India: The Samruddhi Expressway stretches 701km from Nagpur to Mumbai. This project by the Maharashtra State Road Development Corporation (MSRDC) has been focused on reducing environmental impact by the use of fly ash and blast furnace slag in its concrete.

Anil Gaikwad, managing director of the MSRDC, said "Fly ash and ground granulated blast furnace slag were also used in the concrete,” He continued “Fly ash has been used to the extent of 20% in the concrete."

The project emphasised circularity by reusing and recycling materials. Responsible sourcing of materials was a key component, ensuring vendors complied with environmental standards. Innovative water management strategies were also implemented, including the creation of farm ponds through agreements with local farmers.

UAE: Emirates Steel Arkan has concluded a partnership for the deployment of Finland-based Magsort’s technology in steel slag processing at its Al Ain cement plant. ZAWYA News has reported that the partners expect the technology to help reduce the plant’s limestone and fuel consumption. This will reduce its CO₂ emissions by 15%.

Emirates Steel Arkan CEO Saeed Ghumran Al Remeithi said "Green solutions such as this will help decarbonise the sector's value chain."

US: The Department of Transportation has announced a US$5m initiative to investigate the use of steel slag in cement and concrete. This will take the form of a collaboration between the Department of Transportation and a selected US-based steel producer and university partner. The initiative seeks to reduce CO₂ emissions in the production of building materials. Prospective participants may view the grant opportunity here.

Transport secretary Pete Buttigieg said "We're proud to make this funding available to help develop the next generation of construction materials so that the future of our transport infrastructure is more resilient, more sustainable and made in America.”

Robert Hampshire, deputy assistant secretary for research and technology and chief science officer, said “This funding initiative will develop and advance innovative materials and technologies that support the nation’s goals to decarbonise the transportation sector by 2050, strengthen resilience of the nation’s transportation infrastructure, and address adverse environmental impacts created by the transportation system.”

Spain: Heidelberg Materials and construction firm Viuda de Sainz plan to open a construction and demolition waste (CDW) recycling and slag grinding plant in Güeñes, Basque Country. The plant, called Harri Green, will be situated in Heidelberg Materials' existing Zaramillo limestone quarry. It processing capacities will be 140,000t/yr CDW and 20,000t/yr steel slag, with which it will produce aggregates. The cost of the plant is Euro2m.