A23.4-05

Preface


This is the fourth edition of CSA A23.4, Precast concrete - Materials and construction.

It supersedes the previous edition, published in 2000 together with CSA A251 in a single volume under the title Precast Concrete - Materials and Construction/Qualification Code for Architectural and Structural Precast Concrete Products. The 2000 edition superseded the editions of CSA A23.4 published in 1994 and 1978.

Scope

1.1 General

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.

1.2 Shop drawings

This Standard specifies the requirements, in addition to those specified in CSA A23.3, for precast concrete shop drawings.

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 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 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; may is used to express an option or that which is permissible within the limits of the standard; and can is used to express possibility or capability. 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.