Corrosion mapping · Gatineau
Corrosion mapping in Gatineau
Corrosion mapping locates the zones where reinforcing steel is likely corroding in a concrete slab or wall, so that repairs can be targeted in Gatineau. Mapping in an occupied building includes parking access and zone coordination from the outset.
Gatineau
Working in Gatineau
In an occupied building in Gatineau, parking access and zone coordination must be built into the mapping request. Describe the levels involved and the sectors for which earlier observations are available. Existing reports make it easier to spot changes, provided the methods used are taken into account. Specify the preferred language and format. The work schedule and any timing constraints must be agreed according to the assignment.
In an occupied building, coordination weighs more than technique on how long the assignment takes. Freeing spaces, notifying occupants, putting up signage and restoring circulation take real time in the day, and that is planned in the request rather than on site.
The phasing chosen has to stay compatible with the final map. Breaking the survey up as availability allows produces portions that join badly; deciding the order of sectors in advance lets the map read as one piece, even when it was made in several visits.
In Gatineau, work on an existing building costing less than $26,000 before taxes generally does not require a permit. The City does, however, require a building permit for work involving the foundation, structure or interior walls of a building, among others.
Preparing your project in Gatineau
- Describe the parking levels involved
- Attach existing reports with their methods
- Agree on schedule and timing constraints for the assignment
How Gatineau’s building stock shapes your concrete surveys
Downtown Gatineau, in the Hull sector, still bears the mark of the Great Fire of April 26, 1900. According to the Répertoire du patrimoine culturel du Québec, the fire destroyed half of Hull and part of Ottawa, some 1,300 buildings, after which the City of Hull strictly enforced the by-law banning wooden buildings on major streets. Between 1880 and 1933, Hull went through eight major fires. The Kent-Aubry-Wright heritage site therefore gathers mostly buildings from the rebuilding, in red brick and wood, including many “matchbox houses” with a front-facing gable.
Industry shaped this landscape. The E.-B.-Eddy buildings, erected in stone from 1883 onward after a fire in 1882, recall a company that moved from matches to paper, and the Répertoire links the post-1900 rebuilding to growth driven by electricity generation and pulp and paper.
Another era is layered on top. According to Public Services and Procurement Canada, the Place du Portage complex groups federal buildings built between the 1970s and the early 1980s, covering 447,000 m² over five phases and occupied by more than 10,000 employees. Portage III, built between 1973 and 1978, includes office towers, retail areas in the basements and an underground parking garage. It is undergoing a mid-life renewal because its base building systems have reached the end of their useful life.
Underground parking garages beneath office towers, such as the one included in Portage III, are the first places to look. If slabs receive meltwater carrying de-icing salts in winter, locate the ramps, driving aisles and drains, and indicate any membranes or repairs already in place.
When a renewal is carried out in phases, a map produced before finishes are replaced establishes a baseline. Set the zone layout from the outset so the measurement can be repeated on the same sectors after the work.
Measuring corrosion activity
The ASTM C876 test method covers the estimation of the corrosion potential of uncoated reinforcing steel in concrete, for the purpose of determining its corrosion activity. Taken on a grid, these measurements produce a map of the surveyed surface.
Exposed slabs and parking garages
Parking garages are subject to specific obligations in Quebec: an annual visual verification and an in-depth verification report by an engineer every five years, according to the Régie du bâtiment du Québec. A corrosion map helps locate the zones to watch between these verifications.
- On a cracked or spalled parking slab
- Before planning concrete repairs
- To monitor an area that has already been repaired
Mapping method, process and limitations
How potential measurements work, how the survey runs, how to read the maps and their limitations are covered on our corrosion mapping in Quebec page. This page only covers what is specific to Gatineau.
Frequently asked questions
Does corrosion mapping indicate the strength of the structure?
Not directly. It provides information on the corrosion activity of the rebar; assessing structural capacity is an engineer’s responsibility.
Why combine it with a concrete scan?
Ground-penetrating radar locates the rebar and estimates its depth, which helps position corrosion measurements on the steel.
How should reporting requirements be specified?
State the desired language, formats, reference plans and intended recipients. Confirm these requirements before the visit.
Can work proceed level by level in an occupied parking garage?
Phasing by level can be considered depending on access and occupancy. It is agreed with the manager and included in the assignment schedule.
Sources
- ASTM C876-22b, Standard Test Method for Corrosion Potentials of Uncoated Reinforcing Steel in Concrete
- Régie du bâtiment du Québec: Parking garages, maintenance and inspection
- Ville de Gatineau: Ai-je besoin d’un permis de construire ou d’un certificat d’autorisation? (in French)
- Répertoire du patrimoine culturel du Québec: Site patrimonial du Portage (in French)
- Répertoire du patrimoine culturel du Québec: Grand Feu de Hull (in French)
- Répertoire du patrimoine culturel du Québec: Site patrimonial Kent-Aubry-Wright (in French)
- Répertoire du patrimoine culturel du Québec: Édifices E.-B.-Eddy (in French)
- Public Services and Procurement Canada: Renovation, repair and maintenance work at Place du Portage complex
- Public Services and Procurement Canada: Renewal of Portage III
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