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9.3.1.6.(1)
ApplicationIntent
OS2OP2OH1OH4OS3OS1OS2OP2OH1OS3OS2OP2OS3
ObjectiveOS3 Safety in Use
Attribution
(a) [F20,F80-OS3.1] Applies to elements that support floors or steps.
(a) [F20,F80-OS3.4,OS3.7] Applies where concrete supports or is used in chimneys or fireplaces.
Application
Application 1: 
Minimum compressive strength 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, 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 footing, 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:
  • insufficient compressive strength to resist expected gravity and lateral loads, or
  • the excessive shrinkage, cracking and premature failure of concrete.
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:
  • excessive deflection or vibration of supported wood-frame floors or steps, 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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