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Use of iron and steel slags in concrete: State of the art and future perspectives
Get PDFIn the two last decades, world production of pig iron and steel has undergone a significant increase. In 2018, 1252.87 and 1806.46 million tons of pig iron and steel, respectively, were produced as compared to the 575.78 and 809.94 million tons of 2000. Consequently, the amount of the different types of slags deriving from these production processes has also increased considerably. In relation to the principles of sustainability and circular economy, the available literature suggests several possible reuses for these slags (bituminous conglomerates, hydraulic engineering, metallurgy, fertilizers, etc.). This paper aims to provide an overview of the iron and steel slags production and their reuse in concrete (for example as replacement of cement, fine or coarse aggregates). The characteristics of slags are analyzed in terms of chemical, physical, and mechanical properties. Mechanical and durability tests (both from material and structures point of view) carried out in the different studies and research are shown as well. Particular attention was devoted to electric arc furnace slags (EAF) since they are the most produced in Italy. Based on this deep literature review, the gaps that still require further studies have been identified and discussed
On the use of Electric Arc Furnace slags in concrete for structural applications
No full textIn Italy, in 2020, the production of slag from electric arc furnace (EAF) has been estimated in about 3 million tons, with disposal rates in landfills still around 45–50%. Due to their characteristics, steelmaking slags represent a valid alternative to the natural materials commonly used, especially in the construction sector. Therefore, the aim of this work is to analyse the behavior of concrete mixtures with the addition of different percentages (0, 10, 25 and 50%) of EAF slag, evaluating both rheological and strength properties over time. The results of the tests showed that the use of EAF slag for the production of ordinary concrete is possible as rheological and mechanical properties are maintained and/or improved
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