[1M05-12] Environmental Radioactivity 1

[1M05] Characterization and Investigation on Long-term Stability of Sodium Activated Metakaolin-Based Geopolymers

*Anil Can Yildirim¹, Takumi Saito¹, Kanako Toda¹ (1. UTokyo)

Keywords:Metakaolin, Geopolymer, Long Term Stability, Seawater

Geopolymer is a group of newly derived barrier materials for the stabilization of radioactive wastes. In this study, we characterized the sodium activated metakaolin based geopolymer (Na-MKGP) including base material, metakaolin, and additionally treated sample which is stated as treated Na-MKGP. Furthermore, the long-term stabilities of the Na-MKGP samples were investigated as a function time in order to see their dissolution and mineralogical and structural changes. Stability assessment experiments were conducted for 6 months in three aqueous systems: the seawater system(SWS), the distilled water system(DWS), and the washed sample system(WSS) where the solid samples were studied with Fourier transformed infrared spectroscopy (FT-IR), Raman spectroscopy, X-ray diffraction (XRD), X-ray fluorescence (XRF), while the liquid samples were measured by inductive coupled plasma-optical emission spectroscopy (ICP-OES).