Pile Integrity Testing
Pile Integrity Testing (PIT) is a non-destructive way of evaluating pile integrity and/or length and can be used for forensic evaluations on existing piles or quality assurance in new construction. We recommend performing the integrity test no sooner than 7 days after casting or after concrete strength achieves at least 3/4 of its design strength, whichever occurs earlier.
Applicable to driven concrete piles and cast-in-place piles, the integrity test can be carried out where the pile head surface is accessible, above water and clean of loose concrete, soil or other foreign materials, allowing the connection between the sensor and concrete to be solid.
A hammer, with or without force measurement unit, is used to impact the pile top and axially with the pile. A motion transducer can detect and record the reflected echoes of each impact or the average can also be calculated and used. When an acceleration transducer is used, the apparatus provides signal conditioning and integrate acceleration to obtain velocity and balances the velocity signal to zero between impact events.