With evidence of cracking and rust, our client was concerned about corrosion and the danger of a failing concrete slab within their parkade. In order to identify the extent of the damage and determine repairs, Xradar were enlisted to map the area for corrosion.
Concrete corrosion is created when water and oxygen are able to get through concrete pores or voids, starting a chemical reaction of corrosion and degradation of the steel within the structure. It often goes undetected until it is too late. By mapping and identifying corrosion you can thoroughly assess your structure and prevent costly damages.
Involving an engineer, Xradar scanned the parkade slab and walls using Ground Penetrating Radar (GPR) and Xradar Enhanced Concrete Scanning to identify areas of corrosion.
Through computer assisted image analysis a map was produced detailing the areas of concern and core samples were taken to verify the results. A 3D Laser Scan of the parkade was also carried out, with information presented and overlaid on the images in the report.
Following the scan the results were used to estimate the quantities for repair and to observe potential future corrosion hot spots.
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Xradar used a high frequency GPR survey to achieve the required accuracy and a mid-range frequency GPR to reveal information about the structural details underpinning the area. Several grids with evenly spaced lines were laid out resulting an approximately 350 sqm of total coverage.
The Xradar systems used were carefully calibrated onsite to ensure accurate depth measurements. Data was processed and compiled to produce contoured heatmap style results. Results were presented in a CAD workspace and digital reports delivered.
The Xradar survey was complimented with Vuit 3D laser scanning to achieve accurate, scaled georeferencing of our survey grids, and a convenient way to view and present the asphalt thickness results.
The survey revealed a distinct change in the asphalt thickness due to the structural change to the subsurface that was confirmed with the survey results from the mid-range frequency GPR. The data uncovered not only the asphalt thickness but also the nature and location of the subsurface features such as: beams, voids and structural slab changes.