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Synthesis of thaumasite
Synthesis of thaumasite applying Struble's method (mix of two cold sugary solutions containing CaO and Na2SiO3 + Na2SO4 + Na2CO3 respectively, in stoichiometric proportions), was carried out. Amorphous calcium carbonates and calcium silicate hydrates (intermediate products) were obtained at the very beginning stages of the reaction, which evolved with time forming thaumasite. Thaumasite polluted by calcite and calcium silicate hydrate was obtained after 2 years of reaction. Pure thaumasite was obtained when initial solutions contained less sodium carbonate and sodium silicate than the stoichiometric proportions. The synthesised thaumasite was characterised by XRD, FTIR, SEM/EDX and 29.Si CP MAS NMR.
Synthesis of thaumasite
Synthesis of thaumasite applying Struble's method (mix of two cold sugary solutions containing CaO and Na2SiO3 + Na2SO4 + Na2CO3 respectively, in stoichiometric proportions), was carried out. Amorphous calcium carbonates and calcium silicate hydrates (intermediate products) were obtained at the very beginning stages of the reaction, which evolved with time forming thaumasite. Thaumasite polluted by calcite and calcium silicate hydrate was obtained after 2 years of reaction. Pure thaumasite was obtained when initial solutions contained less sodium carbonate and sodium silicate than the stoichiometric proportions. The synthesised thaumasite was characterised by XRD, FTIR, SEM/EDX and 29.Si CP MAS NMR.
Synthesis of thaumasite
Synthese von Thaumasit
Aguilera, J. (author) / Blanco-Varela, M.T. (author) / Vazquez, T. (author)
2002
8 Seiten, 6 Bilder, 4 Tabellen, 13 Quellen
Conference paper
Storage medium
English
Calcit , Calciumcarbonat , Calciumoxid , Calciumsilicathydrat , chemische Zusammensetzung , Dauerhaftigkeit , energiedispersive Röntgenspektrometrie , FT-IR-Spektroskopie , Lösung (Chemie) , magnetisches Kernresonanzspektrum , Natriumcarbonat , Natriumsilicat , Natriumsulfat , Rasterelektronenmikroskop , Röntgenbeugung , Synthese , Thaumasit , Zement , Zwischenprodukt
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