title: Immobilization of low and intermediate level of organic radioactive wastes in cement matrices.
abstract: 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).
authors.affiliation: Radioisotopes Department, Atomic Energy Authority, Dokki, Cairo, Egypt.
authors.forename: S B
authors.initials: SB
authors.lastname: Eskander
authors.forename: S M
authors.initials: SM
authors.lastname: Abdel Aziz
authors.forename: H
authors.initials: H
authors.lastname: El-Didamony
authors.forename: M I
authors.initials: MI
authors.lastname: Sayed
mesh_terms: D000538:Aluminum Silicates; D000077215:Clay; D003252:Construction Materials; D005615:Freezing; D009930:Organic Chemicals; D011850:Radioactive Waste; D012037:Refuse Disposal; D012588:Scintillation Counting
chemical_list: D000538:Aluminum Silicates; D009930:Organic Chemicals; D011850:Radioactive Waste; D000077215:Clay