[en] The solidification of spent ion exchange resins from the nuclear fuel cycle in a grout matrix as a means of disposing of this waste has many advantages in terms of process simplicity and economy, but associated with the process is the potential for water, cement, and resins to interact and degrade the integrity of the wasteform. The authors describe the encapsulation of beaded anion exchange resin in grout formulations containing ground granulated blast furnace slag, portland cement, and additives (clays, amorphous silica, and flyash). Cured wasteforms are evaluated against the ANS/ANSI 16.1 procedure for leachability of nitrate ion, and against durability tests (including water immersion, compressive strength, freezing/thawing, and wetting/drying procedures). Limited data are also presented for resin waste solidifed in a vinyl ester styrene matrix