Low strain integrity test is one of the methods for assessing the condition of cast-in-place piles, drilled shafts or driven concrete/timber piles.
The test is based on wave propagation theory. ‘Low strain dynamic test’ stems from the fact that applying a light impact to a pile produces a low strain.
This procedure is performed with a hand-held hammer to generate an impact, an accelerometer or geophone placed on top of the pile to measure the response to the hammer impact, and data acquisition, along with subsequent interpretation of the electronic equipment.
PIT is standardised by ASTM D5882 Standard Test Method for Low Strain