An Experimental Study on Factors Affecting the Leachability of Cs-137 in Cement Matrix and Leaching Model with Backfill

시멘트 고화체내 Cs-137의 침출능에 영향을 미치는 인자에 대한 실험적 연구와 뒷채움재를 고려한 침출 모델

  • Park, Jong-Kil (Korea Advanced Institute of Science and Technology) ;
  • Lee, Kun-Jai (Korea Advanced Institute of Science and Technology)
  • Published : 1991.12.01

Abstract

Various factors affecting the teachability of Cs-137 in cement matrix have been investigated. Factors investigated include such as pressure curing, vibration curing, pressure leaching, the effect of the clay addition, ion-exchange resin(IRN-77) addition, and $CO_2$or air injection. Leaching experiments were conducted by the method recommended by IAEA. To analyze the experimental results, pore structure analysis of cement matrices was carried out by BET method. Cement matrices may not contact directly with underground water in real repository, since the surroundings of disposed drums are filled with backfill. Thus, the effect of backfill to the teachability has been investigated. The well-known diffusion theory was utilized to predict long term leach rate and cumulative fraction leached of Cs-137 or non-radioactive species.

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