Scope

This is the twelfth edition of the combined CSA A23.1/A23.2, Concrete materials and methods of concrete construction/Test methods and standard practices for concrete. These Standards are part of the CSA A23 series on concrete and supersede the previous editions published in 2009, 2004, 2000, 1994, 1990, 1977, 1973, 1967, 1960, 1942, and 1929. There have been many technical, editorial, and formatting changes throughout this edition; the most significant technical changes are as follows: (a) Inclusion of the ability to use blends of Portland-limestone cement and supplementary cementing materials for sulphate-classes of exposure (S-1, S-2, S-3). Such cementing materials are to be used with well-defined compositional and testing requirements, as outlined in Clause 4.1.1.6.2 and Tables 2, 3 and 7. This change follows upon the introduction of Portland-limestone cements in the 2009 A23.1 edition.(b) Refinement of the treatment of residential concrete (R classes of exposure), which is now integrated into the main tables (Tables 1 and 2), and improvements to the requirements of such concretes have been adopted (Table 2). This change follows upon the initial adoption of R class concretes into A23.1 in the 2009 version of this Standard. The reader's attention is drawn to Note 1 of Clause 9.1. (c) Clarification of the various responsibilities for those involved in concrete construction are given within Clause 4. (d) Clause 4 now includes a provision for the option to optimize the gradation of the entire aggregate component (coarse and fine combined). (e) A new Annex Q outlines a simple method to optimize combined aggregate gradation. (f) More specific instructions concerning concrete temperature limits and construction requirements for cold- and hot-weather concreting are contained within Clause 7. (g) Within Clause 8, new sections deal with controlled low-strength material and shotcrete. (h) Two new exposure-classes of concrete are defined in Tables 1 and 2: N-CF class pertains to interior concrete floors with a steel-trowel finish and A-XL, similar to the C-XL class, is for structurally reinforced concrete exposed to manure or silage gases or both.(i) Other significant modifications to the technical requirements of the various exposure classes can be found in Table 2. (j) A new Annex O on aggregates made from recycled concrete for use in hydraulic cement concrete has been added. (k) A new Annex P provides information on the impact of sulphides in concrete aggregates on concrete behaviour. (l) A new Annex R provides guidelines for residential concrete construction. This Annex reinstates much of the construction guidance previously found in the CSA A438 standard, which has been withdrawn. (m) For CSA A23.2, there has generally been an extensive review, restructuring, and modernization of this Standard to provide a consistent suite of relevant test methods. (n) Two new test methods have been added to CSA A23.2: A23.2-22C, Scaling resistance of concrete surfaces exposed to deicing chemicals using mass loss, and A23.2-23C, Electrical indication of concrete's ability to resist chloride ion penetration.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	Canadian Standards Association
Pages
ISBN