Are there known Thermal Integrity Profiler (TIP™) testing results that show voids in the shaft? If so, how well are the voids represented?
Yes, there are TIP™ results that clearly show voids in the shaft. In his paper, written for the DFI Journal, Prof. Gray Mullins from the University of South Florida described a test on a drilled shaft with intentionally built defects. Please click on the following link to access the paper:
In the paper, the case history and caption for Figure 9 are of special interest. The defects shown in Figure 9 are clear and logical because no heat was present in the defect. The normal hot temperature signature of the shaft was interrupted by the “cold defect,” which is indicative of a void or weak concrete quality. In other words, defects are shown as local cool spots.
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