Displaying items by tag: ground granulated blast furnace slag

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: 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."

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.

Finland: VTT Technical Research Centre subsidiary Carbonaide has concluded its seed funding round, having raised funds worth Euro1.8m. Lakan Betoni, which produces precast and ready-mix concrete, led the funding, along with utilities provider Vantaa Energy. Carbonaide will use the funds to build an industrial pilot plant for its carbon neutral precast concrete product at an existing precast concrete plant in Hollola. The plant will bind captured CO₂ in the product at atmospheric pressure. The process generates 50% lower CO₂ emissions than precast concrete production using ordinary Portland cement (OPC). Suitable raw materials include ground granulated blast furnace slag (GGBFS), green liquor dregs and bio-ash. In trial production, the use of GGBFS gave Carbonaide's concrete a negative carbon footprint of -60kg/m³.

Other sources of loans and in-kind contributions included Finnish state innovation fund Business Finland.

India: Construction is underway on a section of National Highway 66 in Maharashtra which is being built of concrete made from ground granulated blast furnace slag (GGBFS) and slag cement. India Today News has reported that the Central Road Research Institute developed the technology, in partnership with the National Institute for Transforming India Aayog and the Council of Scientific and Industrial Research.

US: Research by the United States Geological Survey (USGS) estimates that local sales of iron and steel (ferrous) slags were 15Mt in 2022 with a value of around US$795m. This is a slight decrease from the 15.7Mt reported in 2021. 49% of the volume sold in 2022 was blast furnace slag and this accounted for the majority of the total value of the slag. Steel slag produced from basic oxygen and electric arc furnaces accounted for the remainder of sales. Around 2Mt of slag was imported for consumption.

The USGS said that slag was processed by 25 companies servicing active iron and steel facilities or reprocessing old slag piles at about 123 processing plants in 33 states, including facilities that import and grind unground slag to sell as ground granulated blast furnace slag (GGBFS). It added that domestic GGBFS remained in limited supply in 2022 because granulation cooling was available at only two active US-based blast furnaces and only one local plant produced pelletised slag in limited supply. It noted that granulated blast furnace slag was only ground domestically by cement companies.

Australia: Australian Steel Mill Services (ASMS) and the University of Wollongong have launched an investigation into the possible industrial uses of steel furnace slag (SFS) at the Steel Research Hub in Wollongong, New South Wales. ASMS says that SFS has historically had a lower recyclability than ground granulated blast furnace slag (GGBFS) because of its behaviour when hydrated, which potentially includes expanding. The research team believes that SFS might be a possible ingredient for construction materials, including paving slabs. Tests will involve mixtures of SFS with cement, lime, lignosulphonate, coal wash and plastics.

Ireland: Ecocem has launched Superfine, a ground granulated blast furnace slag (GGBS) for use in specialist applications in the European market. The product is a GGBS that has been ground to a very fine particle size. It is intended to be added to other products to improve their strengths in applications such as high performance and ultra-high-performance concrete (UHPC). It can also be used to improve the finish of concrete and reduce the amount of pigment required.

Superfine will be launched across Europe, with the product already being trialled in Abu Dhabi and specified in projects across Ireland. It is designed to be used as a specialist additive in binders, industrial mortars, ultra-high performance concrete (UHPC) and precast concrete.

Susan McGarry, the managing director of Ecocem Ireland, said “After extensive time in research and development, launching Superfine onto the Irish market is testament to our global range of innovative and sustainable concrete solutions.”

Sri Lanka: Insee Cement has broken ground on its construction of a 45,000m3-capacity storage facility at Hambantota International Port. When commissioned in early 2023, the facility will store ground granulated blast furnace slag (GGBFS) for use in Insee Cement's cement production. Daily News has reported the cost of the facility's construction as US$3m. At 17,300m2, the Hambantota storage facility will be the largest warehouse at any port in Sri Lanka.

Insee Cement chair and CEO Nandana Ekanayake said "Hambantota Port is a vital link in our raw materials supply chain. Insee Cement has been using this port since 2018 and so far we have cleared around 1.7Mt of bulk cargo through the port, of which we did a little over 1Mt in 2021. Today, we laid this foundation as another step to strengthen our partnership with Hambantota International Port Group." Ekanayake concluded "We see great potential in developing channels through Hambantota International Port and we will double our investment in the future."