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(Micro)-structural comparison between geopolymers, alkali-activated slag cement and Portland cement
Concurrently to research conducted on ordinary Portland cement (PC), new types of binders were developed during the last decades. These are formed by alkali-activation of metakaolin or ground-granulated blast furnace slag (GGBFS) and are named, respectively, geopolymers (GP) or alkali-activated slag (AAS). Four different cementitious materials were synthesised: PC, AAS, GP, and a rnix GP-AAS and fully compared about their compositions and (rnicro)-structures. X-ray diffraction has revealed the presence of semi-crystalline C-S-H gel binding phase in PC while AAS, GP and GP-AAS are nearly amorphous. Progressive structural changes have been observed between the different samples by means of infrared spectroscopy, 29.Si and 27.Al magic-angle-spinning nuclear magnetic resonance spectroscopy: there is a polymerisation extent of the (alumino)-silicate framework from PC [SiQ1 and SiQ2 units] to AAS [SiQ2 and SiQ2(1Al) units] and finally to GP [SiQ4(2Al) and SiQ4(3Al) units]. Scanning electron microscopy has shown that GP is a homogeneous matrix while the other materials are composites containing GGBFS grains surrounded by a binding matrix. Energy dispersive X-ray EDX analyses (line scans) have shown the absence of formation of any specific phase at the matrix-grains interfaces.
(Micro)-structural comparison between geopolymers, alkali-activated slag cement and Portland cement
Concurrently to research conducted on ordinary Portland cement (PC), new types of binders were developed during the last decades. These are formed by alkali-activation of metakaolin or ground-granulated blast furnace slag (GGBFS) and are named, respectively, geopolymers (GP) or alkali-activated slag (AAS). Four different cementitious materials were synthesised: PC, AAS, GP, and a rnix GP-AAS and fully compared about their compositions and (rnicro)-structures. X-ray diffraction has revealed the presence of semi-crystalline C-S-H gel binding phase in PC while AAS, GP and GP-AAS are nearly amorphous. Progressive structural changes have been observed between the different samples by means of infrared spectroscopy, 29.Si and 27.Al magic-angle-spinning nuclear magnetic resonance spectroscopy: there is a polymerisation extent of the (alumino)-silicate framework from PC [SiQ1 and SiQ2 units] to AAS [SiQ2 and SiQ2(1Al) units] and finally to GP [SiQ4(2Al) and SiQ4(3Al) units]. Scanning electron microscopy has shown that GP is a homogeneous matrix while the other materials are composites containing GGBFS grains surrounded by a binding matrix. Energy dispersive X-ray EDX analyses (line scans) have shown the absence of formation of any specific phase at the matrix-grains interfaces.
(Micro)-structural comparison between geopolymers, alkali-activated slag cement and Portland cement
(Mikro)struktureller Vergleich zwischen Geopolymeren, alkaliaktiviertem Schlackenzement und Portlandzement
Lecomte, I. (author) / Henrist, C. (author) / Liegois, M. (author) / Maseri, F. (author) / Rulmont, A. (author) / Cloots, R. (author)
Journal of the European Ceramic Society ; 26 ; 3789-3798
2006
10 Seiten, 8 Bilder, 3 Tabellen, 26 Quellen
Article (Journal)
English
Portlandzement , Schlackenzement , alkalische Anregung , Geopolymer , Bindemittel , Mikrostruktur , Phasenzusammensetzung , amorpher Zustand , Polymerisation , Verbundwerkstoff , Interface (Grenzfläche) , Röntgenbeugung , magnetische Kernresonanz , Rasterelektronenmikroskopie , Fourier-Transform-Infrarotspektroskopie , Röntgenmikroanalyse
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