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Leaching of Cesium from a Cement Matrix

Published online by Cambridge University Press:  26 February 2011

B. Torstenfelt and
G. Hedin
B. Torstenfelt
Affiliation:
ABB ATOM AB, S-721 63 Vasteras, Sweden
G. Hedin
Affiliation:
ABB ATOM AB, S-721 63 Vasteras, Sweden
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Abstract

The leaching rate of cesium has been studied in cement. The solidification matrix was a standard Portland cement with increased sulphate resisting properties mixed with 300 kg/m3 or 350 kg/m3 powdered ion exchange resins, and with or without 5 weight-% zeolite added to the grout. The leaching rates from an ordinary cement matrix and a cement matrix mixed with zeolite were measured to be (1.3 to 2.6)×10–7 kg/m2s and (1.6 to 2.1)×10−8 kg/m2s, respectively. From the leaching data the apparent diffusivity of cesium in an ordinary cement matrix with a waste load of 300–350 kg/m3 powdered ion exchange resins was measured to be (0.6 to 1.3)×10−10 m2/s, and in a cement matrix mixed with 5 weight-% zeolite and the same waste load, the diffusivity was measured to be (0.8 to 1.0)×10−12m2/s.

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References

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