[3C09-14] Material

[3C10] Radiolysis hydrogen yields of cement constituent crystals

Effect of irradiation temperature on the G_H2

*Jun Kumagai¹, Keisuke Hosomi², Shinya Hasegawa³, Kumi Negishi³, Masaya Ida³ (1. IMaSS, Nagoya Univ., 2. Faculty of Engineering, Nagoya Univ., 3. Taiheiyo Consultant)

Keywords:radiolysis hydrogen yield, cement constituent crystals, crystallization water, gamma-ray

Four single crystals of C-S-H, Ca(OH)₂, ettringite, and monosulfate, which constitute cement, were γ-irradiated in the temperature range from room temperature to 90°C, and the radiolytic hydrogen production yield G_H2 was measured. The G_H2of these crystals was about 0.3 to 0.5 at room temperature, and that of the cement obtained from the constituent crystal ratio was estimated to be 0.3. When the irradiation temperature was 90°C, the G_H2 of all crystals was about 10% higher than that at room temperature. From these results, it is estimated that when crystalline water in cement is irradiated by γ-rays, molecular hydrogen is produced at a yield of about 2/3 of that of liquid water, and the yield increases with increasing irradiation temperature.