Commentaire
350.05.03 Concrete
The max. 30% slag requirement is a hindrance in achieving the RCP requirements outlined in 350.08.03.04.03 Rapid Chloride Permeability.
This is counterproductive and blends prescriptive and performance requirements.
While the minimum design strength exceeds CSA A23.1 requirements for concrete pavements, a class of exposure is not indicated. Recommendation is to include Class C-2 exposure (I.e. 35MPa Class C-2) which is in line with all current OPSS.MUNI specs.
350.07.03.01 General
When there is an interruption in placing concrete greater than 20 minutes, the surface of the concrete shall be covered with wet burlap.
Since concrete pavements are typically cured with curing compound, is the wet burlap being applied on top of the curing compound? If the concrete pavement is already cured using curing compound, is there even a need to put wet burlap on top? In addition, the burlap needs to be presoaked for 24 hours, meaning it would have to be available at all times on site in case there is an interruption. Recommendation is to include alternative protection methods such as curing compound, poly and wet burlap as options for this clause.
Submitted 21 mars 2023 10:32 AM
Commenter
Spécification de construction pour les chaussées et les bases en béton
PCT Numéro
000-0142
commentaire ID
312
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