Influence of Doping of NaNO3 on the Solid Phase Thermal Decomposition of Bitumen and Cement |
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Authors: | El-Said N Sayed M S Mikhail A S |
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Institution: | (1) Hot Laboratories and Waste Management Center, Atomic Energy Authority, P.O, 13759 Cairo, Egypt |
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Abstract: | The thermal stability of solidified NaNO3 salts in bitumen and cement has been investigated for safety considerations in the field of solidification of radioactive
waste. The thermal decomposition of bitumen and cement in presence of NaNO3 in a temperature range 22–650°C has been studied. The fraction decomposed of the pure samples and mixtures showed slow linear
reactions followed by acceleratory and decay stages. Data are analyzed according to both Freeman-Carroll and Coats-Redfern
kinetics to evaluate the activation energy and the order of reactions of all mixtures. It is found that the activation energies
of bitumen and cement were 594 and 203 kJ mol-1, respectively. The order of reactions of bitumen and cement was 2 and 4, respectively. The addition of NaNO3 shortens the duration of the induction period in all mixtures. It was concluded that solidification of radioactive waste
containing NaNO3 in bitumen and cement should be applied in the temperature range 22–300°C. At temperature higher than300°C
solidification should be in cement.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | bitumen portland cement safety considerations solidification thermal stability |
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