Concrete scanning · Sherbrooke
Concrete scanning and GPR in Sherbrooke
In Sherbrooke, concrete scanning with ground-penetrating radar (GPR) locates rebar, conduits and other embedded items before you core, drill or cut a slab, wall or column. Scanning often involves an altered building whose changes are not all documented.
Sherbrooke
Working in Sherbrooke
In Sherbrooke, a project in an altered building may involve slabs and walls whose modifications are not fully documented. Indicate known strengthening, estimated thicknesses and existing openings. A thick or heterogeneous slab may require specific scoping to define what the survey can document. If the project combines drilling and a question about the condition of the structure, present both objectives in the request to organize the investigations.
In Sherbrooke, the City provides a “Dois-je demander un permis ou non?” page to check whether construction or renovation work requires a permit or certificate. Check it before coring or opening a load-bearing wall.
Preparing your project in Sherbrooke
- Indicate known strengthening and existing openings
- Present drilling and any question on structural condition together
- Check the City’s “Dois-je demander un permis ou non?” page before opening a load-bearing wall
From the Magog River mills to today’s plants, Sherbrooke’s building stock
Sherbrooke industrialized along the Magog River, which runs through its downtown. The Répertoire du patrimoine culturel du Québec recalls that Andrew Paton opened a woollen mill there in 1866. The complex has five buildings of two to four storeys, erected between 1866 and 1938, in red brick on a stone foundation; the original mill followed the model of New England mills, with high ceilings and massive wooden beams. After the 1977 closure, some buildings were converted from 1983 onward into condominiums, low-rent housing, offices and restaurants. Nearby, the Frontenac power station, built in 1888, harnesses the river in its gorge.
The Musée d’histoire de Sherbrooke links the city’s architectural reputation to the houses of the Vieux-Nord, its institutional buildings and the commercial facades of Wellington Street. Between 2017 and 2020, the City assessed 7,000 buildings in its urban area, and nearly 200 were classified as having high heritage value.
Today’s industrial fabric is of a different kind. According to Sherbrooke Innovante, the city has 360 manufacturing companies employing more than 10,500 people, with key sectors in metal products, plastic and rubber products, equipment manufacturers, furniture and wood products, and transportation equipment. Training is provided by institutions including the Université de Sherbrooke, Bishop’s University and the Cégep de Sherbrooke.
In a former mill converted into housing or offices, the concrete may have come after the structure: a topping on a wooden floor, a basement slab, a stair or elevator shaft added during the conversion. Before drilling, ask whether the element dates from the original construction or from the conversion, and request the conversion drawings if they exist.
In a metal products or transportation equipment plant, a new production line may call for anchors, trenches or pits in an existing slab. Locate the reinforcement and embedded conduits over the full footprint of the future equipment, not only at the planned anchor points.
How ground-penetrating radar works
Ground-penetrating radar (GPR) emits high-frequency electromagnetic waves and records their reflections at boundaries between materials with different properties, such as concrete and steel. The ASTM D6432 guide describes this investigation method.
GPR is also one of the non-destructive test methods for in-place concrete reviewed by the American Concrete Institute (report ACI 228.2R-13).
Method, preparation and GPR limitations
When to request a scan, how to prepare the survey, how to use the findings and what ground-penetrating radar cannot see are all covered on our concrete scanning in Quebec page. This page only covers what is specific to Sherbrooke.
Frequently asked questions
Does concrete scanning damage the structure?
No. GPR is a non-destructive test method: the device moves over the concrete surface without drilling or coring it.
What can ground-penetrating radar detect?
Usually rebar, conduits and other embedded items whose electromagnetic properties differ from those of concrete. Readability depends in particular on depth and on the condition of the concrete.
Can several investigation needs be considered together?
Describe scanning, assessment and corrosion objectives together. Feasibility, methods and scheduling depend on the assignment.
Can a thick slab be scanned?
Readable depth depends on the antenna, moisture and reinforcement density. For a thick or heterogeneous slab, feasibility is clarified during scoping.
Sources
- ASTM D6432-19, Standard Guide for Using the Surface Ground Penetrating Radar Method for Subsurface Investigation
- American Concrete Institute, ACI 228.2R-13, Report on Nondestructive Test Methods for Evaluation of Concrete in Structures
- Ville de Sherbrooke: Dois-je demander un permis ou non? (in French)
- Répertoire du patrimoine culturel du Québec: Usine Paton Manufacturing Company (in French)
- Répertoire du patrimoine culturel du Québec: Centrale Frontenac (in French)
- Musée d’histoire de Sherbrooke: Notre riche patrimoine immobilier (in French)
- Sherbrooke Innovante: Manufacturier innovant (in French)
- City of Sherbrooke: Winter maintenance
Contact
Your project starts here.
Tell us about your needs. Our team supports you with rigour and precision, wherever you are in Quebec.