Presentation Information
[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.