Nondestructive Testing to Identify Delaminations Between HMA Layers, Volume 3 - Controlled Evaluation Reports (2013) / Chapter Skim
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24 Controlled Evaluation of Mechanical Wave Technologies: Portable Seismic Pavement Analyzer, Scanning Impact Echo, and Multiple Impact Surface Waves This chapter was prepared by Ray Brown and Haley Bell of the U.S. Army Corps of Engineers Engineering Research and Development Center (ERDC)
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25 scaled as a probability measurement point being taken on a bonded slab. Since the conditions of the laboratory slabs were known, the area with the shallow delamination was used for calibration.
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26 Note: delam = delamination. Figure 4.2.
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27 Field Testing The conditions of Sections 1, 2, 3, 5, and 8 were known to the vendor during the February testing and for the data analysis presented here. Figures 4.4 and 4.5 show the time and frequency domains of four conditions [i.e., shallow delamination, deep HMA delamination over portland cement concrete (PCC)
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28 Note: AC = asphalt concrete. Figure 4.4.
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29 Note: AC = asphalt concrete. Figure 4.5.
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30 Oct.
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31 purpose of the October testing was to identify HMA delamination at warmer pavement temperatures. Round 2 testing was conducted in March 2010 where the conditions of the laboratory slabs and Sections 1, 2, 3, 5, and 8 on the test track were provided to the vendor after the analysis of Round 1 testing.
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32 The second analysis of the Round 1 test track data revealed that the SIR performed poorly in identifying delamination. The device showed potential but is not ready to be implemented for identifying delamination.
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33 Table 4.5. Round 1 MISW Results on Test Track Test Station (ft)
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34 Section 4 Figure 4.9. Scanning IE thickness plots for Sections 3 and 4.
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35 Figure 4.12. Scanning IE thickness plots for Sections 9 and 10.
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36 Table 4.7. Round 2 MISW Results on Test Track Test Station (ft)
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