Cross Hole Sonic Logging (CSL)

Yes, Pulse Echo Testing (PIT) can be used to verify anomalies detected by Crosshole Sonic Logging (CSL) testing. While CSL provides a detailed assessment of the integrity of drilled shafts and other deep foundations by evaluating the sound wave travel times between pairs of access tubes, PIT offers a complementary method by sending a stress wave down the length of the shaft and analyzing the reflected signals. This can help confirm the presence, location, and extent of anomalies such as voids, inclusions, or cracks identified during CSL testing, providing a more comprehensive evaluation of the foundation’s condition. It is important to note, however, that anomalies at the pile toe are difficult to detect using PIT as they can be masked by the toe reflection.

Thermal Integrity Profiling (TIP) and Cross-Hole Sonic Logging (CSL) are both methods used to evaluate the integrity of deep foundations, but they operate differently:

• TIP: Uses the heat generated by curing concrete to detect anomalies. Sensors measure temperature variations along the pile, identifying potential defects like voids or inclusions based on deviations from expected temperature profiles. This test also allows to assess the concrete cover by detecting deviations of the reinforcing cage.
• CSL: Involves passing ultrasonic pulses between pairs of access tubes installed in the pile. By analyzing the travel time and signal strength of these pulses, CSL can detect anomalies within the pile core defined by the positioning of the access pipes within the cage. This test does not report on concrete outside the core.