For the land storage of solidified radioactive wastes with cement, their volume must be minimized with keeping a sufficient strength.
Generally, the material strength and the volume of a solidified waste are dependent on the composition of mixed waste, cement and water, however, their relationships have not been investigated yet.
In this report, Volume Factor (V. F.) was defined as the volumetric increase of solidified waste, and the value of V. F. and the strengh were determined experimentally for the various compositions of radioactive wastes, cement and water.
The experimental results were illustrated graphically for the handy use of practical estimations of V. F. and the strength of solidified radioactive wastes with cement.