Corrosion mapping · Trois-Rivières
Corrosion mapping in Trois-Rivières
Corrosion mapping locates the zones where reinforcing steel is likely corroding in a concrete slab or wall, so that repairs can be targeted in Trois-Rivières. Placing the areas to watch on a drawing, before settling how far a repair should go.
Trois-Rivières
Working in Trois-Rivières
A corrosion map covers a surface and places the recorded areas on a drawing. In Trois-Rivières, on an exposed deck or a balcony, it mainly serves to frame how far the repair will reach, and to separate an area to monitor from an area to treat. State the levels and sectors to cover, the repairs already carried out and the visible distress. A survey cross-checked with field observations is worth more than a map read on its own.
In Trois-Rivières, some light work does not require a building permit, yet a work declaration remains mandatory before starting. It is free of charge and can be filed by whoever carries out the work, with written authorization from the owner. Before coring or opening a slab, check which side your work falls on.
Preparing your project in Trois-Rivières
- List the levels and sectors to cover, and those left outside the scope
- Identify earlier repairs and distress that is already visible
- Specify the drawing format expected for placing the recorded areas
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
Reading a corrosion map
Read colours with the legend, method, measurement conditions and limitations. A probability class is not a percentage of steel section loss.
Potential measurements do not determine the structural properties of steel or reinforced concrete. Additional data may be needed to interpret activity and consequences.
Deliverables and repair planning
Agree on plans, coverage, presentation and the engineer’s requirements before the survey. Located findings support comparisons and additional investigation.
Repair quantities, specifications and cost estimates require appropriate diagnosis. Visible deterioration alone does not establish the repair scope.
When to request mapping
Describe observed conditions and the decision you need to make.
- Before parking garage repairs
- After observing rust stains or spalling
- When documenting changes in a structure
- Alongside structural assessment
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.
Does a corrosion map give the exact extent of the repairs?
It delimits recorded areas, which help frame an extent. The decision to repair rests with the engineer and the contractor, based on the map and on checks made on site.
Should the whole structure be covered, or only part of it?
That depends on the question asked and on the scope of the assignment. A partial perimeter is possible, provided the report states clearly what was covered and what was not.
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