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9.3.1.7.(2)
ApplicationIntent
OS2OP2OH1OH4OS3OS1
ObjectiveOS1 Fire Safety
Attribution
[F20,F21-OS1.1] Applies where concrete supports or is used in chimneys or fireplaces.
Application
Application 1: 
Maximum size of aggregate 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,
  • basement floors, including floors of basement garages, subject to hydrostatic pressure or providing lateral resistance to foundation walls,
  • garage and carport floors,
  • exterior steps, including steps providing structural support (to guards or handrails, for example), 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].
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Intent
Intent 1: 
To limit the probability that the concrete will not flow around the aggregate in the typically thin wall and slab sections used in Part 9 buildings, which could lead to aggregate segregation, which could lead to:
  • reduced compressive strength,
  • increased shrinkage and cracking, or
  • low resistance to air and moisture transfer.
This is to limit the probability of:
  • spalling,
  • inadequate performance, or
  • premature failure of concrete under expected environmental or structural loads.
Where concrete supports or is used in chimneys or fireplaces, this is to limit the probability of the compromised integrity of the chimney or fireplace, which could lead to the ignition of combustible building components.
This is to limit the probability of harm to persons.
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