Guide for Conducting Forensic Investigations of Highway Pavements (2013) / Chapter Skim
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Pages 72-82
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72 The following eight case studies are examples of forensic investigations conducted for different purposes. Case studies 4 through 8 were investigated during the trial implementation of this guide.
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73 B.1.5.2 Test Pit The asphalt layer showed remarkably little oxidation and brittleness (Figure B.1c)
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74 B.2b) suggesting no problems with the asphalt concrete.
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75 ing under soaked conditions and that the active filler content may have been too low. B.3.3 Investigation Plan An initial investigation plan called for a visual assessment and FWD testing along the project to identify problems areas requiring additional investigation.
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76 possible distress in the future. Locations for coring and test pits were identified to assess the condition of the recycled layer.
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77 investigation because of an interest in making mix adjustments prior to the next paving season. B.5.2 Preliminary Investigation The paving project was completed in the summer of 2009 using an asphalt concrete (PG70-22ER binder)
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78 considered in formulating the plan, as mix properties and construction practices were believed to be the cause of the rutting. B.5.4 Destructive and Laboratory Testing Results from the laboratory tests performed on eight backup samples from the PG70-22ER mix showed that key mix properties (asphalt content, air voids, VFA and VMA)
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79 B.7.2 Preliminary Investigation The preliminary investigation compared available data relevant to performance of the PCC sections after subjectively sorting the sections by how they performed. The sections were grouped by age at time of reconstruction, cracking level, and design life comparisons.
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80 investigation was FWD testing prior to the development of mid-panel cracking to check for voids at the joints. However, such testing was no longer possible.
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81 Alligator cracking Rutting in the problem area View of distressed area Patched pothole 6; 0.91 4; 0.51 2; 0.59 0; 0.65 Distance from pavement edge (white strip line) and HMA thickness, in ft (Photos courtesy of California Department of Transportation)
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82 B.8.3 Investigation Plan An investigation plan was developed based on the initial field visit. The plan called for deflection testing using a Falling Weight Deflectometer (FWD)
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