Nondestructive Testing to Identify Delaminations Between HMA Layers: Phase III–Develop User Guidelines (2014) / Chapter Skim
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RIS Hi-Pave System Specification System Specification Recommended Laptop: Panasonic CF-19 Tough-Book Max. acquisition speed: 260 kmh (150 mph)
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GRED HD 3D Post-processing Software (Data Processing) GRED HD 3D is processing software designed to be an interface for the IDS RIS GPR family of products.
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GPS Compatibility The GPS device can be connected to the RS232 port of the data logger computer and GPS data saved together with radar profiles for knowing the position of each scan in absolute coordinates; the software can accept the GPS streaming from any device compatible with the NMEA standard. The GPS positions can be easily loaded on software like Google Earth.
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APPENDIX C1 SASW/IE User Guidelines C1
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Use of Spectral Analysis of Surface Waves (SASW) and Impact Echo (IE)
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values. These material modulus values are higher than modulus values computed from current dynamic modulus tests.
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Figure C1.3. SASW data analysis screen.
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disrupted and both higher resonant impact echo and lower flexural frequency modes of vibration will occur. This change in frequency will lead to variation in calculated thickness values at delamination locations.
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2 Equipment Specifications Currently, most commercially available portable devices for conducting SASW and IE testing on pavements are point-test devices, and some of them can conduct both SASW and IE simultaneously. To improve the testing efficiency, prototype testing equipment with rolling wheels has been developed.
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Table C1.1. Equipment Specification for Continuous SASW and IE Testing System Component SASW Specification IE Specification System typea Array of multiple sets of impact sources and pairs of sensors.
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3 Proposed Data Output and Display Requirements The field operation and playback software for SASW should be capable of the following displays: • Direct sensor time-amplitude waveform; and • Surface wave velocity–wavelength dispersion curve. Examples of this display are shown in Figure C1.1, Figure C1.2, and Figure C1.3.
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to one mile, but may be shorter for smaller manual systems)
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The testing mode selected depends on the desired level of pavement condition detail. The permitted speed of data acquisition (travel speed of the equipment during testing)
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7 Test Output Data Formats The goal of field data collection is to produce a three-dimensional volume of measurements. The x distance is defined as the longitudinal direction of vehicle travel in the lane.
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• Correlating the field notes with the data files to ensure that all noted files actually exist; • Checking all of the recorded data files to confirm that their size is consistent with the amount of data collected; • Scrolling through each data file to ensure that the data looks reasonable and that there are no problems with the data: and • Checking the recorded pavement length of each file (recorded distance) and confirming that it agrees with the intended length.
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The analysis of IE data is more direct. Each set of IE data measured in the field is a single receiver sensor waveform tied to a single x-y pavement coordinate location.
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Figure C1.5. Depth slices of the SASW measured surface wave velocity at incremental pavement depths.
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Figure C1.6. Example of impact echo pavement-thickness plot.
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APPENDIX C2 SASW/IE Vendor Features C17
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Olson Engineering, Inc./ Pavement and Bridge Deck Scanner (PBDS) SASW-IE (prepared by Olson Engineering)
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2. PBDS Software a.
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Figure C2.2. PBDS system attached to a scanning cart on asphalt overlaid bridge deck -- single pair of wheels at 6 inches apart for combined impact echo/surface waves scanning.
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Figure C2.3. A screenshot of the processed/analyzed data.
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distance wheel will be the most accurate measurement of distance. If desired, a video camera could also be incorporated into the PBDS system to provide operators with surface images of each scan.
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