Speaker
Summary
Radioactive Liquid Organic Waste (RLOW) presents a significant management challenge due to its complex physico-chemical properties, often requiring additional treatment steps prior to conditioning, resulting in high pre-disposal and disposal costs. Alkali-activated geopolymers (GPs) offer a promising alternative for the direct conditioning of RLOW. These materials, formed by activating aluminosilicate precursors with alkaline solutions, produce a robust silica-alumina network that is less affected by the presence of organic waste in its mechanical properties and durability. A metakaolin-based GP matrix developed during the H2020-PREDIS project demonstrated good mechanical and thermal performance but exhibited cracking and disintegration upon water immersion. In the current work, a modified metakaolin-based geopolymer incorporating additives has been developed for RLOW immobilization, showing improved immersion stability and promising mechanical strength and leaching resistance.
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