Evaluation of ground penetrating radar responses to changes in crushed stones pavement layers characteristics
DOI:
https://doi.org/10.58922/transportes.v31i1.2770Keywords:
GPR-Ground Penetranting Radar, Crushed stone, Moisture, Quality controlAbstract
This paper presents the study of ground penetrating radar responses to changes in the following characteristics of crushed stones for pavement layers: particle size composition and bulk density. For the execution of the tests was used a ground coupled shielded antenna, with a central frequency of 1.6 GHz, coupled to a control and data storage unit. In order to evaluate the sensitivity of GPR to variations in granulometric composition particle size, two materials were compared, one dense graded and one open graded, respectively, the B gradation from DNIT Specification 141/2010 – ES and the drainage layer gradation from DER/SP specification ET-DE-P00 / 008., which were compacted in a 40 × 40 × 15 cm wooden box made for this purpose. In order to assess the sensitivity to variations in apparent density, surveys were carried out with both mixtures under the following conditions: moisture content varying ± 1.0% in relation to the optimum humidity; uncompacted and compacted to 90%; 95%; 98% and 100% of the Modified Proctor. In all tests, the objective was to detect variations in the relative dielectric permittivity and to relate it to the granulometry and the conditions of compaction of the mixtures. The results obtained demonstrate that due to the low contrast between the physical properties of the two mixtures compared, the ground penetrating radar was not able to differentiate them and that it is sensitive to variations in the saturation conditions, but that this sensitivity is not sufficient for it to be used as a replacement for traditional methods of quality control in the execution of granular layers, but indicate that it can come to be used to identify heterogeneities in the executed layers.
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