Mineral Residues and By-Products Upcycled into Reactive Binder Components for Cementitious Materials

Florian Roman Steindl, Klaus Doschek-Held, Katharina Weisser, Joachim Juhart, Cyrill Grengg, Dominik Wohlmuth, Florian Mittermayr

Research output: Chapter in Book/Report/Conference proceedingChapterResearch


In contrast to granulated blast-furnace slag (GBFS), many other industrial residues and by-products such as steel slags are currently not utilised to produce hydraulic or alkali-activated binders. Simultaneously, the building materials industry is confronted with steadily growing demands for increased CO2 and resource efficiency, as well as dwindling supplies of traditional supplementary cementitious materials. This contribution covers the characterisation of slag-like compounds prior to and after carbothermal treatment, with respect to their utilisation potential as binder components. The treated materials were highly amorphous with a favourable chemical composition - particularly high contents of CaO, SiO2, Al2O3 and MgO, high (CaO+MgO)/SiO2-ratios (>1.0, ideally > 1.2) and low amounts of unwanted impurities like Fe- and Mn-containing compounds. Subsequent characterisation of the reactivity of the processed materials revealed high hydraulic activity (activity index up to >100% after 28 days) and suitability for alkali-activation. In contrast, the untreated materials showed only insufficient hydraulic activity but could successfully be used as binder components in alkali-activated materials. Chemical indices based on the amorphous content and the content of CaO, MgO, Al2O3, SiO2, FeO and MnO were identified as suitable control parameters for estimating the potential hydraulic activity of slag-like materials.
Original languageGerman
Title of host publicationInternational RILEM Conference on Synergising Expertise towards Sustainability and Robustness of Cement-based Materials and Concrete Structures
EditorsAgnieszka Jędrzejewska, Fragkoulis Kanavaris, Miguel Azenha, Farid Benboudjema, Dirk Schlicke
PublisherSpringer Science and Business Media B.V.
Number of pages12
ISBN (Print)978-3-031-33186-2, 978-3-031-33189-3
Publication statusPublished - 2023

Publication series

NameRILEM Bookseries

Cite this