How to Perform Pile Integrity Test?

Pile integrity test (PIT), or as ASTM D5882 refers to it as "low strain impact integrity testing of deep foundation is a widely used nondestructive test method for the evaluation of pile quality, integrity and to help estimate the unknown length of existing piles and foundations. Pile integrity test can be either used for for forensic evaluations on existing piles, or quality assurance in the new construction. The integrity test is applicable to driven concrete piles and cast-in-place piles.

What is Pile Integrity Test?

Pile integrity test (PIT), or as ASTM D5882 refers to it as "low strain impact integrity testing of deep foundation is a widely used nondestructive test method for the evaluation of pile quality, integrity and to help estimate the unknown length of existing piles and foundations. Pile integrity test can be either used for for forensic evaluations on existing piles, or quality assurance in the new construction. The integrity test is applicable to driven concrete piles and cast-in-place piles.

Step-By-Step Pile Integrity Testing with iPile

Pile Integrity Test (PIT) is normally performed by striking the pile head with a light hand-held hammer and recording the response of the pile using a motion transducer (i.e. accelerometer) coupled to the pile head. The hammer strike (blows) generate compressive stress wave that will travel through the pile. This wave is partly reflected from the pile toe or other anomalies within the pile in its way back to pile head. Any change in impedance (due to change in pile cross section, concrete density, or shaft-soil properties) within the pile can impact the reflecting signal.

Los Ensayos de Integridad de Pilotes

Los ensayos de integridad de pilotes suministran información sobre las dimensiones físicas, la continuidad o la consistencia de los materiales empleados en los pilotes. Los ensayos de integridad de pilotes constituyen una potente herramienta de trabajo que permiten determinar la existencia de defectos en los pilotes. i.Pile utiliza el método sónico, con martillo de mano, para el control de pilotes, sin que sea preciso ninguna preparación especial del pilote ni interferir con la marcha de la obra, dada la sencillez y rapidez del ensayo.

Applications and Limitations of Pile Integrity Test

Pile Integrity Test can be used to determine the integrity of piles. The method works best for long structural component such as driven concrete piles, cast-in place concrete piles, concrete filled steel pipe piles, timber piles, structural columns. The method works based on measuring and analyzing the velocity (required) and force (optional) response of pile. A hammer (regular or instrumented) is used to impact the pile surface and induce acoustic waves (WATCH: How PIT is Performed?). The test may not identify all imperfections, but generally can identify major defects within the effective length.