CHLORIDE ION BINDING CAPACITY OF TETRACALCIUM ALUMINOFERRITE

The hydration of aluminoferrites and their mixture with gypsum (up to 10/5ratio) was investigated as well as their chloride binding capacity (afterimmersion in 10% NaCl solution) by thermal tests (DTG and TGA) and X-raydiffraction. In this first part, C4AF has been investigated,to be followed by C6A...

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Published inPeriodica polytechnica. Civil engineering. Bauingenieurwesen Vol. 44; no. 2; pp. 135 - 150
Main Authors Csizmadia, Jolán, Balázs, György, Tamás, Ferenc D
Format Journal Article
LanguageEnglish
Published Budapest Periodica Polytechnica, Budapest University of Technology and Economics 2000
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Summary:The hydration of aluminoferrites and their mixture with gypsum (up to 10/5ratio) was investigated as well as their chloride binding capacity (afterimmersion in 10% NaCl solution) by thermal tests (DTG and TGA) and X-raydiffraction. In this first part, C4AF has been investigated,to be followed by C6AF2 and C6A2Fin the second part. Hydration products of C4AF are similarto that of C3A, but amorphous AH3 and/or FH3 are formed,and the transformation ofmetastable (hexagonal hydrates) to the stable (hydrogarnet) phase is slower. Incase of C4AF + gypsum mixtures, monosulfate was found priorto the total exhaustion of gypsum. After salt treatment, iron-containing Friedel´s salt orKuzel´s salt was found. Characteristics of DTG peaks are described andinterpreted.
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ISSN:0553-6626
1587-3773