Cross Hole Sonic Logging

Cross Hole Sonic Logging (CSL) is the most accurate and reliable technique for assessing the integrity of deep foundation elements constructed on-site from concrete or grout. The crosshole sonic logging method is normally applied as a quality assurance (QA) technique for newly placed drilled shafts and auger cast piles, but can also be applied to slurry walls, mat foundations, and mass concrete pours. CSL testing provides assurance that the foundation concrete is sound with no defects such as soil intrusions, necking, sand lenses, voids, etc. The extent, nature, depth, and approximate lateral location of a defect(s) can be determined with the CSL method. The CSL method is typically performed in access tubes (steel or PVC) of 1.5 inch I.D. or greater which are tied to the rebar cage and cast into the shaft at the time of construction. The test can also be performed using core holes (if available).

FTG’s lead Geophysical Engineer has performed Crosshole Sonic Logging since 1996. Mr. Jeff Goodwin, P.E. is a recognized expert in the field and has made numerous presentations on CSL testing and drilled shaft remediation for the ADSC, DFI & ASCE.

Foundation Test Group, Inc. has performed CSL testing and Sonic Echo Testing (PIT) in over 20 states for agencies including: US Army Corp of Engineers, Maryland Aviation Administration, Maryland DOT, Virginia DOT, PennDOT, New Jersey DOT, New York DOT, Indiana DOT, Kentucky DOT, Ohio DOT, West Virginia DOT, Arkansas DOT, Louisiana DOT, North Carolina DOT, New York DOT, Connecticut DOT, Oklahoma DOT, New Hampshire DOT Delaware River Authority, Pennsylvania Turnpike Authority, New Jersey Transit, New Jersey Turnpike, Texas DOT, and various commercial projects.

Thermal Integrity Profiling (TIP) is a new method for determining the integrity of a cast in place shaft, pile or anchor.  FTG is a leader in integrity testing and this new technology adds to our commitment to provide State of the Art testing and analysis methods.