mexico. In addition, the expansion of the company's own retail network in Disensa is ongoing.

  • Drone conducts measurement flights in cement works

    Drone conducts measurement flights in cement works

    An important milestone was reached this week at the Holcim cement plant in Siggenthal. After several years of research, the special drone from the Zurich start-up Voliro carried out its first official measurement flight campaign there. According to a press release, important measurements were taken to determine the steel wall thicknesses of the cement kiln and the cyclone preheater.

    Voliro, a spin-off from the Swiss Federal Institute of Technology Zurich ( ETH ), specializes in the development of flying robots for the inspection and maintenance of industrial plants. Your drones can be equipped with different sensors and carry out visual as well as thermal and contact-based measurements. A special feature of the drones is that they can rotate around all axes thanks to a special rotor system, which allows them to maneuver in vertical positions and even upside down. Thanks to the 360-degree design, they are also suitable for use when taking measurements on curved and inclined surfaces.

    According to the press release, the use of such special drones at great heights is considered a world first. The method saved both time and money. The use of drones also increases work safety.

    According to the information, Holcim has been accompanying Voliro's product development since 2019. The global cement company from Zug is making its infrastructure in Siggenthal available to the start-up for test flights and supporting it with its specialist knowledge.

  • Holcim launches CO2-reduced cement

    Holcim launches CO2-reduced cement

    With ECOPlanet, Holcim is bringing a green cement onto the market. According to a press release by the company, this causes 30 percent less CO2 emissions than conventional products. According to CEO Jan Jenisch, this will be the world's first cement that consists of 20 percent recycled construction and demolition waste. In addition to the use of low-emission raw materials, the CO2 reduction is achieved, among other things, by decarbonising the production process.

    ECOPlanet is already available in Switzerland as well as in Germany, Romania, Canada, Spain, France and Italy. In the current year, the product is to be launched in a total of 15 European countries. Holcim plans to double its market presence with ECOPlanet by the end of 2022.

    "In view of the increasing world population and rapid urbanization, solutions like ECOPlanet are of crucial importance to create greener cities and smarter infrastructure and to build more with less effort," Jenisch is quoted in the press release.

  • Sika supports the introduction of Swiss eco-cement

    Sika supports the introduction of Swiss eco-cement

    LC3 stands for Limestone Calcined Clay Cement and was developed by the Swiss Federal Institute of Technology in Lausanne ( EPFL ). It is a sustainable cement product that has a clinker content that is up to 50 percent lower than that of traditional cement. Clinker makes a significant contribution to CO2 emissions during cement production. In LC3, a large proportion of clinker is replaced with a new additive, which means that overall less CO2 is emitted in cement production.

    The Zug-based construction chemicals group Sika wants to support the market launch of LC3, as he writes in a press release. He wants to develop and offer special cement additives and concrete admixtures that help customers adapt their materials to the properties of LC3. This should enable the water consumption, workability, hardening and durability of the LC3 concrete to remain the same compared to conventional products. According to its own statements, Sika is also ready for “comprehensive product tests with interested customers”.

    "With these new LC3 products, we are putting the goals of our sustainability strategy into practice," said Frank Höfflin, Sika's head of technology, in the press release. “Our aim is to act as an enabler for sustainability in the construction industry and to develop more environmentally friendly and more efficient products,” he emphasizes.

  • Controversial quarries slow down cement production

    Controversial quarries slow down cement production

    Around 5 million tons of cement are used annually in construction and infrastructure projects in Switzerland. In 2019, 86 percent of demand was met by Swiss cement plants. The raw materials lime and marl, which are used in the cement industry, are available in Switzerland.

    However, a report that the Federal Council has taken note of assumes that cement production in Switzerland is likely to decline in the coming years. The reason for this is resistance to the expansion or reopening of quarries. If the requested mining expansion projects for the raw materials lime and marl set out in the cantonal structure plans are not approved, Switzerland's supply of domestic cement will fall to 64 percent by 2024, according to the report.

    The report therefore proposes that raw material deposits that are important for the production of cement should also be considered from a national supply point of view. Currently, the authority for the approval of dismantling projects lies with the municipalities and cantons. The aim is to create a national overview of the raw material deposits and to evaluate it from a “raw material geological point of view”. This would give authorities and raw material producers a basis when planning mining projects.

    In its communication, the Federal Council also emphasizes that the Federal Office for the Environment ( FOEN ) is currently working with research and industry to find new solutions to replace the primary raw materials lime and marl with secondary raw materials. So far, however, this has only been possible to a very limited extent. However, technologies are also in the development phase that will replace cement in concrete or even lead to cement-free concrete.