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9.3.1.7.(1)
ApplicationIntent
OS2OP2OH1OH4OS3OS1OS2OP2OH1OS3OS2OS3OP2
ObjectiveOH1 Indoor Conditions
Attribution
(b) [F20,F21,F80,F61,F55-OH1.1,OH1.2] [F20,F21,F80,F61-OH1.3]
Application
Application 1: 
Mixes for site-batched, cast-in-place concrete that is not required to be reinforced that is used in floors, in 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 Clause 9.3.1.7.(1)(c), which applies to concrete for garage and carport floors 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.
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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.
Where concrete is used in an environmental separator, this is to limit the probability of:
  • the compromised integrity of the environmental separator, or
  • an inadequate resistance to air and moisture transfer through the concrete.
This is to limit the probability of:
  • pollutant ingress (from the exterior, including soil gas)
  • condensation,
  • the ingress of moisture from the ground, or
  • the compromised thermal performance of components intended to provide resistance to heat transfer.
This is to limit the probability of:
  • the generation of pollutants from biological growth or from materials that become unstable on wetting,
  • deterioration, which could lead to further compromised integrity of environmental separators, or
  • an inadequate control of indoor air and surface temperatures, drafts, relative humidity, or water accumulation.
This is to limit the probability of:
  • negative effects on the air quality of indoor spaces,
  • the inadequate thermal comfort of persons, and
  • contact with moisture.
This is to limit the probability of harm to persons.
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