Nondestructive Testing to Identify Delaminations Between HMA Layers, Volume 3 - Controlled Evaluation Reports (2013) / Chapter Skim
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13 Laboratory and Field Evaluations of Ground-Penetrating Radar Systems This chapter was prepared by Kenneth Maser and the staff of Infrasense, Inc. The following three ground-penetrating radar (GPR)
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14 3d-Radar System The 3d-Radar system was used for slab testing, as shown in Figure 2.3. Note that the system is fairly large for the laboratory scale.
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15 GSSI Systems GSSI tested the 2.6-GHz ground-coupled antenna pair and the prototype 3-GHz horn antenna at the test track. The initial tests used both systems, and the second round of tests focused on the 3-GHz horn.
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16 test track. The second round of tests was conducted March 7–8, 2010, under more favorable field conditions and using the same antenna systems.
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17 converted into a depth slice by using an assumed dielectric constant, which for asphalt is typically between 5 and 6. The depth slices presented by each organization were usually accompanied by supporting B-scan samples for individual lines of data.
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18 Figure 2.8. Time-depth slices at 2 to 3 in.
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19 Figure 2.10. GPR time-depth slices for Sections 4, 5, 6, and 7.
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