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The influence of alkali-free and alkaline shotcrete accelerators within cement systems - I. Characterization of the setting behavior

Paglia, C. / Wombacher, F. / Bohni, H.

The influence of alkali-free and alkaline accelerators on the setting behavior of cementitious mixtures is investigated. The aluminium sulfate present in the alkali-free accelerators promotes the crystallization of ettringite prisms (2-7 my m) between the clinkers, thus connecting them in a compact mass and accelerating the setting. The very rapid setting promoted by the addition of the alkali KAl(OH)₄-rich admixture is mainly the result of the precipitation of CH plates and amorphous KCASSH hydrates. In this case, the crystallization of elongated ettringite rods contributes to a smaller extent to the setting.

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The influence of alkali-free and alkaline shotcrete accelerators within cement systems - I. Characterization of the setting behavior

Paglia, C. / Wombacher, F. / Bohni, H.

The influence of alkali-free and alkaline accelerators on the setting behavior of cementitious mixtures is investigated. The aluminium sulfate present in the alkali-free accelerators promotes the crystallization of ettringite prisms (2-7 my m) between the clinkers, thus connecting them in a compact mass and accelerating the setting. The very rapid setting promoted by the addition of the alkali KAl(OH)₄-rich admixture is mainly the result of the precipitation of CH plates and amorphous KCASSH hydrates. In this case, the crystallization of elongated ettringite rods contributes to a smaller extent to the setting.

The influence of alkali-free and alkaline shotcrete accelerators within cement systems - I. Characterization of the setting behavior

Paglia, C. / Wombacher, F. / Bohni, H.

The influence of alkali-free and alkaline accelerators on the setting behavior of cementitious mixtures is investigated. The aluminium sulfate present in the alkali-free accelerators promotes the crystallization of ettringite prisms (2-7 my m) between the clinkers, thus connecting them in a compact mass and accelerating the setting. The very rapid setting promoted by the addition of the alkali KAl(OH)₄-rich admixture is mainly the result of the precipitation of CH plates and amorphous KCASSH hydrates. In this case, the crystallization of elongated ettringite rods contributes to a smaller extent to the setting.

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Title:

The influence of alkali-free and alkaline shotcrete accelerators within cement systems - I. Characterization of the setting behavior

Contributors:

Paglia, C. (author) / Wombacher, F. (author) / Bohni, H. (author)

Published in:

Cement and Concrete Research ; 31 ; 913-918

Publication date:

2001

Size:

6 Seiten, 13 Quellen

ISSN:

DOI:

https://doi.org/10.1016/S0008-8846(01)00509-9

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Alkalinität , Aluminiumhydroxid , chemische Fällung , amorpher Stoff , Hydrat , Kristallisation , Ettringit , Abbindebeschleuniger , Wasserabbinden von Zement , Additiv , alkalisches Medium , Kaliumhydroxid , Aluminiumsulfat , Spritzbeton

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