Article (Scientific journals)
(Micro)-structural comparison between geopolymers, alkali-activated slag cement and Portland cement
Lecomte, I.; Henrist, Catherine; Duyckaerts, Monique et al.
2006In Journal of the European Ceramic Society, 26 (16), p. 3789-3797
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Keywords :
electron microscopy; microstructure-final; spectroscopy; X-ray methods; cements; geopolymers
Abstract :
[en] 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 mix GP-AAS and fully compared about their compositions and (micro)-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, Si-29 and At-27 magic-angle-spinning nuclear magnetic resonance spectroscopy: there is a polymerisation extent of the (alumino)-silicate framework from PC [SiQ(1) and SiQ(2) units] to AAS [SiQ(2) and SiQ(2)(1Al) units] and finally to GP [SiQ(4)(2Al) and SiQ(4)(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. (c) 2006 Elsevier Ltd. All rights reserved.
Disciplines :
Materials science & engineering
Author, co-author :
Lecomte, I.
Henrist, Catherine ;  Université de Liège - ULiège > Chimie inorganique structurale
Duyckaerts, Monique ;  Université de Liège - ULiège > Chimie inorganique structurale
Maseri, F.
Rulmont, André ;  Université de Liège - ULiège > Chimie inorganique structurale
Cloots, Rudi ;  Université de Liège - ULiège > Chimie inorganique structurale
Language :
English
Title :
(Micro)-structural comparison between geopolymers, alkali-activated slag cement and Portland cement
Publication date :
2006
Journal title :
Journal of the European Ceramic Society
ISSN :
0955-2219
Publisher :
Elsevier Sci Ltd, Oxford, United Kingdom
Volume :
26
Issue :
16
Pages :
3789-3797
Peer reviewed :
Peer Reviewed verified by ORBi
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