Neutron engineering approach for structural engineering research of reinforced concrete

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

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.