Corrosion mapping · Drummondville
Corrosion mapping in Drummondville
Corrosion mapping locates the zones where reinforcing steel is likely corroding in a concrete slab or wall, so that repairs can be targeted in Drummondville. A map is planned around how the premises are used, not around a drawing alone.
Drummondville
Working in Drummondville
Covering a large surface means clearing it in portions, which implies phasing agreed in advance. In Drummondville, if the project involves a planning meeting, that phasing is worked out at the same time. State how the premises are used, which portions can be cleared together and in what order. A survey broken up as availability allows gives a map that is harder to read than one from phasing decided at the outset.
Drummondville asks that you book an appointment for any planning request that involves meeting an inspector, and states that appointments will become mandatory. A meeting to schedule is one more step in the calendar, better secured early than discovered once the opening date has been set.
Preparing your project in Drummondville
- Describe how the premises are used during the period concerned
- Define which portions can be cleared together, and in what order
- Settle the phasing before the first pass rather than during the survey
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 everything have to be cleared at once?
No, phasing is common. What matters is that it is decided before the first pass, so the covered portions join up cleanly on the final drawing.
What happens to a portion that stays occupied?
It is recorded as not covered, and can be surveyed on a later pass. The report must clearly separate the portions surveyed from those that were not.
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