The Ontario Building Code | Aggregates
9.3.1.4. Aggregates
(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.
In Plain Language
Aggregates used in concrete, meaning the sand and gravel mixed with cement, must conform to the standards referenced in this article, ensuring the finished concrete has consistent strength and durability.
This is a plain-language summary of the 2012/2017 Ontario Building Code text above, for general understanding only and not a substitute for the Code. Always confirm current requirements against the 2024 edition (O.Reg. 163/24) or a qualified professional before construction.