Dr. Kanako Toda

Research Associate

The University of Tokyo

My research focuses on the development of cementitious and geopolymer-based materials for the safe immobilization of radioactive waste. I investigate how microstructure, pore evolution, and geochemical interactions influence long-term durability and radionuclide retention. In particular, I study metakaolin-, fly ash-, and slag-based geopolymers to clarify mechanisms underlying radionuclide immobilization. By integrating scattering techniques, diffusion analysis, and synchrotron-based spectroscopy with numerical and geochemical modeling, I link material chemistry to sorption and diffusion behavior, establishing a predictive understanding of radionuclide transport. Through a multiscale and interdisciplinary approach, I aim to develop frameworks that predict the behavior of radionuclides in engineered barriers while simultaneously advancing sustainable construction technologies. Extending from my PhD work, I also explore the reuse of dredged soils and steel slag as sustainable construction materials. My research focuses on the role of organic matter in the strength development of the mixture of the two materials and examines the geochemical interactions between organic and inorganic components. It leads to innovating the time-consuming evaluation of the strength development of the mixture, to the on-site quick examination for the strength development potential. My work contributes to both safe nuclear waste management and the promotion of environmentally responsible material reuse, combining fundamental insights with practical applications.