中性子ラジオグラフィによるコンクリートのひび割れ部における水分挙動の可視化及び定量化に関する研究

Visualization and quantification of water behavior around cracks by neutron radiography

兼松 学*; 野口 貴文*; 丸山 一平*; 飯倉 寛  

Kanematsu, Manabu*; Noguchi, Takafumi*; Maruyama, Ippei*; Iikura, Hiroshi

非破壊可視化・定量化技術の一つである中性子ラジオグラフィを用い、コンクリートのひび割れ中の水分挙動の可視化及び定量化を目的とした基礎的な研究を行った。ペーストを用い本手法の定量精度確認した後、ひび割れ部の水分挙動の可視化を試みた。その結果、ひび割れ部及びマトリクス中に移動する水分挙動を高解像能で可視化・定量化可能であることが明らかとなった。

Neutron radiography is one of the non-destructive methods. In this research, neutron radiography was applied to visualize and quantify the water penetration into concrete through cracks. The radiographs were obtained by the TNRF (Thermal Neutron Radiography Facility) installed at a research reactor, JRR-3M, in the Japan Atomic Energy Agency (JAEA). The quantitative capability of neutron radiography for the water content and the penetration depth in cement paste specimen were confirmed. The effects of crack and water content on the velocity and the depth of water penetration into concrete were visualized with several concrete specimens, to which surface water was supplied through the container.