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Phone: 02 9453 9999 or Email: sales-operations@pcte.com.au
The CorroWatch acts as an early warning system to predict the initial stages of corrosion in concrete structures. It is cast into the cover concrete, normally in newly cast concrete structures. The sensor can measure most of the relevant corrosion parameters.
Overview | GX1 vs GX2 | SUE & Utilities | Structures & Pavements | Software & Outputs | Case Studies | Specifications | Support
Collect high-density, georeferenced GPR data across wide areas and view the subsurface in 3D as you scan. Choose the GX2 array for SUE and utility mapping, or the GX1 array for structural, bridge and pavement investigations.
Best suited to:
Best suited to:
Recommended array: GX2
Recommended array: GX1
Cover more ground
Collect multiple parallel profiles in one pass instead of uilding a grid line by line.
See results during acquisition
View georeferenced radargrams and time-slice information in the field rather than waiting until the data is returned to the office.
Produce repeatable mapped data
Combine wheel-positioned GPR data with GNSS, project coordinates and survey linework.
Use one platform for two very different applications
Exchange GX1 and GX2 arrays without purchasing two complete cart platforms.
The GX2 transforms the GS9000 into a high-density subsurface utility mapping system. Its 11-channel, low-frequency GPR array captures an 83 cm-wide swath in each pass, helping operators detect and map buried pipes, ducts, cables, voids and other subsurface features. Live georeferenced data lets SUE teams review coverage on site and produce accurate CAD, GIS and project-coordinate deliverables.
1. Plan the survey
Load satellite imagery, CAD information, project coordinates or survey control.
2. Collect dense multichannel data
Survey an approximately 0.82 m-wide swath with 11 channels in each pass.
3. Review data live
Examine radargrams, georeferenced time slices and marked features while still on site.
4. Interpret and digitise
Add points, linework, tags, photographs and field observations.
5. Process and deliver
Merge survey areas, apply processing and export mapped information for the customer’s CAD, GIS or reporting workflow.
The CorroWatch is a multi-sensor, which in the standard version consists of four black steel anodes and one noble metal cathode. The anodes are placed in varying, but defined distances from the exposed concrete surface. The height of the anodes is flexible and can be adjusted according to the concrete cover thickness.
The CorroWatch sensor is acting as a macrocell measuring the corrosion activity between the corroding (anodic) and not corroding (cathodic) on the metal surface.
By measuring the corrosion current and also electrochemical potential in different depths in the concrete cover it is possible to predict when the corrosion should reach the reinforcement and thus prepare the necessary maintenance measures in time before the damage occurs.
To predict when the reinforcement corrosion will start corroding different measurements techniques could be chosen. First and foremost it could be done by means of electrochemical potential measurements against a stable reference electrode. The current is measured, either with a volt-meter or a specially designed data logger (ie CorroZoa). When corrosion starts, the current will increase significantly.
The CorroWatch sensors allow use of both options for measurements of corrosion current. However the use of zero resistance Ammeter technique is to be preferred. In the beginning before corrosion occurs on the anode the measured corrosion current is very small. When the passive layer is broken and corrosion is initiated the measured corrosion current increase rapidly.
The CorroWatch multi-probe is composed of: 4 anodes, 1 cathode, 1 reinforcement connection and an internal temperature sensor. The 4 anodes are placed in a joint ring in varying but well known distance to the ring’s bottom. The cathode is placed in the ring’s periphery.
To obtain optimum evaluation possibilities, we recommend the CorroWatch probe to be mounted in combination with an ERE-20 reference-electrode.
The cables from the CorroWatch probe and the ERE-20 reference-electrode are joined and conducted to the concrete surface. To protect against casting damage, it might be advantageous to conduct the cables in conduits.
It is recommended to install the CorroWatch probe in the concrete cover between the concrete surface and the outer reinforcement layer. To ensure correct function it is extremely important that great care is taken when mounting the CorroWatch probe. It is important that the position of the probe does not change during casting. This is ensured in the best way by e.g. mounting the probe on at least two reinforcement bars..
The adjacent picture shows a CorroWatch multi-sensor which has been installed for monitoring of time to corrosion initiation in the immersed elements of Øresund tunnel connecting Denmark and Sweden.
In each of the chosen tunnel elements 21 CorroWatch were installed together with 27 ERE 20 reference electrodes. In total 189 CorroWatch were installed in 9 tunnel elements. The CorroWatch were installed in such a way that the concrete cover on the highest electrode (anode) is approximately 25 mm from the concrete surface.
In figure 5 an example from a laboratory test is shown indicating when the corrosion initiates at each of the 4 anodes.
Book a SUE Workflow Demonstration
The GX1 transforms the GS9000 into a high-resolution structural assessment system for concrete slabs, bridge decks and pavements. Its dense, dual-polarisation array captures detailed 3D data across wide areas, supporting reinforcement and cover mapping, moisture and deterioration assessment, and analysis of asphalt and pavement layers. Live visualisation helps confirm survey coverage on site, while post-processing tools produce clear, report-ready condition maps.
1. Define the inspection area
Import the structure, bridge, pavement or survey background.
2. Collect closely spaced profiles
Capture 35 longitudinal and 15 cross-polarised channels with dense spacing.
3. Review coverage in the field
Use live radargrams and time slices to confirm that the required area has been captured.
4. Process the dataset
Apply velocity, gain, background removal, migration, filtering and topographic correction as appropriate.
5. Generate diagnostic maps
Create depth slices, reinforcement maps, layer information or application-specific condition maps.
6. Integrate with the engineering assessment
Export figures, mapped anomalies and raw data for inclusion in the engineer’s final interpretation and report.
Field information
Processed Diagnostic Information
Engineering deliverables
Book a Structural Assessment Demonstration
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