Guide for Conducting Forensic Investigations of Highway Pavements (2013) / Chapter Skim
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Pages 29-38
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29 This chapter discusses the implementation of the investigation plan described in Chapter 4 as well as analysis of the non-destructive testing data, the preparation of an interim report, and the decision to continue or terminate the study based on the findings at this stage of the investigation. 5.1 Implementing the Initial Investigation Plan Conducting the NDT identified in the initial investigation plan should begin as soon as possible after the preinvestigation site visit.
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30 Distance Depth Time Figure 5.1. Example GPR radargram showing layer depth.
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in more detail for stripping. While conclusive evidence is unlikely, sufficient resolution should be available to select locations where cores can be taken or a DCP can be driven to validate the observation.
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32 – Link weak/problem areas to the issues being investigated (or confirm exceptional performance)
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33 surface temperature to determine if temperature is controlling the results. If it is, comparing the surface temperatures at the time of testing against surface temperatures across the year will help determine if the LTE results are representative of high or average temperatures.
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34 – The software should estimate the elastic modulus of the slab and the k-value of the combined underlying layers, as a minimum. Backcalculate as a two-layer system consisting of the concrete and the underlying layers.
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35 5.2.4 Skid Resistance/Friction Use the following procedure for analyzing skid resistance/ friction issues: • Compare the friction values for the investigated pavement sections to the friction index in use by the agency. Data plots of friction against distance are useful for identifying problem areas or areas of better-than-expected performance (Figure 5.6, for example, shows difference in friction values for two adjacent lanes)
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36 • If the comparison indicates underperformance or betterthan-expected performance, review the mix design and as-built records to determine whether aggregate selection (asphalt, surface treatment, and concrete) , surface texturing (concrete)
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37 clogged and should be checked for permeability in the wheelpath (see Section 5.2.7)
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38 5.3 Interim Report • Analysis and interpretation – Summarizes non-destructive testing (and limited coring) data interpretation in terms of answering the investigation questions.
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