Displaying items by tag: Calcined Clay

India: Noida International Airport (NIA) has become India's first large-scale project to utilise limestone calcined clay cement (LC3), a low-carbon alternative to traditional cement. In a statement, concessionaire Yamuna International Airport Private Limited (YIAPL) said LC3 was used extensively in the construction of the airport.

Developed for more than 10 years by researchers at IIT Delhi, IIT Madras, Swiss Development Cooperation, École Polytechnique Fédérale de Lausanne (Switzerland), Universidad de las Villas (Cuba), and Technology and Action for Rural Advancement (TARA), LC3 emits up to 40% less CO₂ than conventional Portland cement. It costs 25% less to produce, uses low-grade limestone and clays and requires lower energy for manufacturing while delivering comparable strength.

Ghana: Continental Blue Investment Ghana (CBI) may receive up to US$20m from the International Finance Corporation (IFC) for a limestone calcined clay cement (LC3) plant in Tema, according to Ecofin Agency. The US$66.7m project is supported by Société Générale, Norfund and Denmark’s export credit agency EKF, with IFC’s board due to decide on 30 September 2025.

The company said that the facility operates with the ‘world’s largest’ flash calciner, and has a capacity of 400,000t/yr of calcined clay. With the funding, CBI plans to raise output from 600,000t/yr to 1.4Mt/yr, reducing clinker imports and lowering cement prices.

CBI is owned by Swiss holding company F. Scott in a joint venture with Heidelberg Materials, with minority stakes held by Norway and Denmark’s public funds and Danish equipment supplier FLSmidth.

Ivory Coast: Gebr. Pfeiffer will supply an MVR 3070 R-2 vertical roller mill to Ciments de Côte d'Ivoire (CIMCI) for clay grinding at its cement plant. The mill will produce 62t/hr of clay at ≤10% R 0.090mm for use in calcined clay cement. The order was placed by China-based contractor CBMI, which is managing the engineering, procurement and construction contract and will also supply the suspension calcination plant. The mill is scheduled to begin operation at the end of 2026.

UK: Clay brick and concrete products producer Ibstock is seeking an industrial partner for a ‘major’ calcined clay cement plant in the UK.

The group has identified a large reserve of high-kaolin clay at one of its operating brick clay quarries in central England. The site is a fully-consented quarry, with sufficient calcinable material to support calcined clay production for more than 25 years. ‘Extensive’ drilling and industrial trials have been completed to confirm the reserves and the reactivity of the calcined clay for use in low-carbon cement production.

Ibstock says that is looking at an industrial partner to collaborate on the design, construction and commercialisation of the project. It is open to exploring optimal investment and partnership models to fully realise the potential of the site.

Email Ibstock to discuss the project: This email address is being protected from spambots. You need JavaScript enabled to view it.

US: Researchers at the Massachusetts Institute of Technology (MIT) have developed an AI tool to compare studies of alternative raw materials for cement production. A collaborative team from the MIT Concrete Sustainability Hub and MIT’s recycling research programme, Olivetti Group, published its findings in the Nature journal. The team mined 5.7m academic publications to identify 14,434 alternative raw materials. These belonged to 19 ‘types,’ including bottom ashes, fly ashes, calcined clays and slags, as well as less homogenous types such as biomass ashes, glasses and mine tailings. The study more than doubles the number of fly ashes and slags recorded on a database of this kind. The tool then provides a unified assessment of cementitious reactivity and pozzolanicity, also accounting for variables in particle size and amorphous content.

Ghana: CBI Ghana and joint venture partner Heidelberg Materials have commissioned the ‘world’s largest’ calcined clay plant in Ghana, according to an announcement by the German producer. The plant has a capacity of 400,000t/yr of calcined clay and uses local raw materials to reduce reliance on imported clinker.

Hakan Gurdal, member of the managing board of Heidelberg Materials, said “Based on calcined clay technology, we can now extend our offering of innovative, high-quality cement products, while reducing CO₂ emissions and utilising the rich local resources. The project has created over 300 local jobs."

Portugal: Cimpor will invest €155m in establishing a new research and development centre focused on sustainable construction, CO₂ reduction and digital transformation. The investment will also cover the modernisation of Kiln 7 at the producer’s Alhandra cement plant. The new centre will focus on technologies such as low-clinker cement development, carbon capture and alternative fuels, using recycled concrete and 3D printing. The building itself will incorporate calcined clay-based cement and recycled aggregates.

The new centre will create over 100 jobs and serve as a hub for collaboration with universities and startups, as well as serve as a location for conferences and workshops. The building will operate as a ‘living lab’, with real-time monitoring of its thermal and structural performance and energy consumption.

The chair of Cimpor Global Holdings, Suat Çalbiyik, said “In 2018, we operated only in Portugal and Cape Verde with around 1800 employees. Today, we are the world’s third-largest cement group… with 8000 employees in 14 countries and a production capacity of 112.5Mt/yr of cement.”

Ghana: CBI Ghana has invested US$100m in a new plant in Tema to produce limestone calcined clay cement (LC3) using local raw materials, to reduce reliance on imported clinker.

Commercial director of Supacem Kobby Adams said that the Ghana Standards Authority’s adoption of the GS PAS 5:2024 LC3 standard enabled the launch, following collaboration with local universities and international partners. According to Graphic Business news, the current clinker scarcity and its escalating prices stemmed from a 6% currency depreciation between December 2024 and February 2025 and the evolving global market uncertainties, including an increase in clinker export prices from the Mediterranean.

The project reportedly created over 160 direct jobs through local sourcing and infrastructure development in Tema and Torgome.

UK: LKAB Minerals and Forterra have partnered to produce recycled calcined clay from unwanted bricks as a traditional cement replacement, with production set to begin at LKAB’s Flixborough plant in Scunthorpe in June 2025. The material is made by crushing bricks sourced from Forterra’s Kings Dyke site in Peterborough.

LKAB Minerals UK managing director Steve Handscomb said “The traditional manufacturing and materials industries have to work harder than other less energy intensive industries, and need significant investments to upgrade equipment. We are committed to playing a role in the transition. In fact, we are already a significant producer of GGBS, and in our minerals division, 45% of the minerals we sell are from recycled sources or by-products.”

UK: The University of Sheffield, the Sellafield power station, the Nuclear Decommissioning Authority and the UK National Nuclear Laboratory have launched a €1.2m research partnership to explore the use of limestone calcined clay cement (LC3) in nuclear waste encapsulation. The project will study how characteristics and amounts of calcined clays can produce cement encapsulants that support safe and reliable nuclear waste conditioning and disposal at Sellafield.

Head of the Sheffield research team Brant Walkley said “This partnership will enhance our overall programme of work focused on development of new cement technologies for the nuclear sector, and will enable our cross-sector team based at both the University of Sheffield and Sellafield to further strengthen its position as a global leader in cement science and engineering.”