Solidification and stabilization of strontium and chloride ions in thermally treated calcium aluminate cement modified with or without sodium polyphosphate

Cementation of aqueous radioactive waste contaminated with a significant 90Sr is challenging due to the potential radiolysis water contents. Utilization calcium aluminate cement (CAC) modified sodium polyphosphate (CAP) interesting as its content can be reduced by thermal treatment. The present study investigated solidification and stabilization Sr2+ Cl− ions in CAC CAP or without A leaching test showed superior ion CAP: apparent diffusion coefficient was smaller than 5 orders magnitude. cured at 20 °C had best for among samples tested. Friedel's salt formed may have contributed immobilization ions. significantly improved treatment likely because improvement microstructure previously reported.