Cross Hole Sonic Loging
The aim of the testing is to conduct cross hole sonic logging tests on pile foundations as per ASTM 6760. Here one transmitter and one receiver is lowered in the pile shaft through access pipes and then pulled at a reasonably constant rate to continuously record the arrival time of pulses between the probes and also record the loss of energy during transmission, as the probes are drawn up from the bottom to the top of the pile. This is a quality assurance program to ensure that the pile shaft is formed properly and is of targeted depth. The purpose of this test is to check the structural integrity, extent & location of defects & quality of concrete, between pairs of PVC tubes / mild steel pipes pre-installed in cast- in-situ bored pile.