[3A13-16] Stabilization & Immobilization 6

[3A15] A geopolymer for solidification of radioactive waste

(7)Evaluation method for a geopolymer soundness

*Eiki Adachi¹, Nobuyuki Sekine¹, Marcela Brazsekova², Maros Juraska², Milena Prazska² (1. Fuji Electric, 2. Jacobs Slovakia)

Keywords:Geopolymer, soundness, compressive strength, Weibull distribution

We are investigating an accelerated aging method to evaluate a geopolymer soundness after long-term exposure to water. This time, we evaluated the heating time dependence of the uniaxial compressive strength distribution after exposure to heated water. As a result, as the heating time increased, the strength distribution gradually approached the exponential distribution (m = 1) from the Weibull distribution (shape coefficient m = 4.64) as the strength decreased. In the exponential distribution, the fracture frequency is maximized at zero strength, so it can be said that the soundness is lost when m = 1. Since the cause of the decrease in m might be the geopolymer component elusion, we can estimate the soundness after long-term exposure to water from the temperature dependence of the elusion rate.