Materiales de Construcción, Vol 52, No 267 (2002)

Study of the instability of black slags from electric arc furnace steel industry

M. Frías
Instituto Eduardo Torroja (CSIC), Spain

M. I. Sánchez de Rojas
Instituto Eduardo Torroja (CSIC), Spain

A. Uría
Altuna y Uría, S. A, Spain


In Spain, the steel manufacture produces important quantities of by-products, representing between 15 and 20 % of total steel production. Most by-products are deposited on open air spaces causing serious economical and environmental problems, internationally, different recycling wais are studied, being the main alternative for these by-products as recycled aggregate. The possibility of recycling these by-products in construction sector depends on its possible volume instability because of the presence of some undesirable compounds. In current paper, two different black slags from electric arc furnace steel industry were chemically characterized, paying attention to some well-known compounds by theirs expansion effects, such as: free CaO, free MgO, chlorides and sulphates.
The analytical results carried out in the current research detected the presence of insignificant or null amounts of harmful compounds. Therefore, they should not have any negative incidence on phenomena of volume instability.


electric arc furnace slag; chemical and mineralogical composition; expansive compounds

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Copyright (c) 2002 Consejo Superior de Investigaciones Científicas (CSIC)

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