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
Drummondville’s manufacturing past and your concrete surveys
Drummondville’s industrial shift began with electricity. According to Histoires de chez nous, Southern Canada Power arrived in 1914, acquired the operating rights to six falls on the Saint-François River, bought the generating station built in 1896 at the end of rue des Forges and completed its new hydroelectric complex in 1919. Textile manufacturers followed: Butterfly Hosiery and Canadian H. W. Gossard were announced in November 1919, then Jenckes Canadian Tire Fabrics (1920), Dominion Silk Dyeing & Finishing (1923), Louis Roessel (1924) and Canadian Celanese (1926). The population tripled between 1921 and 1931, from 4,433 to 12,023 residents.
Canadian Celanese, which made cellulose acetate fibres, employed 1,757 workers in 1933 and some 5,000 in 1945, according to the Répertoire du patrimoine culturel du Québec. In 1926 it also built the Carré Celanese, a group of about a dozen red-brick houses for its executives, designed by the architects Ross and MacDonald. The plant closed on March 31, 2000.
The industrial base has since been renewed. Drummond économique counts about 600 manufacturing establishments in the Drummond RCM, several of them international in scale, in an area crossed by highways 20 and 55.
On a manufacturing site served by truck, loading docks and manoeuvring areas receive in winter the snow and meltwater that vehicles carry in. Locate these areas, along with washing zones, drains and places where process liquids reach the slab.
Also indicate repairs already made and their date, so that the map distinguishes original concrete from repaired 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
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 Drummondville.
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.
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 Drummondville: Prise de rendez-vous avec l’urbanisme (in French)
- Histoires de chez nous: Le grand développement industriel de Drummondville (in French)
- Répertoire du patrimoine culturel du Québec: Compagnie Celanese (in French)
- Répertoire du patrimoine culturel du Québec: Carré Celanese (in French)
- Drummond économique: Investir (in French)
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