Integrity (ASTM 5882)

Grout Systems works with GRL Engineers. Inc., to provide integrity testing based on ASTM D588, the standard test method for low strain impact integrity testing of deep foundations.

Low-Strain Impact Integrity Testing is a non-destructive pile testing method for integrity assessments of augered cast-in-place piles, drilled shafts or driven concrete or timber piles. If major defects exist, test results may be interpreted to estimate their magnitude and location. Test results may also be used to estimate pile length.

The Low-Strain Test, also known as Pile Integrity Test (PIT), encompasses the Pulse Echo Method and the Transient Response Method. Tests by either method are normally performed after foundation installation and curing, and require minimal pile preparation. Because of their simplicity, speed of execution and relatively low cost, these integrity tests may be performed on 100% of the piles on a given a job site.

In the test, the top of the pile is hit with a hand held hammer. The impact of the hammer generates a compressive stress wave in the pile or shaft, and an accelerometer placed on top monitors the motion associated with this wave. The stress wave propagates down the pile shaft, and is reflected when it encounters either the toe or a non-uniformity of the shaft. These reflections cause a change in the acceleration signal measured on the pile top, which is picked up and processed by the Pile Integrity Tester (PIT) equipment and interpreted by an experienced engineer.

(Credits: GRL Engineers)

Interested in integrity testing, contact the experienced team at Grout Systems.