Abstract
In this work, synthesis procedures to obtain thaumasite were revised. Synthesis of thaumasite applying Struble's method (mix of two cold sugary solutions containing CaO and Na 2 SiO 3 +Na 2 SO 4 +Na 2 CO 3 , 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 synthesized thaumasite was characterized by X-ray diffraction (XRD), FTIR, SEM/EDX, and NMR.
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