The primary shock wave which travels down the length of the pile is reflected from the toe by change in density between the concrete and the subsoil. The reflected echos are then recorded for each individual impact. Several impacts are applied to the top of the pile. The distance between the impact location and the sensor should be no larger than 300 mm. Acceleration, velocity, or displacement transducers can be used for this purpose. Motion transducer should be capable of detecting and recording the reflected echos over the pile top. The integrity testing should be performed no sooner than 7 days after casting of concrete.Ī hammer is used for impacting pile top. The location of the sensor should be away from the edges of the pile. This step is so vital, because the sensor and concrete should in firm contact. Any type of contamination should be removed (using a grinder) to reach sound concrete surface. The pile head surface should be accessible, above water, and clean of loose concrete, soil or other foreign materials. Equipment for pile integrity test How to perform pile integrity test? This evaluation practice is approximate and provides a rapid and simple way for evaluation of a large number of piles in a single working day. The test results can be used for evaluation of the pile cross-sectional area and length, the pile integrity and continuity, as well as consistency of the pile material. The method works best on solid concrete sections, and has limited application to unfilled steel pipe piles and H piles. Low strain impact integrity testing provides acceleration or velocity and force (optional) data on slender structural elements (structural columns, driven concrete piles, cast in place concrete piles, concrete filled steel pipe piles, timber piles, etc.). Pile integrity test can be used for forensic evaluations on existing piles or quality assurance in the new construction. Pile integrity test (PIT), or as ASTM D5882 refers to it as low strain impact integrity test, is a common non-destructive test method for the evaluation of pile integrity and/or pile length. Pile integrity test covers the procedure for determining the integrity of individual vertical or inclined piles by measuring and analyzing the velocity (required) and force (optional) response of the pile induced by an (hand held hammer or other similar type) impact device usually applied axially and perpendicularly to the pile head surface. Pile integrity test What is pile integrity test?
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