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Abstract  

To assess the safety of disposal of a radioactive waste-cement composite, the leaching of137Cs from a waste composite into a surrounding fluid has been studied. Leaching tests were carried out in accordance with a method recommended by IAEA.1 The leachability was measured as a function of bentonite clay to cement ratio. The fraction of137-Cs leached from a specimen of Portland cement is 0.03–0.13 at a leaching time of 400 d. Results presented in this paper are examples of data obtained in a 10 y mortar and concrete testing project, which will influence the design of the engineered trench system for a future Yugoslav radioactive waste storage center.2,3

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Pehanich J. L., Blankenhorn P. R., Silsbee M. R. Wood fiber surface treatment level effects on selected mechanical properties of wood fiber-cement composites, Cement and Concrete Research , Vol. 34, 2004, pp. 59

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. W, Naaman A. E. (1992), High performance fiber reinforced cement composites. Proceedings of the 1st Int. RILEM/ACI Workshop, Mainz, June 23–26, 1991, Chapman & Hall, London Naaman A. E

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Abstract  

The effect of impregnation time on the physico-chemical and mechanical properties of polyester-cement mortar composite has been investigated. The samples were soaked in unsaturated polyester resin containing 40% styrene monomer at impregnation times ranging from 1–15 hours and then exposed to 50 kGy of γ-irradiation. The effects on polymer loading, compressive strength, apparent porosity, and water absorption in addition to IR spectra and TGA of the samples were studied. It was found that, the polymer loading and compressive strength increase with the increased of soaking time up to 4 hours and there is no significant improvement of the polymer loading and compressive strength increase with the increased of soaking time up to 4 hours and there is no significant improvement of the polymer loading and strength. Whereas, the apparent porosity and water absorption behave in an opposite direction. These are attributed to the presence of polymer in the pores of the samples. IR spectra showed that, new bands appeared as result of the reaction between polyester and set cement. TGA showed that, the polyester cement composite has higher thermal stability as a compared to irradiated polyester.

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cement composites (in Slovak) Zborník recenzovaných vedeckých prác, UEI 2013 , Košice, 2013 , pp. 10 – 20 . [6] Tung

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granules on cement composite properties , Cement and Concrete Composites , Vol. 27 , No. 1 , 2005 , pp. 41 − 47 . [8] Chikhi A. , Belhamri A

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and silicon from cement composites in the aggressive environment , Pollack Periodica, Vol. 9 , No. 2 , 2014 , pp. 123 – 130 . [18] Fiori C. S

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release from injectable PolyDL-lactic-coglycolic acid calcium phosphate cement composites J.Bone Joint Surg. 85-A 75 – 81 . [49]. R. Langer J. P. Vacanti 1993 Tissue engineering Science 260 920 – 927 . [50]. L. G. Griffith G

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