Scanning Core Locations with Xradar Concrete Scanning

Xradar were contacted at the referral of structural engineers to perform a concrete scan in multiple survey locations in Downtown Toronto.

Situation

A construction client needed to core 22 locations on site, however, due to the location of the site, the slab thickness and the size of the areas of interest, X-ray was not a viable option. An Xradar technician attended the site and soon identified additional issues.

An enormous amount of conduit was detected in the slab and high voltage cables were known to be in the vicinity, all leading to the main electrical room next door to the tenants space. Unfortunately the design team did not factor in that cores could not take place in some proposed areas because of the large amount of conduit.

Solution

Utilizing Xradar's enhanced concrete scanning. our trained technician was able to survey all 22 proposed core locations, highlighting recommended areas for each core. These areas were then cored without incident and not even a bar was nicked.

One of the core locations, with the recommended area highlighted.

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.

3D Laser Scan, with Xradar results overlaid
Asphalt Thickness Map