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Bernard H. Hertlein, FACI
Low-strain integrity testing was developed to verify the integrity and quality of deep foundation elements such as driven piles, drilled shafts and Augered, Cast-in-Place (ACIP) piles. There are five commercially-available test methods currently in use: Sonic Echo Pile Integrity Test (PIT), Impulse Response Spectrum (IRS), Crosshole Sonic Logging (CSL), Gamma Density Logging (GDL), and Thermal Integrity Profiling (TIP). Each method has specific capabilities and limitations that must be considered when planning a testing program. If the selected test method is inappropriate for the foundation type of site conditions, the test results will at best be inconclusive, and at worst, may be actively misleading. Construction methods and allied site activities also have a direct bearing on the application of the test methods and can adversely affect the quality of the test data and the reliability of the data analysis and interpretation.
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