| The on-site none-destructive evaluation (NDE) system using X-ray and Neutron sources has been developed for inspecting post-tensioned PC structures to evaluate the residual bearing capacity of post-tensioned PC structures having several defaults such as corrosion and breakage of rebars and strands. In this system, the lo-cations and sizes of voids or wires are detected with an special accuracy of 1mm by partial angle computer tomography (CT) or Tomosynthesis technique using portable 950 keV/3.95 MeV X-band (9.3GHz) linear ac-celerator x-ray sources. The X-ray system was verified with actual bridge members in on-site testing, which is the first trial in Japan for actual utilization of X-band X-ray sources on-site. The Neutron source imaging sys-tem can identify water inside the concrete or even in the duct, and the large-scale detector has been developed for in-suit evaluation. |
