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1 results

  • A study on Iodine Release Behavior from Iodine-Immobilizing Cement Solid

  • Yoshiko Haruguchi, Shinichi Higuchi, Masamichi Obata, Tomofumi Sakuragi, Ryota Takahashi, Hitoshi Owada
  • Journal:
    MRS Online Proceedings Library Archive / Volume 1518 / 2012
    Published online by Cambridge University Press:
    23 January 2013, pp. 85-90
    Print publication:
    2012

  • An iodine-immobilizing cement solidification process using calcium aluminate cement with gypsum additive was developed. Powdered cement solid was repeatedly immersed in ion-exchanged water with varying liquid-to-solid ratios (L/S) in accelerated dissolution tests simulating interaction with groundwater at waste disposal sites. The measured concentrations of iodine in the water were on the order of 10−5 to 10−3 mol⋅dm−3 in the entire L/S range. These concentration levels are extremely low compared with those in the case of ordinary Portland cement. Calculations with a solution equilibrium model for the cement immersed in ion-exchanged water showed that the observed iodine release profile versus integrated L/S ratio from the immersion test was explained by a dissolution model of minerals in the cement.