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Canadian Standards Association
Precast concrete — Materials and construction
November 2009
29.5
Individual precast concrete elements shall be clearly marked with identification as shown on the shop
drawings, including date of casting. Alternatively, precast concrete elements shall be identified with
individual mark numbers and a list provided with required information correlated to mark numbers.
Marking shall be performed as soon as practical after stripping from forms and prior to yarding.
Notes:
(1)
Such markings may be made in the wet concrete, made by tagging (as long as the tags are securely fastened to the
elements), or painted on the elements. In all cases, the markings should remain legible for the longest anticipated
storage period.
(2)
The approximate mass of the elements should be marked on them, particularly in cases where shipping or installation
crews cannot easily identify the masses of the precast elements.
(3)
For on-site quality control, markings should be readable following installation. Alternatively, the installation drawings
may be marked with complete element identification, including date of production.
30 Storage
30.1
Products awaiting delivery shall be stored to minimize twisting, racking, bowing, or warping and to avoid
damage to the product. Manufacturer’s procedures shall indicate how precast members will be stored and
handled.
Notes:
(1)
Often the manner of storage depends on how the product is to be shipped and what limitations the element’s
cross-sections impose on handling.
(2)
Wall panels should be stored in vertical storage racks carefully made so as to minimize bowing or warping of the
panels.
(3)
Panels with a large vertical dimension should be designed to be turned in the air using a double-crane hookup.
30.2
Elements shall be stacked only when the lower elements in a stack will not be damaged and where the risk
of warpage is small. Proper blocking and dunnage shall be used for separation.
30.3
All blocking, dunnage, and protective materials shall be of a type that will not cause damage or
objectionable staining.
Note:
For exposed surfaces, care should be taken that such material does not cause uneven curing that can result in
permanent colour variations.
30.4
Elements that are exposed in the finished structure shall be protected from soiling, staining, and contact
with objectionable matter (see
Clause 30.6
).
30.5
Prestressed elements shall be stored with due allowance for creep, shrinkage, and temperature effects.
Notes:
(1)
The location of supports and any external loading during storage can increase or decrease camber growth. Special
conditions for storage should be shown on the shop drawings.
(2)
Preloading a pretensioned element in the plant can be used to control excessive camber growth.
30.6
Any soiling or weathering of architectural concrete panels that would result in a pattern different from
normal weathering shall be avoided during storage.
Licensed for/Autorisé à Jed Friesen Sold by/vendu par CSA on/le June/18/2015.
~Single user license only. Storage, distribution or use on network prohibited. Permis d'utilisateur simple seulement.
Le stockage, la distribution ou l'utilisation sur le réseau est interdit.