(1)  Aggregates shall,

    (a)   consist of sand, gravel, crushed rock, crushed air-cooled blast furnace slag, expanded shale or expanded clay conforming to CSA A23.1, “Concrete Materials and Methods of Concrete Construction”, and

    (b)   be clean, well-graded and free of injurious amounts of organic and other deleterious material.

Article Ontario Regulation 332/12 Building Code,   Information published by oncodes.ca for educational purposes only.