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Microstructure and Mechanical Properties of Slag Activated with Sodium Silicate

Caron, Richard ORCID iD icon 1; Dehn, Frank 1
1 Institut für Massivbau und Baustofftechnik (IMB), Karlsruher Institut für Technologie (KIT)

Abstract:

The study focuses on developing a detailed understanding of microstructure and mechanical behaviour of alkali-activated slag with sodium silicate. The slag used in this study was provided by Ecocem (Netherlands) and consists of 38.8 % CaO, 36.3 % SiO$_2$, 12.8 % Al$_2$O$_3$ and 8.0 % MgO. It was activated with two sodium silicate solutions. The two mixes were studied on a paste level. They have the same water/slag ratio w/s = 0.4 kg/kg and the same sodium content n = 5.0 g Na$_2$O / 100 g slag. Two silicate ratios were investigated: Ms = 0.5 and Ms = 2.2 moles of SiO$_2$ / moles of Na$_2$O. Early-age mechanisms and reaction products of the activation of the slag were analysed with isothermal calorimetry, SEM images and chemical characterization. In addition, compressive and flexural strength were determined. Despite different reaction steps in comparison to ordinary Portland cement, the obtained mechanical properties seem to be sufficient for structural application.


Verlagsausgabe §
DOI: 10.5445/IR/1000150438
Veröffentlicht am 07.09.2022
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Massivbau und Baustofftechnik (IMB)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 2644-108X
KITopen-ID: 1000150438
Erschienen in State-of-the-art Materials and Techniques in Structural Engineering and Construction. Ed.: K. Holschemacher
Veranstaltung 4th European and Mediterranean Structural Engineering and Construction Conference (2022), Leipzig, Deutschland, 20.06.2022 – 25.06.2022
Verlag ISEC Press
Seiten Art.-Nr.: AAC-01
Serie Proceedings of International Structural Engineering and Construction ; 9
Schlagwörter Activation, Kinetics, Compressive strength, Structural applications
Nachgewiesen in Dimensions
Scopus
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