ARCHIVED - 9.3.1.7.(1)

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9.3.1.7.(1)


Objective	OS3 Safety in Use
Attribution	(a) [F20,F21,F61-OS3.1] Applies to concrete floors or steps, concrete that supports wood-frame floors or steps, and concrete steps that support guards or handrails. (a) [F20,F21,F61-OS3.4,OS3.7] Applies where concrete supports or is used in chimneys or fireplaces.
Application	Application 1: Mixes for site-batched, cast-in-place concrete that is not required to be reinforced that is used in: footings, foundation walls, walls, columns, grade beams and piers, and fireplaces and chimneys. This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9]. Exceptions: except as stated in: Sentence 9.12.4.1.(1), which applies to concrete in trenches beneath footings, and the second row of Table 9.15.4.2.A., which applies to concrete in foundation walls, where a structural capacity of 15 MPa is inadequate based on the thickness of the wall and the height of the finish ground above the basement floor or crawl space ground cover.
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Intent	Intent 1: To limit the probability of: an inappropriate cement/aggregate ratio, or excessive water in concrete. This is to limit the probability of: aggregate segregation, reduced compressive strength, increased shrinkage and cracking, or low resistance to air and moisture transfer for foundation walls and basement floors, de-icing salts, water absorption or freeze-thaw stresses. This is to limit the probability of: compromised structural integrity, or where concrete supports or is used in an environmental separator, the displacement or failure of required environmental separation elements, which could lead to the deterioration of building elements, which could lead to compromised structural integrity. This is to limit the probability of: uneven concrete floor or step surfaces, which could lead to persons tripping, the failure of supported handrails or guards, which could lead to persons falling, the excessive deflection or vibration of supported wood-frame floors, which could lead to persons losing their balance, tripping or falling, and the failure of fireplaces or chimneys, which could lead to the leakage of combustion products, including carbon monoxide gas, into living space, which could lead to the asphyxiation or acute poisoning of persons. This is to limit the probability of harm to persons.
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