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Title:
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Synthesis and Crystal Structure Solution of Potassium Dawsonite: an intermediate compound in the alkaline hydrolysis of Calcium Aluminate Cements
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Author:
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Fernández Carrasco, Lucía; Puertas, F.; Blanco Varela, M.Teresa; Vázquez, T.; Rius, J.
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Construccions Arquitectòniques I |
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Abstract:
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Potassium dawsonite is formed as an intermediate compound during the alkaline hydrolysis (AH) in calcium aluminate cements (CACs). A synthesis method of potassium dawsonite has been developed. The crystal structure of potassium dawsonite KAl(CO3)(OH)2 has been solved by direct methods from X-ray powder diffraction data and refined with the Rietveld method. It crystallises in the orthorhombic Cmcm space group with unit cells parameters a=6.3021(3) Å, b=11.9626(5) Å, c=5.6456(3) Å and Z=4. The structure consists of carboaluminate chains, formed by the basic unit [Al2(OH)4(CO3)2]2− arranged along the c axis. The carbonate groups are placed in an alternate manner at both sides of the carboaluminate chains. The carboaluminate chains are also held together by the K+ cations that are located in the middle of three such chains. Finally, the chemical reactions explaining the AH process in CACs are postulated. |
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Abstract:
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Peer Reviewed |
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Subject(s):
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-Àrees temàtiques de la UPC::Edificació::Materials de construcció::Ciment
-Cement
-Ciment |
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Rights:
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Document type:
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Article - Published version
Article |
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Published by:
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Elsevier
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