Evaluation of reinforced concrete of foundations and concrete towers of transmission lines 230 kV by high energy computed radiography system with betatron

摘要

In the present study, aiming to evaluate integrity of thick rebar reinforced concrete structure used in the overhead high voltage transmission lines, a system of high energy X-ray from betatron of 7.5 MeV and a high sensivity and large dynamic range radiographic image detector Imaging Plate (IP) was tested as a high spatial resolution digital radiography. Two types of rebar reinforced concrete structures were prepared to be similar to those found in the field of overhead transmission lines of 230 kV for laboratory testing with the high energy the computed radiography system: reinforced concrete undercut pyramid foundations of the self standing of steel structure towers with square section of 600 mm × 600 mm and stub in the middle; and rebar reinforced concrete of square section of 200 mm × 200 mm used in concrete tower. In order to reduce the effect of scattering radiation from the specimens, copper and lead filters were tested. The X-ray energy used in the testing was in range of 2.5 MeV to 7.5 MeV. To enhance details of region of interest of radiographic imagens, mathematical filters were employed such as Laplacian of Gaussian (LoG) filter. The results of testing are reported.