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Stability of Cs-Ionsiv in Portland cement blends for radioactive waste disposal

Hyatt, Neil C. / Jenni, Andreas / Stennett, Martin C.

The suitability of Portland cement blends for encapsulation of Cs-Ionsiv in a monolithic wasteform was investigated. No evidence of reaction or dissolution of the Cs-Ionsiv in the cementitious environment was found by scanning electron microscopy and X-ray diffraction. However, a small fraction (<= 1.6 weight-%) of the Cs inventory was released from the encapsulated lonsiv during leaching experiments carried out on hydrated samples. Cs release was enhanced by exchange of K and Na present in the cementitious pore water. Cement systems lower in K and Na, such as slag based blends, showed lower Cs release than the fly ash based analogues.

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Stability of Cs-Ionsiv in Portland cement blends for radioactive waste disposal

Hyatt, Neil C. / Jenni, Andreas / Stennett, Martin C.

The suitability of Portland cement blends for encapsulation of Cs-Ionsiv in a monolithic wasteform was investigated. No evidence of reaction or dissolution of the Cs-Ionsiv in the cementitious environment was found by scanning electron microscopy and X-ray diffraction. However, a small fraction (<= 1.6 weight-%) of the Cs inventory was released from the encapsulated lonsiv during leaching experiments carried out on hydrated samples. Cs release was enhanced by exchange of K and Na present in the cementitious pore water. Cement systems lower in K and Na, such as slag based blends, showed lower Cs release than the fly ash based analogues.

Stability of Cs-Ionsiv in Portland cement blends for radioactive waste disposal

Hyatt, Neil C. / Jenni, Andreas / Stennett, Martin C.

The suitability of Portland cement blends for encapsulation of Cs-Ionsiv in a monolithic wasteform was investigated. No evidence of reaction or dissolution of the Cs-Ionsiv in the cementitious environment was found by scanning electron microscopy and X-ray diffraction. However, a small fraction (<= 1.6 weight-%) of the Cs inventory was released from the encapsulated lonsiv during leaching experiments carried out on hydrated samples. Cs release was enhanced by exchange of K and Na present in the cementitious pore water. Cement systems lower in K and Na, such as slag based blends, showed lower Cs release than the fly ash based analogues.

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Title:

Stability of Cs-Ionsiv in Portland cement blends for radioactive waste disposal

Additional title:

Stabilität von Cs-Ionsiv in Portlandzementgemischen für die Lagerung radioaktiver Abfälle

Contributors:

Hyatt, Neil C. (author) / Jenni, Andreas (author) / Stennett, Martin C. (author)

Published in:

MRS Spring Meeting, 2010, Symposium AA, Scientific Basis for Nuclear Waste Management, 34 ; 221-226

Materials Research Society Symposium - Proceedings ; 1265

Publication date:

2010

Size:

6 Seiten, 7 Bilder, 2 Tabellen, 9 Quellen

ISBN:

978-1-60511-242-8

ISSN:

DOI:

https://doi.org/10.1557/PROC-1265-AA06-06

Type of media:

Conference paper

Type of material:

Print

Language:

English

Keywords:

Portlandzement , Verkapseln , radioaktiver Abfall , Rasterelektronenmikroskop , chemische Reaktion , Auflösung , XRD (Röntgenstrahlbeugung) , Hydrat , Ionenaustausch , Cäsiumion , Kaliumion , Natriumion , Porenwasser , Konzentrationseinfluss , Schlacke , Flugasche

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