Displaying items by tag: CO2

UK: Holcim subsidiary Aggregate Industries has commenced its construction of a cement blending plant and import hub on the River Thames at the Port of Tilbury in Essex. The facility also includes units for the production of reduced-CO₂ cement components, including ground granulated blast furnace slag (GGBFS) and construction demolition waste (CDW)-based materials. The Tilbury site has five loading heads and will help Aggregate Industries to maintain its continuous supply of conventional, reduced-CO₂ and circular cementitious materials to London and South East England.

CEO Dragan Maksimovic said “This important investment will further strengthen our position in the market, allowing us to drive our sustainability ambitions and lead the way in low carbon and circular building materials. The London and South East construction market has major regional projects on the horizon, and we are primed and ready to meet the region’s rising demand for sustainable solutions.”

Steve Curley, managing director cement, added “Our ECOPlanet range of green cement was recently added to our green offering. By investing in this impressive facility within the Port of Tilbury, we will truly boost our sustainable offering and be more agile and efficient in the way we manufacture, transport and supply our products across this region.”

UK: CCP Building Products has been working with Carbon8 to develop cement-free, carbon negative concrete blocks. The blocks will be produced using parent company SigmaRoc’s Greenbloc technology with Carbon8’s carbon negative aggregates. The approach is based upon reducing the cement content in concrete and CCP has developed a process that uses ground granulated blast-furnace slag (GGBS) as the main raw ingredient. Carbon8’s technology captures and stores more CO₂ in the aggregates than is released in the manufacturing process, resulting in a carbon negative block.

CCP and Carbon8 announced in July 2023 that the first trials of the project had been successful. Ian St Hillaire, the Technology & Innovation Director for SigmaRoc, said “We set about producing trial samples of concrete blocks at site production scale to push the boundaries of possible. This led to some exciting developments in our Greenbloc technology using Carbon8 carbon-negative aggregate. Combining the alternative aggregate with cement-free technology in the right proportions allows us to successfully produce a concrete block that is not only ultra-low in carbon embodiment, but is actually carbon negative.”

CCP are planning to move on to larger plant trials and then start producing environmental product declarations (EPDs) to verify the new product’s carbon negative claims.

EU/UK: EUROSLAG says that the use of ground granulated blast furnace slag (GGBFS) in cement production in the EU and UK between 2000 and 2022 has generated a cumulative reduction in CO₂ emissions of 408Mt. GGBFS replaced 716Mt-worth of raw materials over the period.

EUROSLAG Chair Thomas Reiche said "Resource conservation through secondary raw materials, especially in the construction sector, and lower emissions of climate-damaging CO₂, are of outstanding ecological and economic importance. The use of ferrous slags makes an important contribution to this. EUROSLAG is working multilaterally to master the enormous challenges in the coming years, above all the transformation of the steel industry, through research and adjustments to national and European regulations.”

Germany: The FEhS Building Materials Institute recorded total German granulated blast furnace slag (GBFS) production of 7Mt in 2022. The institute said that cumulative German GBFS production over the 70 years up to 2022 was 227Mt. It said that, if used in cement production, this would be able to replace 398Mt of limestone and eliminate 227Mt of CO₂ emissions.

Denmark: Finland-based Betolar has supplied its Geoprime additive for its maiden construction project in Denmark. Its customer IBF used the additive to produce low-cement paving stones for a 1.5 hectare expansion to the lorry park at the Port of Aalborg. The stones consisted of an 84mm-thick cement-free base made of Geoprime material, with a 6mm-thick cement-based concrete top. The supplier said that the use of Geoprime reduced the project's cement consumption by 90%. This more than halved the carbon footprint of the work.

Betolar's chief commercial officer Ville Voipio said "This shows that the circular economy solution we have developed, which utilises industrial side streams, also works in large construction projects. We have been doing development work with IBF for a long time. Now there is a product on the Danish market that radically cuts emissions compared to traditional products."

Denmark is committed to eliminating 70% of its annual CO₂ emissions between 2020 and 2030.

Finland: Betolar has signed a cooperation agreement with concrete producer Consolis Parma to develop reduced-CO₂ hollow concrete slabs. The development process will implement Betolar's Geoprime binder into Consolis Parma's concrete production. Consolis Parma is committed to halving its CO₂ emissions between 2021 and 2035.

Consolis Parma's Technology Director Juha Rämö said “The use of alternative new binder combinations and additives that ensure the efficiency of the manufacturing process are key factors in achieving our climate goals. We are actively seeking new channels to address these challenges. The cooperation with Betolar is an important new partnership for us."

Germany: Building materials research institute FEhS-Institute says that cement producers used 7.9Mt of German ground granulated blast furnace slag (GGBFS) in cement production in 2022. This corresponds to 71% of the 11.1Mt of slag produced by the domestic iron and steel industries during the year. Other applications for the slag included aggregates production (3.1Mt - 28%) and internal recycling at the refinery (500,000t - 4.5%).

Managing director Thomas Reiche said "Unlike recycled materials, iron mill slags are already high-quality and climate-friendly secondary raw materials in their 'first life.' For decades they have made an important contribution to a sustainable recycling economy in Germany. To ensure that this can continue in the future after the transformation of the steel industry, we have been researching new slags together with our partners since 2013 - for example, with the Direct Reduction Of Iron Ore Electric Furnace Slag and Save CO2 projects to develop Blast Furnace Slag 2.0."

France: Cemex France and Ecocem have signed a deal to collaborate on the development of reduced-CO₂ concrete development at 10 Cemex France ready-mix concrete batching plants. The partnership will explore methods that include the use of supplementary cementitious materials in place of clinker. Cemex hopes that the collaboration will help to realise its goal of a 55% CO₂ emissions reduction across its European operations by 2030.

Cemex Western Europe vice president materials and Cemex France president Michel Andre said “Cemex continues to reinforce its commitment to advancing the sustainability agenda with the announcement of this extended partnership with Ecocem. We know that if we are to achieve our global ambition of operating as a net-zero business by 2050 we must prioritise exploring innovation and new technologies with like-minded companies who share our dedication to leading the industry’s transition to a lower carbon and circular economy.”

UK: Contractors poured 736m³ of cement-free concrete in an 11-hour continuous pour at the Hurst substation tunnel drive shaft of the London Power Tunnels project on 11 May 2023. Construction Index News has reported that Capital Concrete supplied the concrete. It uses a formula developed by Earth Friendly Concrete to replace 100% of cement with fly ash and ground granulated blast furnace slag (GGBFS) in the presence of an activator and admix solution. The supplier said that the concrete will reduce CO₂ emissions by 64% compared with ordinary Portland cement (OPC), corresponding to 111kg/m³ of concrete.

France: Hoffmann Green Cement Technologies has commissioned its H2 plant, a 1000t/day clinker-free cement plant, adjacent to its existing H1 clinker-free cement plant in Bournezeau, Pays de la Loire. L'Usine Nouvelle News has reported that the new plant took 24 months to build and cost Euro22m. The main part of the plant consists of a 70m tower, where activated clay, ground granulated blast furnace slag (GGBFS) and gypsum are mixed to produce the cement. It is installed with solar panels capable of supplying 50% of its energy consumption. The producer says that its clinker-free cement has over 90% lower CO2 emissions than cement produced with ordinary Portland cement (OPC). It aims to sell 24,000t of the product throughout 2023.