CSA A23.4:2016 pdf download.Precast concrete - Materials and construction
1.3 Architectural precast concrete
This Standard deals with the structural adequacy and architectural finishes of architectural precast concrete.
1 4 Precedence
Where this Standard states that the content of a clause is required to conform to a referenced Standard and to additional clauses of this Standard and there is a conflict between the referenced Standard and the requirements of this Standard, the requirements of this Standard take precedence.
1.5 Terminology
In this Standard, "shall" is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; "should" is used to express a recommendation or that which is advised but not required; and“may" is used to express an option or that which is permissible within the limits of the Standard.
Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.
Notes to tables and figures are considered part of the table or figure and may be written as requirements.
Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.
4.1.2 Group A (architectural products)
Group A shall include products that are decorative and establish the aesthetic character of a structure.
These products shall be produced in accordance with the requirements of this Standard. Group A is divided into two categories:
a) Architectural trim units (AT) shall be non-prestressed products with a high standard of finish quality and of relatively small size and may be installed with equipment of limited capacity. Products include sills, lintels, coping, cornices, quoins, medallions, bollards, benches, planters, and pavers.This category also includes specialty products specifically designed for a project but not commodity or ornamental units produced for wholesale or retail purposes.
b) Architectural cladding and load bearing units (A1) shall be precast concrete building elements such as exterior cladding, load bearing and non-load bearing wall panels, spandrels, beams, mullions, columns, column covers, and other miscellaneous shapes. Elements may be conventionally reinforced and/or pretensioned or post-tensioned. Prequalification in this category includes category AT.
Note: Group A does not include structural products that exhibit a high degree of finish or texture, including unique colouration. Such products are included in Groups B and C.
4.1.3.3 Group BA
Group BA products shall be produced with the additional requirements for architectural finishes. Group BA is divided into the same four categories as Group B and shall be designated Categories BA1, BA2,BA3, and BA4. The category descriptions are identical with the category descriptions for Group B except that the manufacturer shall have the capability to apply architectural finishes in accordance with the provisions of this Standard. Prequalification in each BA category shall include the preceding BA categories and shall supersede the equivalent Group B category.CSA A23.4 pdf download.