Stabilization/solidification of hazardous and radioactive wastes with alkali-activated cements
In: Journal of hazardous materials, Jg. 137 (2006), Heft 3, S. 1656-1663
academicJournal
- print, 62 ref
Zugriff:
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
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Autor/in / Beteiligte Person: | CAIJUN, SHI ; FERNANDEZ-JIMENEZ, A |
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Zeitschrift: | Journal of hazardous materials, Jg. 137 (2006), Heft 3, S. 1656-1663 |
Veröffentlichung: | Amsterdam: Elsevier, 2006 |
Medientyp: | academicJournal |
Umfang: | print, 62 ref |
ISSN: | 0304-3894 (print) |
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