Immobilization of low and intermediate level of organic radioactive wastes in cement matrices.

S B Eskander, S M Abdel Aziz, H El-Didamony, M I Sayed

Radioisotopes Department, Atomic Energy Authority, Dokki, Cairo, Egypt.

Journal of hazardous materials 2011 Jun 15

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The adequacy of cement-clay composite, for solidification/stabilization of organic radioactive spent liquid scintillator wastes and its resistance to frost attack were determined by a freezing/thawing (F/T) test. Frost resistance is assessed for the candidate cement-clay composite after 75 cycles of freezing and thawing by evaluating their mass durability index, compressive strength, apparent porosity, volume of open pores, water absorption, and bulk density. Infrared (IR), X-ray diffraction (XRD), differential thermal analysis (DTA), thermal gravimetric analysis (TGA) and scanning electron microscopy (SEM) were performed for the final waste form (FWF) before and after the F/T treatment to follow the changes that may take place in its microstructure during the hydration regime. The results were obtained indicate that the candidate composite exhibits acceptable resistance to freeze/thaw treatment and has adequate suitability to solidify and stabilize organic radioactive spent liquid scintillator wastes even at very exaggerating conditions (-50°C and +60°C). Copyright © 2011 Elsevier B.V. All rights reserved.

Citation

S B Eskander, S M Abdel Aziz, H El-Didamony, M I Sayed. Immobilization of low and intermediate level of organic radioactive wastes in cement matrices. Journal of hazardous materials. 2011 Jun 15;190(1-3):969-79