[3M09-13] Material

3:00 PM - 3:15 PM JST(6:00 AM - 6:15 AM UTC)

[3M10] G_H2 of hardened blast cement paste irradiated by γ-raysEffects of irradiation and holding temperature, and introduction of fly ash

*Jun Kumagai¹, Kazuo Yamada², Kazuto Endo² (1. Nagoya Univ., 2. NIES)

Keywords:

radiation chemical yield,molecular hydrogen production,hardened blast cement paste,decay heat,introduction of fly ash

The effects of decay heat and fly ash introduction on H₂ eveolution from stabilized specimens with hardened blast cement paste were traced over a 4-week period after γ-ray irradiation to determine G_H2. The results showed that H₂ continued to be evoluted outside the specimens for 4 weeks and was almost the same as the G_H2 of liquid water when stored at 90°C. On the other hand, when 37% fly ash was introduced, G_H2 reached about four times higher than that without fly ash at 90°C, even though there was no source of H₂ in the fly ash itself. It is considered that the destabilization of the crystalline water in the crystals constituting the hardened cement paste by the introduction of fly ash contributes to the increase in G_H2.