Formation of calcium sulfoaluminate hydrate compounds: Part I: Fid-Bau Portal

Fachinformationsdienst BAUdigital

A platform for research: civil engineering, architecture and urbanism

Formation of calcium sulfoaluminate hydrate compounds: Part I

Clark, B.A. / Brown, P.W.

The formation of ettringite (3CaO dot Al₂O₃ dot 3CaSO₄ dot 32H₂O) and monosulfate (3CaO dot Al₂O₃ dot CaSO₄ dot 12H₂O) from tricalcium aluminate (3CaO dot Al₂O₃) and gypsum (CaSO₄ dot 2H₂O) in sodium hydroxide (NaOH) solutions was investigated by isothermal calorimetry and X-ray diffraction analyses. Tricalcium aluminate/gypsum mixtures with a molar aluminate-to-sulfate ratio of 1:3 were hydrated at constant temperatures from 40 to 80 degree C in deionized water and 200 and 500 mM of NaOH solutions. Ettringite was the only crystalline phase ultimately formed between 40 and 80 degree C, regardless of whether hydration was carried out in deionized water or sodium hydroxide solutions. The rates of ettringite formation were retarded in sodium hydroxide solutions at all temperatures when compared to hydration in deionized water. The apparent activation energy for the conversion of the tricalcium aluminate/gypsum mixture to ettringite was observed to depend on the concentration of sodium hydroxide.

Access

Check availability in my library

Order at Subito €

Page navigation

Document information

Export, share and cite

Formation of calcium sulfoaluminate hydrate compounds: Part I

Clark, B.A. / Brown, P.W.

The formation of ettringite (3CaO dot Al₂O₃ dot 3CaSO₄ dot 32H₂O) and monosulfate (3CaO dot Al₂O₃ dot CaSO₄ dot 12H₂O) from tricalcium aluminate (3CaO dot Al₂O₃) and gypsum (CaSO₄ dot 2H₂O) in sodium hydroxide (NaOH) solutions was investigated by isothermal calorimetry and X-ray diffraction analyses. Tricalcium aluminate/gypsum mixtures with a molar aluminate-to-sulfate ratio of 1:3 were hydrated at constant temperatures from 40 to 80 degree C in deionized water and 200 and 500 mM of NaOH solutions. Ettringite was the only crystalline phase ultimately formed between 40 and 80 degree C, regardless of whether hydration was carried out in deionized water or sodium hydroxide solutions. The rates of ettringite formation were retarded in sodium hydroxide solutions at all temperatures when compared to hydration in deionized water. The apparent activation energy for the conversion of the tricalcium aluminate/gypsum mixture to ettringite was observed to depend on the concentration of sodium hydroxide.

Formation of calcium sulfoaluminate hydrate compounds: Part I

Clark, B.A. / Brown, P.W.

The formation of ettringite (3CaO dot Al₂O₃ dot 3CaSO₄ dot 32H₂O) and monosulfate (3CaO dot Al₂O₃ dot CaSO₄ dot 12H₂O) from tricalcium aluminate (3CaO dot Al₂O₃) and gypsum (CaSO₄ dot 2H₂O) in sodium hydroxide (NaOH) solutions was investigated by isothermal calorimetry and X-ray diffraction analyses. Tricalcium aluminate/gypsum mixtures with a molar aluminate-to-sulfate ratio of 1:3 were hydrated at constant temperatures from 40 to 80 degree C in deionized water and 200 and 500 mM of NaOH solutions. Ettringite was the only crystalline phase ultimately formed between 40 and 80 degree C, regardless of whether hydration was carried out in deionized water or sodium hydroxide solutions. The rates of ettringite formation were retarded in sodium hydroxide solutions at all temperatures when compared to hydration in deionized water. The apparent activation energy for the conversion of the tricalcium aluminate/gypsum mixture to ettringite was observed to depend on the concentration of sodium hydroxide.

Access

Check availability in my library

Order at Subito €

Page navigation

Document information

Export, share and cite

Document information

Title:

Formation of calcium sulfoaluminate hydrate compounds: Part I

Contributors:

Clark, B.A. (author) / Brown, P.W. (author)

Published in:

Cement and Concrete Research ; 29 ; 1943-1948

Publication date:

1999

Size:

6 Seiten, 25 Quellen

ISSN:

DOI:

https://doi.org/10.1016/S0008-8846(99)00200-8

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Hydratisieren , Temperatureinfluss , Aktivierungsenergie , Röntgenbeugung , Röntgenanalyse , Kalorimetrie , Dauerhaftigkeit , Ettringit , Tricalciumaluminat , Natriumhydroxid , anorganische Verbindung , Gips

Similar titles

Formation of calcium sulfoaluminate hydrate compounds. Part II

Clark, B.A. / Brown, P.W. | Tema Archive | 2000

The formation of calcium sulfoaluminate hydrate compounds

Clark, B.A. | Online Contents | 1999

The formation of calcium sulfoaluminate hydrate compounds

Clark, B.A. | Online Contents | 2000

The formation of calcium sulfoaluminate hydrate compounds

Clark, B. A. / Brown, P. W. | British Library Online Contents | 2000

The formation of calcium sulfoaluminate hydrate compounds - Composition of solutions and nature of solid phases

Clark, B.A. / Brown, P.W. | British Library Online Contents | 1999