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9.3.1.9.(1)
ApplicationIntent
OS2OP2OH1OH4OS3OS1
ObjectiveOS1 Fire Safety
Attribution
[F20,F21,F80-OS1.1] Applies where concrete supports or is used in chimneys or fireplaces.
Application
Application 1: 
Minimum and maximum temperatures of 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,
  • crawl space ground cover, and
  • basement floors, including floors of basement garages, providing lateral resistance to foundation walls.
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 excessive loss of water due to evaporation,
  • the freezing of concrete before the initial set,
  • slowed hydration of the concrete, or
  • the freezing and expansion of the excess water not used in hydration.
This is to limit the probability of:
  • a failure to develop sufficient compressive strength before building loads are applied,
  • shrinkage and cracking, or
  • the failure of internal bonds.
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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