Do you have a technical challenge? Get in touch with us
Do you have a technical challenge? Get in touch with us
One of the methods that allows engineers to look inside a pile without excavating or damaging it is Crosshole Sonic Logging (CSL)
CSL is based on the principle that ultrasonic waves travel through concrete in a predictable way — provided the material is uniform and properly executed.
In measurement tubes cast into the pile, engineers lower:
a transmitting probe,
a receiving probe.
An ultrasonic pulse is sent between them, and the system records:
For homogeneous, well-compacted concrete, these parameters remain stable and consistent along the entire pile length.
If defects such as:
voids,
segregation,
or so-called rock nests,
are present, the signal clearly indicates a problem:
- delayed arrival,
- reduced energy,
- changes in wave velocity.
These variations allow engineers to precisely identify potential defects.
A CSL report leaves no room for guesswork. It includes:
- velocity and energy profiles,
- waterfall plots,
- clearly defined evaluation criteria,
- an unambiguous classification of results.
This enables an objective assessment of pile quality — based on measured data, not assumptions.
CSL is particularly valuable during foundation acceptance because it:
- verifies concrete quality throughout the entire pile volume,
- supports fast, well-informed technical decisions,
- reduces the risk of costly remedial works at later stages,
- provides investors and contractors with solid, measurable evidence of quality.
Crosshole Sonic Logging is a clear answer to a key engineering question:
Has the pile been constructed correctly over its full length?
At DMT, CSL is an essential part of foundation quality control — a tool that helps us understand what lies beneath the surface.
Because good engineering starts with understanding what cannot be seen with the naked eye💡
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ABOUT THE COMPANY
Geotechnical investigation
We operate in Europe as:
DK
DMT Engineers A/S
DMT Engineers A/S
Skomagervej 13C
7100 Vejle
CVR-np. 12476779
DE
DMT Ingenieure GmbH
DMT Ingenieure GmbH
Zum Audorfer See 9
D-24782 Büdelsdorf
Registergericht: Amtsgericht Kiel HRB 12196 KI
Geschäftsführer: Lars Gøttrup Christensen
USt-IdNr.: DE134866110
Sitz der Gesellschaft: Zum Audorfer See 9, D-24782 Büdelsdorf
All rights reserved. DMT 2025.
