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Infrared Thermal Integrity Testing: Quality Assurance Test Method to Detect Drilled Shaft Defects

Description: Thermal integrity profiling uses the measured temperature generated in curing concrete to assess the quality of cast-in-place concrete foundations (i.e. drilled shafts or ACIP piles) which can include effective shaft size (diameter and length), anomaly detection inside and outside the reinforcement cage, cage alignment, and proper hydration of the concrete. The ability to detect concrete volumes outside the reinforcing cage is perhaps its strongest feature. For this study, no anomalies within the reinforcing cage were encountered, but various forms of external section changes were identified, as well as several cases of off-center cages. Cage alignments generally varied with depth. Notably, only two cases of reduced concrete cover were detected; bulges were most common.

  • Date Published: June, 2011
  • Publication Number: WA-RD 770.1
  • Last Modified: July 11, 2011
  • Authors: Gray Mullins, Danny Winters.
  • Originator: University of South Florida. Civil & Environmental Engineering
  • # of Pages: 176 p., 13.17 mb (PDF)
  • Subject: Quality assurance, Temperature measurement, Infrared detectors, Cast in place concrete, Concrete curing, Shaft sinking, Piles (Supports), Tests for suitability, service and quality, Flaw detection.
  • Keywords: Thermal integrity testing, drilled shafts, anomaly, conductivity, detection.
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This abstract was last modified January 22, 2013