What would be the class of concrete that must be used for an exposed cantilevered balcony to a house that will be situated within 1 km of a surf coastline or 100m from a non-surf coastline?
The minimum compressive strength rating would be 40MPa, cured in accordance with AS3600 guidelines for exposure classification B2. The “B2” relates to the use of a specific curing practice, with the concrete reaching a minimum compressive strength after 7 days of continuous curing. Also the reinforcement steel must have a minimum of 45mm of effective concrete cover.
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