Inadequate construction practices and premature deterioration of concrete is not only costly but poses a safety threat to the community at large. CSA Group has created this standard to provide requirements for concrete materials and for the methods of manufacture & testing for all concrete applications -- including, cast-in-place, precast, pre-stressed, architectural, residential and specialty concretes.
CSA A23.4-09 covers concrete pre-cast in manufacturing plants which is shipped off-site, i.e. bridge or large commercial building construction. A sister standard – A23.1-09/A23.2-09 - Concrete Materials and Methods of Concrete Construction/Test Methods and Standard Practices for Concrete – provides the same specifications for residential concrete, which is primarily ready-mixed concrete for new construction, renovations and repair work.
This is the fifth edition of CSA A23.4, Precast concrete - Materials and construction. It supersedes the previous editions, published in 2005, 2000, 1994, and 1978.
This Standard specifies requirements for materials and methods for the manufacture, transportation, and installation of architectural, structural, and specialty precast concrete products.
Note: This Standard should be specified for precast concrete elements used in segmental construction.
This Standard specifies the requirements, in addition to those specified in CAN/CSA-A23.3, for precast concrete shop drawings.
Architectural precast concrete
This Standard deals with the structural adequacy and architectural finishes of architectural precast concrete.
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.
In CSA Standards, 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.