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Stabilization/solidification of hazardous and radioactive wastes with alkali-activated cements

Shi, Caijun / Fernandez-Jimenez, A.

This paper reviews progresses on the use of alkali-activated cements for stabilization/solidification of hazardous and radioactive wastes. Alkali-activated cements consist of an alkaline activator and cementing components, such as blast furnace slag, coal fly ash, phosphorus slag, steel slag, metakaolin, etc., or a combination of two or more of them. Properly designed alkali-activated cements can exhibit both higher early and later strengths than conventional portland cement. The main hydration product of alkali-activated cements is calcium silicate hydrate (C-S-H) with low Ca/Si ratios or aluminosilicate gel at room temperature; C-S-H, tobmorite, xonotlite and/or zeolites under hydrothermal condition, no metastable crystalline compounds such as Ca(OH)2 and calcium sulphoaluminates exist. Alkali-activated cements also exhibit excellent resistance to corrosive environments. The leachability of contaminants from alkali-activated cement stabilized hazardous and radioactive wastes is lower than that from hardened portland cement stabilized wastes. From all these aspects, it is concluded that alkali-activated cements are better matrix for solidification/stabilization of hazardous and radioactive wastes than Portland cement.

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Stabilization/solidification of hazardous and radioactive wastes with alkali-activated cements

Shi, Caijun / Fernandez-Jimenez, A.

This paper reviews progresses on the use of alkali-activated cements for stabilization/solidification of hazardous and radioactive wastes. Alkali-activated cements consist of an alkaline activator and cementing components, such as blast furnace slag, coal fly ash, phosphorus slag, steel slag, metakaolin, etc., or a combination of two or more of them. Properly designed alkali-activated cements can exhibit both higher early and later strengths than conventional portland cement. The main hydration product of alkali-activated cements is calcium silicate hydrate (C-S-H) with low Ca/Si ratios or aluminosilicate gel at room temperature; C-S-H, tobmorite, xonotlite and/or zeolites under hydrothermal condition, no metastable crystalline compounds such as Ca(OH)2 and calcium sulphoaluminates exist. Alkali-activated cements also exhibit excellent resistance to corrosive environments. The leachability of contaminants from alkali-activated cement stabilized hazardous and radioactive wastes is lower than that from hardened portland cement stabilized wastes. From all these aspects, it is concluded that alkali-activated cements are better matrix for solidification/stabilization of hazardous and radioactive wastes than Portland cement.

Stabilization/solidification of hazardous and radioactive wastes with alkali-activated cements

Shi, Caijun / Fernandez-Jimenez, A.

This paper reviews progresses on the use of alkali-activated cements for stabilization/solidification of hazardous and radioactive wastes. Alkali-activated cements consist of an alkaline activator and cementing components, such as blast furnace slag, coal fly ash, phosphorus slag, steel slag, metakaolin, etc., or a combination of two or more of them. Properly designed alkali-activated cements can exhibit both higher early and later strengths than conventional portland cement. The main hydration product of alkali-activated cements is calcium silicate hydrate (C-S-H) with low Ca/Si ratios or aluminosilicate gel at room temperature; C-S-H, tobmorite, xonotlite and/or zeolites under hydrothermal condition, no metastable crystalline compounds such as Ca(OH)2 and calcium sulphoaluminates exist. Alkali-activated cements also exhibit excellent resistance to corrosive environments. The leachability of contaminants from alkali-activated cement stabilized hazardous and radioactive wastes is lower than that from hardened portland cement stabilized wastes. From all these aspects, it is concluded that alkali-activated cements are better matrix for solidification/stabilization of hazardous and radioactive wastes than Portland cement.

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Title:

Stabilization/solidification of hazardous and radioactive wastes with alkali-activated cements

Contributors:

Shi, Caijun (author) / Fernandez-Jimenez, A. (author)

Published in:

Journal of Hazardous Materials ; 137 ; 1656-1663

Publication date:

2006

Size:

8 Seiten, 7 Bilder, 62 Quellen

ISSN:

DOI:

https://doi.org/10.1016/j.jhazmat.2006.05.008

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Zement , alkalische Anregung , Gefahrstoff , radioaktiver Abfall , Verfestigung , Stabilisierung , Auslaugen (Mineralogie) , Sickerwasser , Festigkeit , Portlandzement

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