ABSTRACT
In this paper, we report on the on-site stress measurement of steel reinforcement (rebar) using portable X-ray diffraction system for concrete structures. First, we carried out the fundamental fulling test on rebars and confirmed that the X-ray system exhibits almost identical values of applied load for rebars. Then, the residual strain was also identified regarding the rebars which was loaded over its yielding stress. The stress of rebars embedded in concrete girders is finally evaluated by the system. Consequently, it is found that the system could assess the absolute values of stress rebars with some accuracy.
