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Buried Utilities Beneath a Reinforced Concrete Slab: Detection Through Dense Reinforcement

Buried Utilities Beneath a Reinforced Concrete Slab: Detection Through Dense Reinforcement

Description

A 4.50 m profile recorded with a GSSI UtilityScan DF dual-frequency 300/800 MHz antenna, on a reinforced concrete slab, perpendicular to the expected line of buried pipes. One file.

Detecting a utility through dense reinforcement is one of the least rewarding situations in the trade. The rebar mat acts as a screen: it reflects much of the energy, saturates the upper part of the radargram and lets little signal reach what lies beneath. Success is never guaranteed, and that has to be said before going on site.

Here, detection succeeds. The two frequencies divide the work sharply. The 800 MHz channel images the reinforcement precisely — the bars are crisp, regular, easy to pick — but barely penetrates beyond it. The 300 MHz channel resolves the steel poorly, and that is what saves it: its longer wavelength passes through the mat and brings out the utilities below.

This illustrates a principle that practice teaches better than theory: the higher frequency is not "better", it answers a different question. On this slab, the channel showing the most detail is the one that cannot see the target.

At least two utilities are known to run at this location, though their nature, diameter and exact depth are not documented.

Raw unprocessed files.

réseaux sous dalle, utilities beneath slab, détection à travers ferraillage, detection through reinforcement, ferraillage dense, dense reinforcement, écran d'armatures, rebar screening, nappe d'armatures, rebar mat, atténuation, attenuation, pénétration, penetration, longueur d'onde, wavelength, compromis résolution-pénétration, resolution-penetration trade-off, bi-fréquence, dual-frequency, 300 MHz, 800 MHz, UtilityScan DF, conduites enterrées, buried pipes, avant percement, before coring, dalle en béton armé, reinforced concrete slab, position théorique, expected line

Information

ApplicationUnderground Utilities, Concrete / Civil Eng.
GSSI antennaUtilityScan DF
Frequency300/800 MHz
FormatDZT
Size1 MB
Files1
Channels2
GPS filesNot available
ContributorMDSLab
Added on2026-09-28
Ground truth Partial known presence of at least two utilities at this location

Cite this dataset

APA

MDS - Le Matériel de Sondage - GPRbase (2026). Buried Utilities Beneath a Reinforced Concrete Slab: Detection Through Dense Reinforcement [Data set]. GPRbase. GSSI, UtilityScan DF, 300/800 MHz. https://www.gprbase.com/en/dataset/ds036-buried-utilities-beneath-a-reinforced-concrete-slab/

BibTeX

@misc{gprbase_ds036,
  author       = {MDS - Le Matériel de Sondage - GPRbase},
  title        = {Buried Utilities Beneath a Reinforced Concrete Slab: Detection Through Dense Reinforcement},
  year         = {2026},
  publisher    = {GPRbase},
  howpublished = {\url{https://www.gprbase.com/en/dataset/ds036-buried-utilities-beneath-a-reinforced-concrete-slab/}},
  note         = {GSSI, UtilityScan DF, 300/800 MHz. Licensed under CC BY-NC-SA 4.0},
}

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