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Effects of blast-furnace slag on natural pozzolan-based geopolymer cement
A number of geopolymer cement mixes were designed and produced by alkali-activation of a pumice-type natural pozzolan. Effects of blast-furnace slag on basic engineering properties of the mixes were studied. Different engineering properties of the mixes such as setting times and 28-day compressive strength were studied at different amounts of blast-furnace slag, sodium oxide content, and water-to-cement ratio. The mix comprising of5 weight-% blast-furnace slag and 8 weight-% Na2O with a water-to-dry binder ratio of 0.30 exhibits the highest 28-day compressive strength, i.e. 36 MPa. Mixes containing 5 weight-% of ground granulated blastfurnace slag showed the least efflorescence or best soundness. Laboratory techniques of XRD (X-ray diffractometry), FTIR (Fourier transform infraredspectroscopy), and SEM (scanning electron microscopy) were utilized for characterizing a number of mixes and studying their molecular and micro-structure. Investigations done by scanning electron microscopy confirm that smaller blast-furnace slag particles react totally while the larger ones react partially with alkaline activators and contribute to the formation of a composite microstructure.
Effects of blast-furnace slag on natural pozzolan-based geopolymer cement
A number of geopolymer cement mixes were designed and produced by alkali-activation of a pumice-type natural pozzolan. Effects of blast-furnace slag on basic engineering properties of the mixes were studied. Different engineering properties of the mixes such as setting times and 28-day compressive strength were studied at different amounts of blast-furnace slag, sodium oxide content, and water-to-cement ratio. The mix comprising of5 weight-% blast-furnace slag and 8 weight-% Na2O with a water-to-dry binder ratio of 0.30 exhibits the highest 28-day compressive strength, i.e. 36 MPa. Mixes containing 5 weight-% of ground granulated blastfurnace slag showed the least efflorescence or best soundness. Laboratory techniques of XRD (X-ray diffractometry), FTIR (Fourier transform infraredspectroscopy), and SEM (scanning electron microscopy) were utilized for characterizing a number of mixes and studying their molecular and micro-structure. Investigations done by scanning electron microscopy confirm that smaller blast-furnace slag particles react totally while the larger ones react partially with alkaline activators and contribute to the formation of a composite microstructure.
Effects of blast-furnace slag on natural pozzolan-based geopolymer cement
Einfluss von Hochofenschlacke auf einen natürlichen puzzolanbasierten Geopolymerzement
Allahverdi, Ali (author) / Najafi Kani, Ebrahim (author) / Yazdanipour, Mahshad (author)
Ceramics Silikaty, Prag ; 55 ; 68-78
2011
11 Seiten, 24 Bilder, 4 Tabellen, 27 Quellen
Article (Journal)
English
Geopolymer , puzzolanische Reaktion , Puzzolanzement , Hochofenschlacke , Schlackenzement , alkalische Anregung , Druckfestigkeit , Wasser-Zement-Wert , Wasserabbinden von Zement , Erhärten (Zementabbinden) , Mikrostruktur , Werkstoffgefüge , Korngröße , Bimsstein , mineralogische Zusammensetzung , Anorthit , Biotit , Korngrößenverteilung , Kristallinität
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