Effect of gypsum on the hydration of fused cement clinker from basic oxygen furnace slag
Source abstract
Abstract
Fused cement clinker can be produced from molten basic oxygen furnace slag (BOFS) by way of a reductive thermochemical treatment. During the thermochemical treatment, oxidic iron is reduced to metallic iron and separated. The resulting low-iron slag has a chemical and mineralogical composition similar to ordinary Portland cement (OPC) clinker. In this study, the hydraulic reactivity of the fused clinker from BOFS with and without gypsum was investigated using isothermal calorimetry, differential scanning calorimetry, in situ X-ray diffraction and powder X-ray diffraction. Furthermore, a synthetic fused clinker without foreign ions and fused clinker produced by a mixture of both materials was studied. The hydraulic reaction of the fused clinker from BOFS was considerably slower than that of OPC. However, the reaction can be accelerated by adding gypsum as a sulfate carrier. Furthermore, the results showed an increased reaction rate with decreasing content of foreign ions such as Fe, P or Mn.
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Research context
OpenAlex topics: Concrete and Cement Materials Research · Advanced ceramic materials synthesis · Advanced materials and composites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Division 4.4 Thermochemical Residues Treatment and Resource Recovery, Bundesanstalt für Materialforschung und -prüfung (BAM), Richard-Willstätter-Straße 11, Berlin, Germany (corresponding author: )
Division 4.4 Thermochemical Residues Treatment and Resource Recovery, Bundesanstalt für Materialforschung und -prüfung (BAM), Richard-Willstätter-Straße 11, Berlin, Germany
Department of Civil Engineering, Building Materials and Construction Chemistry, Technische Universität Berlin, Gustav-Meyer-Allee 25, Berlin, Germany
Division 7.1 Building Materials, Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, Berlin, Germany
Division 7.4 Technology of Construction Materials, Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, Berlin, Germany
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