Secondary liquid wastes contain radioactive technetium, which is volatilized during high-temperature processing used for vitrification. A solidified cementitious waste form was developed to immobilize the radioactive secondary waste. This research focuses on the performance of a cementitious waste form called Cast Stone. Properties including compressive strength, surface area, phase composition, and technetium leaching were measured. The results indicate that technetium diffusivity was affected by simulant type. Ettringite and AFm were formed during hydration. Cast Stone passed the qualification requirements for a secondary waste form, which are compressive strength of 3.45 MPa and technetium diffusivity of 10-9cm2/sec. Cast Stone was found to be a good candidate for immobilizing secondary waste.
Revised: November 11, 2011 |
Published: January 1, 2012
Citation
Chung C., W. Um, M.M. Valenta, S.K. Sundaram, J. Chun, K.E. Parker, and M.L. Kimura, et al. 2012.Characteristics of Cast Stone Cementitious Waste Form for Immobilization of Secondary Wastes from Vitrification Process.Journal of Nuclear Materials 420, no. 1-3:164-174.PNNL-SA-78535.doi:10.1016/j.jnucmat.2011.09.021