The Cross-Hole Sonic Logging Technique

The test determines the quality of concrete between pairs of tubes pre-installed in bored piles cast-in-situ concrete pile, or other types of concrete foundations using the Cross-Hole Analyzer. The measures the time it takes for an ultrasonic pulse to travel from a signal source in one access tube to a receiver in another access tube. In uniform, good quality concrete, the travel time between equidistant tubes will be relatively constant.Longer travel times indicates the presence of irregularities such as poor quality concrete, voids, honeycombs and soil intrusions.