DSC, TGA, XRD, SEM and mechanical tests were used to characterize geopolymer materials based on Na2O-K2O-Al 2O3-SiO2 system up to 1300°C. For all compositions, sodium silicate was used as binder. The samples of geopolymer which were cured at room temperature demonstrated dimensional stability up to 1200°C, with exception of samples with K which was stable up to 1300°C, retaining their predominant x-ray-amorphous tetrahedral Al and Si network (polysialates). The four point flexural and compressive strengths test demonstrated a slight decrease of mechanical properties up to 700°C followed by an exponential increase up to the melting temperature.
Thermal behaviour of geopolymer materials: Influence of temperature on mineralogical composition and microstructure of sodium-potassium polysialates / Kamseu, E.; Leonelli, C.; Sglavo, V. M.. - (2008). (Intervento presentato al convegno 2nd International Congress on Ceramics, ICC 2008 tenutosi a Verona, ita nel 2008).
Thermal behaviour of geopolymer materials: Influence of temperature on mineralogical composition and microstructure of sodium-potassium polysialates
Kamseu E.;Leonelli C.;Sglavo V. M.
2008
Abstract
DSC, TGA, XRD, SEM and mechanical tests were used to characterize geopolymer materials based on Na2O-K2O-Al 2O3-SiO2 system up to 1300°C. For all compositions, sodium silicate was used as binder. The samples of geopolymer which were cured at room temperature demonstrated dimensional stability up to 1200°C, with exception of samples with K which was stable up to 1300°C, retaining their predominant x-ray-amorphous tetrahedral Al and Si network (polysialates). The four point flexural and compressive strengths test demonstrated a slight decrease of mechanical properties up to 700°C followed by an exponential increase up to the melting temperature.
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