Abstract
In Japan, bridges constructed during the strong economic growth era are facing an aging problem and advanced maintenance methods have become strongly required recently. To meet this demand, we develop the on-site inspection system using 950 keV/3.95 MeV X-band (9.3 GHz) linac X-ray sources. These systems can visualize in seconds the inner states of bridges, including cracks of concrete, location and state of tendons (wires) and other imperfections. At the on-site inspections, 950 keV linac exhibited sufficient performance. But, for thicker concrete, it is difficult to visualize the internal state by 950 keV linac. Therefore, we proceeded the installation of 3.95 MeV linac for on-site bridge inspection. In addition, for accurate evaluation, verification on the parallel motion CT technique and FEM analysis are in progress.
Highlights
AND OBJECTIVEIn Japan, many concrete bridges are facing aging problems
The experiments using 950 keV linac were conducted to scan the bottom flange of the bridge
We succeeded in visualizing the internal structure of bridge in on-site inspection using 950 keV linac
Summary
AND OBJECTIVEIn Japan, many concrete bridges are facing aging problems. Potential deteriorations are periodically inspected visually. Low energy X-ray sources, which is up to 300 keV, have been used for on-site concrete structure inspection. Our research objective is to apply 950 keV/3.95 MeV linac for on-site bridge inspection, which makes it possible to inspect thicker concrete briefly.
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