Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Ettringite: A new synthesis approach
To understand the development of mechanical and physical properties of cementitious systems, it is crucial to investigate the critical rapid mineralogical changes that occur especially during early hydration stages. In particular in the really first minutes C3A and C4AF rapidly react with water producing typical hydration products (AFm, AFt). Reactions that take place in real cement pastes are complex, so that to simulate these processes in laboratory a reliable and reproducible synthesis method has been developed. This study has been focused on the synthesis of ettringite (Ca6Al2(SO4)3(OH)12*26H2O) that thanks to this technique has been obtained m a very short time and particularly free of impurities. Evolution of particles size and colloidal dispersion stability were followed during the reaction performed under controlled conditions (pH, ionic strength, temperature, stirring and flow rate). Analyses have been performed with ESEM-FEG, Laser Diffraction Granulometry, Turbidimetry, Zeta Potential (ELS), TGA (c-DTA) and XRD. This approach permitted us to understand which are the key parameters that rule the synthesis and hence it can be applied to other AFm, AFt-like systems.
Ettringite: A new synthesis approach
To understand the development of mechanical and physical properties of cementitious systems, it is crucial to investigate the critical rapid mineralogical changes that occur especially during early hydration stages. In particular in the really first minutes C3A and C4AF rapidly react with water producing typical hydration products (AFm, AFt). Reactions that take place in real cement pastes are complex, so that to simulate these processes in laboratory a reliable and reproducible synthesis method has been developed. This study has been focused on the synthesis of ettringite (Ca6Al2(SO4)3(OH)12*26H2O) that thanks to this technique has been obtained m a very short time and particularly free of impurities. Evolution of particles size and colloidal dispersion stability were followed during the reaction performed under controlled conditions (pH, ionic strength, temperature, stirring and flow rate). Analyses have been performed with ESEM-FEG, Laser Diffraction Granulometry, Turbidimetry, Zeta Potential (ELS), TGA (c-DTA) and XRD. This approach permitted us to understand which are the key parameters that rule the synthesis and hence it can be applied to other AFm, AFt-like systems.
Ettringite: A new synthesis approach
Ettringit: Ein neuer Syntheseansatz
Presti, A. lo (Autor:in) / Cerulli, T. (Autor:in) / Biancardi, A. (Autor:in) / Moretti, E. (Autor:in) / Salvioni, D. (Autor:in)
2013
13 Seiten, 10 Bilder, 1 Tabelle, 24 Quellen
Aufsatz (Konferenz)
Englisch
| British Library Online Contents | 2003
| British Library Conference Proceedings | 1998
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| British Library Online Contents | 2001