ABSTRACT. The major challenges in road infrastructure studies are related to the evaluation of the road pavement quality in a practical, non-destructive, and low-cost way. Information about the thickness of the layers is fundamental to pavement repairing. In this study, the applicability of the ground penetrating radar (GPR) method in the delimitation of the pavement layer is tested at the Shallow Geophysical Test Site Applied to Engineering of Universidade Estadual de Goiás (UEG). The ground penetrating radar presents satisfactory results, identifying the top and bottom of the first five layers by the 270, 400, and 900 MHz antennas. The 2 GHz antenna was able to only delimit the top and bottom of the Hot Rolled Asphalt (HRA). The geomembrane with geotextile set and the concrete layer were not identified in the radargrams. The resolution of each antenna is 9.8 cm for 270 MHz; 6.0 cm for 400 MHz; 2.9 for 900 MHz; and 1.6 cm for 1600 MHz. Concerning layer thickness estimates, the antennas had an efficiency percentage of 83 % (270 and 1600 MHz), 83.29 % (400 MHz), and 84.40 % (900 MHz). Layer thickness estimates obtained by GPR antennas were compared with true thickness using a paired t-test (α= 0.05). No significant differences in layer thickness were observed for the GPR antennas versus the actual pavement thickness.Keywords: GPR; geosynthetics; road investigation; shallow geophysical test site; non-destructive testing.
The state of Mato Grosso (MT) is the fifth largest gold producer in Brazil, with much of it coming from the Baixada Cuiabana region. In this region, gold occurs in primary deposit associated with quartz veins and their host metasedimentary rocks of the Cuiabá Group and secondary sedimentary deposits (such as colluviums, alluviums and eluviums), the latter being quite profitable and easy to exploit. The gold exploitation in these areas often results in deforestation of the Pantanal biome, as mining uses random subsoil scarification to locate the deposits. In this study, the Ground Penetrating Radar (GPR) geophysical method was applied to differentiate and locate alluvial, colluvial and eluvial deposits. This may help to mitigate the local deforestation process. Thus, the acquisition of GPR data took place in a gold mine located in the municipality of Nossa Senhora do Livramento. The GPR recordings were done with a 200 MHz shielded antenna, along with ditches and gravel exposures. The results show variability of the electromagnetic wave velocity between 0.085 to 0.146 m/ns, with normalized amplitudes of -1 to 1 ranging between maximum values of -0.8 and 0.8. The lowest velocity values were found for gravels of alluvial origin. The intermediate velocity of 0.090 m/ns is associated with eluviums and the highest velocity (0.146 m/ns) is associated with gravel of colluvial origin. GPR was efficient to distinguish secondary sedimentary deposits in the Baixada Cuibana, becoming a prospective alternative for the region.
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