Thermal Integrity Profiling for Detecting Flaws in Drilled Shafts

Summary of research need Drilled shafts are being utilized more frequently for Wisconsin Department of Transportation (WisDOT) projects. To test the integrity of the shaft’s construction Cross-hole Sonic Logging (CSL) is commonly used. CSL testing is performed between tubes attached to the shaft’s reinforcing steel cage. CSL testing has limitations: (1) it can only measure integrity within the reinforcing cage and not the critical, exterior concrete which provides the soil structure interaction through skin friction and protection from corrosive environmental effects; and (2) it gives false anomalies (voids) in the shaft due to the de-bonding of the shaft concrete from the CSL tube. An alternative to CSL is Thermal Integrity Profiling (TIP) testing which offers several benefits: (1) it can be initiated immediately following concrete placement with results available within a day or two; (2) it can evaluate the presence of anomalies inside as well as outside the reinforcing cage; (3) it is not as susceptible to the false anomalies in CSL testing associated with de-bonding-TIP relies on thermal changes; (4) it has the ability to evaluate reinforcing cage alignment and the adequacy of the concrete cover outside the reinforcing cage, something other test methods cannot determine; and (5) it has been standardized by the implementation of American Society for Testing and Materials D7949 (ASTM D7949). The objectives of the study are to cConduct a detailed analysis of TIP testing and determine its viability as a means for quality control of drilled shaft construction. As part of the analysis: (1) TIP and CSL testing will be used, in accordance with ASTM D7949, on a test drilled shaft to detect the flaws constructed in the drilled shaft and identify the cause of each flaw. The effectiveness of TIP and CLS testing will be compared. (2) TIP test results from phase one and two of the WisDOT zoo interchange drilled shaft work will be analyzed. The results of this study will potentially demonstrate to WisDOT that TIP testing is a viable alternative to CSL. If TIP testing is determined to be practical, changes to WisDOT Standard Specifications will be made and WisDOT guidance documents will be developed that will allow for or mandate TIP testing for evaluating drilled shaft construction.


  • English


  • Status: Active
  • Contract Numbers:


  • Sponsor Organizations:

    Wisconsin Department of Transportation

    4802 Sheboygan Avenue
    Madison, WI  United States  53707
  • Project Managers:

    Zimmer, Andrew

  • Performing Organizations:

    University of Missouri, Columbia

    Department of Civil Engineering
    Columbia, MO  United States  65211
  • Principal Investigators:

    Boeckmann, Andrew

  • Start Date: 20161102
  • Expected Completion Date: 20181102
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01622254
  • Record Type: Research project
  • Source Agency: Wisconsin Department of Transportation
  • Contract Numbers: 0092-16-07
  • Files: RiP, STATEDOT
  • Created Date: Jan 9 2017 3:02PM