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Canadian Standards Association
Precast concrete — Materials and construction
November 2009
32.6
Connections shall not be modified unless reviewed by the engineer responsible for the connection design.
32.7
All bolted or welded connections shall be made in accordance with the installation drawings. Where
welded connections are required, all welds shall be made in accordance with CSA W47.1.
32.8
Temporary lifting and handling devices cast into the elements shall be removed, retained, and protected
as specified on the installation drawings.
32.9
Where elements in partially completed structures might be damaged by the effects of weather, such as
freezing water in ducts, holes, and inserts, adequate temporary protection shall be provided.
32.10
All discontinuities in corrosion protection on permanent connections shall be repaired. The repair method
shall be specified or reviewed by the engineer responsible for the design of the connections.
Note:
Discontinuities in corrosion protection can result from welding or other installation procedures.
33 Repairs
33.1 General
Defects in and damage to precast concrete elements shall be repaired in a manner that will restore the
specified quality of the product.
Notes:
(1)
This Standard distinguishes between repairs of minor defects or damage, normally referred to as aesthetic repairs (see
Clause 33.2
), and repairs of extensive defects or damage, normally referred to as structural repairs (see
Clause 33.3
).
(2)
Guidance on the prevention, significance, effect, and suggested method of repair of cracks can be found in PCI JR-271
and PCI JR-316.
33.2 Aesthetic repairs
33.2.1
Holes left by lifting or hold-down devices or other temporary inserts shall be repaired where necessary.
Patches on the underside of elements, near the centre, or in the area of variable tensile stresses shall be
bonded by an epoxy resin or other reviewed bonding material.
33.2.2
Bonding agents shall have a proven record of durability and shall be applied under conditions and by
methods specified by the manufacturer.
33.2.3
Where it is necessary to fill surface voids in vertical concrete surfaces or under top forms, these surfaces
shall be sack-rubbed in accordance with Clause 7.7.4.4 of CSA A23.1.
33.2.4
Damaged areas that will be exposed to view and other areas specified by the owner shall be repaired.
Notes:
(1)
When repairs have to match specified architectural finishes, repair mixes should be developed early, following review of
the initial sample. A trial-and-error process is normally required for each newly developed face mix to effectively match
colour and texture. Such trials should allow several weeks for curing and should include outdoor exposure.
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