Formation of chabazite in mixes of calcium aluminate cement and silica fume used for caesium immobilization

Autor:	H. Fryda, A. Capmas, Philippe Boch, R. Ollitrault-Fichet, G. Vetter
Rok vydání:	1996
Předmět:	Cement Chabazite Materials science Silica fume Aluminate Inorganic chemistry chemistry.chemical_element Building and Construction Thermal treatment chemistry.chemical_compound chemistry Caesium General Materials Science Cementitious Hydrate
Zdroj:	Advances in Cement Research. 8:29-39
ISSN:	1751-7605 0951-7197
DOI:	10.1680/adcr.1996.8.29.29
Popis:	The immobilization of caesium with a mix of calcium aluminate cement (CAC) and silica fume (SF) was studied at 50°C. The presence of caesium within the hydration solution leads to the formation of a zeolitic phase of the chabazite family, which immobilizes caesium within the cementitious mix. A severe leach test shows that the immobilization is efficient. Chabazite is also formed when a Cs solution is in contact with an already hydrated CAC-SF mix. The structure of zeolites involves ceramic bonds that are more stable with heat treatment than hydrate bonds, which explains why chabazite is not destroyed by heat treatment at a temperature as high as 750°C. The presence of chabazite is therefore interesting for any application that requires thermal treatment.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::d605a53fc68e7615409bff8cbdb7fae5 https://doi.org/10.1680/adcr.1996.8.29.29 Zobrazit plný text záznamu