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Tuesday, 27 March 2018 12:57

Pile Diameter Modeled Using Thermal Integrity Profiling Verified with Extracted Pile Measurements

Thermal Integrity Profiling is a non-destructive integrity test method used for evaluating the post-construction quality of cast-in-place foundations. This method uses the temperature measurements, or hydration energy, from the curing cement to assess integrity.

By definition, any type of drilled deep foundation is buried in the ground, hiding its constructed shape from visual inspection. This complicates the quality assurance process, leaving reasonable potential foundation performance questions. Fortunately, a very quick, reliable, and convenient means of indirect cast-in-situ pile visualization is available: The Thermal Integrity Profiler or TIP. Thermal Integrity Profiling is a non-destructive integrity test method used for evaluating the post-construction quality of cast-in-place foundations. This method uses the temperature measurements, or hydration energy, from the curing cement to assess integrity.

These measurements are obtained using embedded Thermal Wire® cables attached to the reinforcing cage for drilled shafts or to a center bar for smaller diameter auger castin-place (ACIP) piles. In general, reductions in temperature correlate to reductions in the effective radius or the presence of lower quality concrete/ grout. Increases in temperature correlate to increases in cover or areas of increased cross-section. TAP boxes automatically record the temperature every 15 minutes at each thermal sensor location (one foot or 300 mm depth increments). This process is typically complete within 10 to 48 hours after initial concrete/grout placement.

On a project in Los Angeles, California, GRL Engineers, Inc., contracted by Shoring Engineers, was given a rare opportunity to observe the entire ACIP pile after construction. Project specifications required both a static load test to determine the bearing capacity and shaft resistance distribution (using embedded strain gages), and TIP for pile integrity evaluation.

This is part of the latest Newsletter of Pile Dynamics and GRL read more here

Source: Pile Dynamics

Read 432 times Last modified on Tuesday, 27 March 2018 14:25

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