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To assess the safety of disposal of radioactive waste material in cement,  curing conditions and time of leaching radionuclides 137Cs have been studied.  Leaching tests in cement-ion exchange resins-bentonite matrix, were carried  out in accordance with a method recommended by IAEA. Curing conditions and  curing time prior to commencing the leaching test are critically important in  leach studies since the extent of hydration of the cement materials  determines how much hydration product develops and whether it is available to  block the pore network, thereby reducing leaching. Incremental leaching rates  Rn[cm/d] of 137Cs from cement-ion exchange resins-bentonite matrix after 240  days were measured. The results presented in this paper are examples of  results obtained in a 30-year concrete testing project which will influence  the design of the engineer trenches system for future central Serbian  radioactive waste storing centre

Curing time effect on the fraction of 137Cs from cement-ion exchange resins-bentonite clay composition