[en] For prediction of the long-term properties of concrete used for radioactive waste disposal, we analyzed calcium leaching for various mortar and concrete mixes using 4 binders. Results show that, for mortars using ordinary portland cement and low heat portland cement, there is a drastic change point of CaO/SiO₂ ratio distributions, while for mortars using low alkali cement, there is no clear change point. According to the analysis result for 10,000 years, the leaching widths of mortar of 1,000 years are 64 cm for ordinary portland cement, 55cm for low-heat portland cement, and 39cm for low-alkali cement, all with 45% water-binder ratio. For the mortar, we found that the leaching length was proportional to the square root of the elapsed time. By comparing the analysis results for concrete and mortar, we found that the decrease in CaO/SiO₂ ratio is low and leaching width changes are in the transition band between aggregate and mortar. (author)