News

DFI Publishes New White Paper on Crosshole Sonic Logging (CSL): Available for Free 

October 25, 2019, Hawthorne N.J.:

DFI announces the release of a new white paper titled “Terminology and Evaluation Criteria of Crosshole Sonic Logging (CSL) as applied to Deep Foundations.”

The paper was produced by a CSL Task Force comprised of members of the DFI Codes and Standards Committee, Drilled Shaft Committee and Testing and Evaluation Committee. The CSL Task Force was chaired by E. Anna Sellountou, Ph.D., P.E., Pile Dynamics.

The white paper reviews the state of the practice (including experience gained over the past 20 years), proposes improved CSL rating criteria and makes recommendations for additional assessment, as well as educate the industry on the proper interpretation of CSL testing.

Nondestructive testing of drilled shaft foundations via Crosshole Sonic Logging (CSL) is often performed as part of the quality assurance process to assess the soundness of concrete. The intent of CSL testing is to identify irregularities such as soil intrusion, necking, soft bottom, segregation, voids and other defects that could result in poor structural performance of the foundation. Over time, CSL rating criteria based on first arrival time and relative energy have incorrectly evolved to often be the sole means of determining the acceptability of a shaft. Some of these criteria have found their way into regulatory agency specifications, with acceptance values often differing from agency to agency. The 17-page paper is available at no cost at http://www.dfi.org/publications.asp?goto=1058#P1058.

About Deep Foundations Institute (DFI)
DFI (www.dfi.org) is an international association of contractors, engineers, manufacturers, suppliers, academics and owners in the deep foundations industry. Our multidisciplinary membership creates a consensus voice and a common vision for continual improvement in the planning, design and construction of deep foundations and excavations. We bring together members for networking, education, communication and collaboration. With our members, we promote the advancement of the deep foundations industry through technical committees, educational programs and conferences, publications, research, government relations and outreach. DFI has more than 3,500 members worldwide.
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