C<sub>4</sub>A<sub>3</sub>Š hydration in different alkaline media: Fid-Bau Portal

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C₄A₃Š hydration in different alkaline media

Sanchez-Herrero, M.J. / Fernandez-Jimenez, A. / Palomo, A.

This study explored the behaviour of laboratory-synthesised calcium sulphoaluminate (C₄A₃Š) in alkaline media. C₄A₃Š was hydrated in three liquid media: water, 8-M NaOH and 4 (wt.%) Na₂CO₃ added to the C₄A₃Š + water mix. Hydration kinetics were studied via isothermal conduction calorimetry and 2- and 28-day mechanical strength values were found. The reaction products were characterised with XRD and FTIR. The findings showed that whilst C₄A₃Š hydration kinetics were accelerated in the presence of alkalis, the resulting pastes had lower mechanical strength than the pastes hydrated with water and exhibited severe decay in some cases. An analysis of the hydration products revealed the presence of ettringite in the water-hydrated C₄A₃Š pastes, whereas under alkaline conditions the main calcium sulphoaluminate hydrate detected was U phase.

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C₄A₃Š hydration in different alkaline media

Sanchez-Herrero, M.J. / Fernandez-Jimenez, A. / Palomo, A.

This study explored the behaviour of laboratory-synthesised calcium sulphoaluminate (C₄A₃Š) in alkaline media. C₄A₃Š was hydrated in three liquid media: water, 8-M NaOH and 4 (wt.%) Na₂CO₃ added to the C₄A₃Š + water mix. Hydration kinetics were studied via isothermal conduction calorimetry and 2- and 28-day mechanical strength values were found. The reaction products were characterised with XRD and FTIR. The findings showed that whilst C₄A₃Š hydration kinetics were accelerated in the presence of alkalis, the resulting pastes had lower mechanical strength than the pastes hydrated with water and exhibited severe decay in some cases. An analysis of the hydration products revealed the presence of ettringite in the water-hydrated C₄A₃Š pastes, whereas under alkaline conditions the main calcium sulphoaluminate hydrate detected was U phase.

C₄A₃Š hydration in different alkaline media

Sanchez-Herrero, M.J. / Fernandez-Jimenez, A. / Palomo, A.

This study explored the behaviour of laboratory-synthesised calcium sulphoaluminate (C₄A₃Š) in alkaline media. C₄A₃Š was hydrated in three liquid media: water, 8-M NaOH and 4 (wt.%) Na₂CO₃ added to the C₄A₃Š + water mix. Hydration kinetics were studied via isothermal conduction calorimetry and 2- and 28-day mechanical strength values were found. The reaction products were characterised with XRD and FTIR. The findings showed that whilst C₄A₃Š hydration kinetics were accelerated in the presence of alkalis, the resulting pastes had lower mechanical strength than the pastes hydrated with water and exhibited severe decay in some cases. An analysis of the hydration products revealed the presence of ettringite in the water-hydrated C₄A₃Š pastes, whereas under alkaline conditions the main calcium sulphoaluminate hydrate detected was U phase.

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Titel:

C₄A₃Š hydration in different alkaline media

Beteiligte:

Sanchez-Herrero, M.J. (Autor:in) / Fernandez-Jimenez, A. (Autor:in) / Palomo, A. (Autor:in)

Erschienen in:

Cement and Concrete Research ; 46 ; 41-49

Erscheinungsdatum:

2013

Format / Umfang:

9 Seiten, 58 Quellen

ISSN:

DOI:

https://doi.org/10.1016/j.cemconres.2013.01.008

Medientyp:

Aufsatz (Zeitschrift)

Format:

Print

Sprache:

Englisch

Schlagwörter:

Kalorimetrie , Hydratation , Röntgenbeugung , Alkalihydroxid , alkalisches Medium , Calciumaluminat , Calciumaluminathydrat , Kinetik , Reaktionsprodukt , Ettringit

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