Intent 1:
To limit the probability that the use of inappropriate
aggregate materials or the presence of an excessive proportion of
contaminants in aggregates will lead to the premature failure of concrete
under expected environmental or structural loads.
This is to limit the probability of:
- where concrete supports or is used in an environmental
separator
- the compromised integrity of the environmental separator,
or
- an inadequate resistance to air and moisture transfer
through the concrete, and
- where concrete supports or is used in the walls of chimneys
or fireplaces, failure of these walls.
This is to limit the probability of:
- pollutant ingress (from the exterior or from adjacent
interior space, including soil gas, combustion products from parking
garages, and particulates),
- precipitation ingress,
- condensation,
- the ingress of moisture from the ground,
- the leakage of combustion products, 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.