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Acid based geopolymerization kinetics: Effect of clay particle size
AbstractThe kinetic of acid-based geopolymer synthesis was studied for different granulometric classes (125μm, 100μm, 80μm and 63μm) of calcined illito-kaolinitic clay. X-ray diffraction (XRD), infrared spectroscopy (IR), Nuclear Magnetic Resonance (MAS NMR), scanning electron microscopy (SEM) and mechanical measurements were used to investigate geopolymerization kinetic. These techniques have shown that the fineness of the precursor has a significant effect on geopolymerization kinetic and on the mechanical properties of the product. A geopolymerization mechanism including three steps has been proposed: dealumination of metakaolinite, reaction between phosphoric acid PO4 tetrahedral units with SiO layer, on one hand, to form an amorphous (SiOPO) structure, and with leached aluminum, on the other hand, to give crystalline AlPO4 and finally polycondensation in the amorphous phase. The final product is a geopolymeric composite composed by crystalline AlPO4 and amorphous (SiOPO) structure.
HighlightsThe influence of the clay particle size on the kinetics of geopolymerization is studiedGeopolymerization kinetic is followed by the Si–OM band displacement versus timeGeopolymerisation involves 3 steps: dealumination, formation of (-Si-O-P-) structure, and crystalline AlPO4 and finally polycondensationThe final product is a geopolymeric composite of crystalline AlPO4 and amorphous (-Si-O-P-O-) structure
Acid based geopolymerization kinetics: Effect of clay particle size
AbstractThe kinetic of acid-based geopolymer synthesis was studied for different granulometric classes (125μm, 100μm, 80μm and 63μm) of calcined illito-kaolinitic clay. X-ray diffraction (XRD), infrared spectroscopy (IR), Nuclear Magnetic Resonance (MAS NMR), scanning electron microscopy (SEM) and mechanical measurements were used to investigate geopolymerization kinetic. These techniques have shown that the fineness of the precursor has a significant effect on geopolymerization kinetic and on the mechanical properties of the product. A geopolymerization mechanism including three steps has been proposed: dealumination of metakaolinite, reaction between phosphoric acid PO4 tetrahedral units with SiO layer, on one hand, to form an amorphous (SiOPO) structure, and with leached aluminum, on the other hand, to give crystalline AlPO4 and finally polycondensation in the amorphous phase. The final product is a geopolymeric composite composed by crystalline AlPO4 and amorphous (SiOPO) structure.
HighlightsThe influence of the clay particle size on the kinetics of geopolymerization is studiedGeopolymerization kinetic is followed by the Si–OM band displacement versus timeGeopolymerisation involves 3 steps: dealumination, formation of (-Si-O-P-) structure, and crystalline AlPO4 and finally polycondensationThe final product is a geopolymeric composite of crystalline AlPO4 and amorphous (-Si-O-P-O-) structure
Acid based geopolymerization kinetics: Effect of clay particle size
Louati, S. (author) / Baklouti, S. (author) / Samet, B. (author)
Applied Clay Science ; 132-133 ; 571-578
2016-08-05
8 pages
Article (Journal)
Electronic Resource
English
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