Various testing methods are available to determine the integrity of drilled shafts, which are Crosshole Sonic Logging, Gamma-Gamma testing, and Thermal Integrity Profiling (TIP). TIP is the preferred testing method, as it is done during the curing of the concrete and does not delay construction. Bridge Division has developed a Special Specification for TIP testing titled “Thermal Integrity Profiler (TIP) Testing of Drilled Shafts.”

TIP testing should be considered for use under the following conditions:

Mono-shafts;
Large diameter shafts (60” diameter, or greater);
Drilled shafts with a diameter > 24 inches encountering water bearing sands in the soil profile and on critical roadways, such as interstate systems, high ADT roadways, emergency routes, evacuation routes, etc.

Consult with the Geotechnical Branch to determine if a specific project might be considered a candidate for TIP testing.