CAN/CSA-A23.1-00/A23.2-00
Concrete Materials and Methods of Concrete Construction/Methods of Test for Concrete
détails du produit
Preface
This is the ninth edition of the combined CSA Standards A23.1, Concrete Materials and Methods of Concrete Construction, and A23.2, Methods of Test for Concrete. It supersedes the previous editions published in 1994, 1990, 1977, 1973, 1967, 1960, 1942, and 1929. These Standards are part of the CSA A23 Series on Concrete and Reinforced Concrete.
Emphasis in this issue continues to be placed on the durability requirements for concrete. Requirements with respect to curing conditions have been revised. In particular, there are longer curing times required for high-performance concrete. Air void spacing factors are only required for Class C-1, C-2, and F-1 exposure conditions. There are also new tolerances for slab construction.
This edition includes significant changes to the requirements for slump. Slump has generally been considered a measure of consistency and has been indirectly related to the unit water content of the concrete. Historically, a table of recommended slumps for various concrete applications was provided; these slumps were considered acceptable for proper concrete placement, without segregation. The table was eliminated in this edition since the Technical Committee believes that it is no longer meaningful with the advent of improved water-reducing admixtures and new methods of placement. This is consistent with other recognized standards. References have been provided for choosing a slump for those applications where the uniformity of concrete is considered critical.
The use of 100 Ă 200 mm test cylinders is now the default size referenced in this Standard for concrete made with aggregate having a nominal maximum size of 28 mm or less. It should also be noted that the 0.95 correction factor has been eliminated since it was determined to be inappropriate based on recent data.
Revisions have been made to a number of test methods for aggregates. Measures to avoid deleterious expansion in concrete and a standard practice to identify the degree of alkali-aggregate reactivity have been added to CSA Standard A23.2. A standard practice for laboratory testing to demonstrate the effectiveness of supplementary cementing materials and chemical admixtures in preventing alkali-silica reaction in concrete has been added to CSA Standard A23.2 as well.
Appendix B, dealing with alkali-aggregate reaction, has been substantially revised. The changes in Appendix B and the two new standard practices may have a significant impact on the supply of concrete formulated to prevent deleterious alkali-aggregate reaction. A new test method for testing the resistance of coarse aggregate to degradation by abrasion in the Micro-Deval Apparatus has been added to CSA Standard A23.2.
Where a change or addition to the previous edition of the Standard has been made, the Clause, Table, Title, or Appendix affected is identified by the delta symbol.
The contents of CSA Standards A23.1 and A23.2 are based on the principle that the document should be self-contained for use in the field.
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A23.1-00 - Concrete Materials and Methods of Concrete Construction
Scope
1.1 General
This Standard provides the requirements for materials and methods of construction for cast-in-place concrete and concrete precast in the field.
Notes:
(1) Requirements for the design of concrete structures are provided in CSA Standards A23.3 and S6. Design of some specialty concrete products is described in separate CSA Standards.
(2)Â Methods of test for concrete are provided in CSA Standard A23.2.
(3)Â Design provisions governing the fire resistance of reinforced concrete structures are set out in the National Building Code of Canada.
1.2 Precast Concrete
Requirements for the plant production of precast concrete are set out in CSA Standard A23.4.
1.3 Precasting of Concrete in the Field
Precasting of concrete in the field or in a temporary plant is governed by this Standard or by CSA Standard A23.4, at the option of the owner.
Notes:
(1)Â Guidelines for such a choice are provided in CSA Standard A23.4.
(2)Â Precasting operations in the field that are normally governed by this Standard, such as tilt-up construction, are described in Clause 26.
1.4 Approval for Equivalents
This Standard does not specifically cover the use of proprietary materials or methods of construction. They may be permitted by the owner under a separate specification, provided that the quality of the resulting construction meets the minimum requirements of this Standard.
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A23.2-00 - Methods of Test for Concrete
Scope
1.1 General
This Standard covers the principal methods of test for hardened and freshly mixed concrete and for concrete materials, as specified in CSA Standards A23.1 and A23.4.
1.2 Safety and Health Practices
This Standard does not purport to address the safety problems associated with its use. It is the responsibility of the user of this Standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
1.3 Metric Conversion
This Standard is presented in metric units in accordance with CSA Standard Z234.1.
Note:Â The ASTM Standards that are referenced herein are often based on the Imperial system, with soft metric equivalents.
Where ASTM Standards are referenced, the appropriate metric units in the ASTM Standards should be used wherever possible.
When the ASTM Standards refer to other ASTM Standards for which there are equivalent CSA Standards, the latter Standards should be used to ensure a continuity in such things as sieve sizes, metric units, and other particular differences between the Standards.
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