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GPR Survey of a Car Park Raft Slab Showing Multiple Defects and Forms of Distress

GPR Survey of a Car Park Raft Slab Showing Multiple Defects and Forms of Distress

Description

Profile recorded on the raft slab of a car park showing multiple forms of distress, with a GSSI NX15 antenna at 1.5 GHz. One file.

Two phenomena dominate the radargram. Cover varies considerably along the profile: the bars do not follow a constant depth, which is itself diagnostic information — insufficient cover exposes the steel to corrosion, and this variability guides the rest of the investigation. The signal attenuates rapidly with depth, water saturation in the concrete dissipating the energy before it reaches the soffit.

The direct consequence: the raft thickness cannot be confirmed from this measurement. No usable back-wall reflection appears. That is a result, not a failure: an operator must recognise when a measurement does not answer the question asked, and say so rather than force an interpretation. Another non-destructive method — impact echo, ultrasonics, or a targeted core — would be appropriate here to obtain the thickness.

The signal-to-noise ratio nevertheless remains high in the upper part. The two closely spaced reinforcement layers are clearly distinguishable: the dataset suits practice in picking closely spaced layers, and shows what the resolution of the NX15 can separate.

Raw unprocessed files.

radier, raft slab, parking, car park, pathologies, distress, désordres, variation d'enrobage, cover variation, enrobage insuffisant, insufficient cover, corrosion des armatures, rebar corrosion, saturation en eau, water saturation, béton humide, wet concrete, atténuation du signal, signal attenuation, perte de signal, signal loss, rapport signal sur bruit, signal-to-noise ratio, épaisseur non confirmée, thickness not confirmed, limites de la méthode, method limitations, impact-écho, impact echo, ultrasons, ultrasonics, nappes rapprochées, closely spaced layers, deux nappes, two rebar layers, pointé d'armatures, rebar picking, résolution, resolution, NX15, 1500 MHz

Information

ApplicationConcrete / Civil Eng., Geotechnics
GSSI antennaNX15
Frequency1500 MHz
FormatDZT
Size9,9 MB
Files1
Channels1
GPS filesNot available
ContributorMDSLab
Added on2026-09-28
Ground truth Not verified

Cite this dataset

APA

MDS - Le Matériel de Sondage - GPRbase (2026). GPR Survey of a Car Park Raft Slab Showing Multiple Defects and Forms of Distress [Data set]. GPRbase. GSSI, NX15, 1500 MHz. https://www.gprbase.com/en/dataset/ds037-gpr-survey-of-a-car-park-raft-slab-showing-multiple-defects/

BibTeX

@misc{gprbase_ds037,
  author       = {MDS - Le Matériel de Sondage - GPRbase},
  title        = {GPR Survey of a Car Park Raft Slab Showing Multiple Defects and Forms of Distress},
  year         = {2026},
  publisher    = {GPRbase},
  howpublished = {\url{https://www.gprbase.com/en/dataset/ds037-gpr-survey-of-a-car-park-raft-slab-showing-multiple-defects/}},
  note         = {GSSI, NX15, 1500 MHz. Licensed under CC BY-NC-SA 4.0},
}

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