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9.3.1.7.(1)
ApplicationIntent
OS2OP2OH1OH4OS3OS1OS2OP2OH1OS3OS2OS3OP2
ObjectiveOS3 Safety in Use
Attribution
(c) [F20,F21,F80-OS3.1]
Application
Application 1: 
Mixes for site-batched, cast-in-place concrete that is not required to be reinforced that is used in garage and carport floors, and exterior steps, including steps providing structural support (to guards or handrails, for example), where exposure to de-icing salts, water from rain or melting snow, freezing and thawing stresses, traffic, abrasion or other severe exposure conditions is likely.
This applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
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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, deicing salts, water absorption or freeze-thaw stresses.
This is to limit the probability of compromised structural integrity, which could lead to:
  • 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.
This is to limit the probability of harm to persons.
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