[2C01-07] 照射効果1

[2C02] Ion irradiation-induced changes in the properties of rock-forming minerals of concrete aggregates at high fluences

*Nhut Vu Luu^1,5, Kenta Murakami¹, Hamza Samouh², Ippei Maruyama², Sho Kano³, Kiyoteru Suzuki⁴ (1. Nagaoka University of Technology, 2. Nagoya University, 3. The University of Tokyo, 4. Mitsubishi Research Institute, 5. Vietnam Atomic Energy Institute)

キーワード：irradiation damage, amorphization, nanoindentation, cavity, silicate minerals

Radiation-induced volume expansion (RIVE) in rock-forming minerals of concrete aggregates is a primary cause of long-term degradation of concrete structure, due to crystal to amorphous transformation. However, the changes in their properties were not clearly understood, especially at high fluence. For this reason, crystal quartz and two feldspars (albite and microcline) were irradiated with 3MeV Si²⁺ irradiation, following step height measurement and nano-indentation to quantify the change in volume and mechanical properties. The results indicated fluence dependence of RIVE was similar in quartz and feldspars, but the mechanism of expansion was different depending on alkali ions. The hardness seemed a function of amorphization, while Young’s modulus almost correlated with RIVE. Alkali ions included in minerals could affect both amorphization kinetics and final amorphous structure.