Cross Hole Sonic Logging Test which is used to assess the integrity of concrete within deep foundation elements such as drilled shafts, caissons, barrettes, and diaphragm walls. This test is conducted in accordance with the ASTM D-6760 standard.

The test involves sending ultrasonic pulses from a signal transmitter to a signal receiver within the foundation element. When the ultrasonic waves travel through concrete with consistent properties, the travel time remains constant throughout the length of the element. However, when there is a change in the concrete properties within a certain section, the travel time of the ultrasonic waves will change due to the variation in the wave's speed. This change in travel time indicates an anomaly in the concrete.

The Cross Hole Sonic Logging Test is a popular and convenient method for assessing the quality and integrity of deep foundation elements because it is quick and can be conducted throughout the entire length of the element. It is an essential tool for quality control and ensuring the structural integrity of such foundation elements.