2025 Volume 36 Issue 2 Pages 139-146
In order to estimate the yield of H2 from blast furnace cement type B containing radioactive materials, and from geopolymer hardened bodies, we irradiated and stored samples at temperatures different from room temperature to 90 ℃ to simulate decay heat. We then calculated the integrated GH2 value over a period of four weeks from the time of irradiation. The results of this study indicate that, in the case of cement, the H2 evoluted during γ-ray irradiation was seen to diffuse within the sample body and is released outside the test body. The integrated GH2 value reached 0.45 for the test body irradiated and stored at 90 ℃, and it was not possible to confirm that the release had finished after 4 weeks of irradiation. In addition, when melted fly ash was mixed in, the value increased by about 4 times. It was ascertained that H2 is generated from chemically bound water in the hardened body, exhibiting a larger GH2 than liquid water. In contrast, even at room temperature, with a maximum GH2 value of 0.2, geopolymer exhibited a distinct behavior, wherein all H2 was released from the test body immediately after irradiation. The introduction of melted fly ash resulted in the restriction of diffusion within the test body, however, did not lead to an increase in GH2, as observed in the case of the cement.
