How to do Pile Integrity Test?
The PIT performs wave equation-based non-destructive foundation investigations known as Low Strain Impact Integrity Tests or Low Strain Dynamic Tests. These test may be performed by the Pulse (or Sonic) Echo or Transient Response Methods.
The PIT test consists of attaching one or two accelerometers to the foundation and using a hand-held hammer to impact it. The PIT collects the acceleration data and displays curves that reveal any significant changes in cross section that may exist along the shaft.
The pile head surface should be accessible, above water, and clean of loose concrete, soil or other foreign materials resulting from construction. Any type of contamination should be removed (using a grinder) to reach to solid and sound concrete surface. This step is so vital, because then connection between the sensor and concrete should be solid (firm contact). The location of the sensor should be selected away from the edges of the pile. The integrity testing should be performed no sooner than 7 days after casting or after concrete strength achieves at least 3/4 of its design strength, whichever occurs earlier.
A hammer (with or without force measurement unit) is used for impacting pile top; the impact should be applied axially with the pile. Motion transducer should be capable of detecting and recording the reflected echos over the pile top. Acceleration, velocity, or displacement transducers can be used for this purpose. At the minimum, acceleration transducer should have an Analog to Digital Converter with 12 bit resolution; and a Sample Frequency of at least 25 KHz.
The Pile Integrity Tester is available in several configurations to match the needs of each user. Find out which model is right for you here:https://www.cqtopgeo.com/pile-tester/pile-integrity-tester/low-strain-pile-integrity-tester.html