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中性子回折法を用いた鉄筋コンクリートの構造力学研究の取組み

Neutron engineering approach for structural engineering research of reinforced concrete

鈴木 裕士  ; 楠 浩一*; 兼松 学*; Harjo, S.   

Suzuki, Hiroshi; Kusunoki, Koichi*; Kanematsu, Manabu*; Harjo, S.

中性子応力測定技術は、中性子線の回折現象を応用した応力・ひずみ測定技術であり、材料深部の応力・ひずみを非破壊・非接触で測定できる特長を有する。著者らは、世界で初めて鉄筋コンクリートの構造力学研究に中性子回折法を応用し、普通強度コンクリートに埋設された鉄筋について、十分な精度でひずみ分布測定が可能であることを実証するとともに、コンクリートのひび割れや鉄筋腐食に伴う付着劣化の評価を可能にした。中性子回折法の応用は、鉄筋コンクリートの構造力学研究に新たな知見を与えるものと期待される。

Neutron diffraction, which is a nondestructive and noncontact method for strain measurement, was applied to the strain measurement of rebar in the reinforced concrete. The three-dimensional deformation behavior of the embedded rebar including the axial and transverse strains was accurately measured under pullout loading using time-of-flight neutron diffraction. Furthermore, bond deterioration around the cracks in concrete and that around corroded rebar were successfully observed by measuring the strain distributions along rebar by neutron diffraction. The neutron diffraction technique is expected to be a novel strain measurement method for the rebar embedded in concrete for understanding actual phenomena on reinforced concrete structures.

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