CSA - A165 SERIES-04
CSA Standards on concrete masonry units
|Publication Date:||1 March 2004|
This is the fourth edition of the CSA A165 Series, CSA Standards on concrete masonry units. It supersedes the previous editions, published in 1994, 1985, and 1977.
This Series consists of three Standards:
(a) CSA A165.1, Concrete block masonry units;
(b) CSA A165.2, Concrete brick masonry units; and
(c) CSA A165.3, Prefaced concrete masonry units.
CSA A165.1 covers concrete block masonry units suitable for loadbearing and nonloadbearing applications. It classifies concrete block masonry units by four physical properties denoted by facets. These properties include solid content, specified compressive strength, concrete type, and maximum moisture content. The physical properties are based on performance rather than specific material combinations or manufacturing procedures. To fully complete a block unit specification by this Standard, each physical property requires a choice by the specifier for unit performance using an identification code. The specified compressive strengths of units in Table 1 of this Standard, based on average net area of the unit, parallel those identified for the design of masonry in CSA S304.1, Design of Masonry Structures. Specified compressive strength of a unit is calculated according to mean strength and standard deviation, rather than mean strength alone, as in the previous edition. Units having a specified compressive strength greater than 15 MPa are now to be individually marked by the manufacturer. Requirements for the visual appearance of the block unit have been introduced. Additional information is included in the nonmandatory annexes.
CSA A165.2 covers both hollow and solid concrete brick units. The previous edition defined solid units only. Solid units are suitable for loadbearing and nonloadbearing applications, whereas hollow units are limited to nonloadbearing applications. The Standard identifies two grades of units: Grade I, for use in masonry exposed to the weather, and Grade II,for use as backup or interior facing masonry and not for exposure to the weather. Both hollow and solid concrete brick units are classified by their physical properties and the extent of coring and frogging. Physical properties include specified compressive strength, water absorption, and moisture content. The physical property of saturation coefficient used in the previous edition has been removed.
CSA A165.3 specifies the properties of masonry units prefaced during manufacturing. Prefaced masonry units are to satisfy this Standard's requirements for resistance to aging, thermal shock, and freeze-thaw cycling, as well as the requirements of ASTM C 744, Standard Specification for Prefaced Concrete and Calcium Silicate Masonry Units. The base unit for the applied facing is governed by CSA A165.1 or CSA A165.2, as applicable.
This Series of Standards was prepared by the Technical Committee on Concrete Masonry Units, under the jurisdiction of the Strategic Steering Committee on Masonry, and has been formally approved by the Technical Committee. It will be submitted to the Standards Council of Canada as a National Standard of Canada.
(1) Use of the singular does not exclude the plural (and vice versa) when the sense allows.
(2) Although the intended primary application of this Standard is stated in its Scope, it is important to note that it remains the responsibility of the users of the Standard to judge its suitability for their particular purpose.
(3) This publication was developed by consensus, which is defined by CSA Policy governing standardization - Code of good practice for standardization as "substantial agreement. Consensus implies much more than a simple majority, but not necessarily unanimity". It is consistent with this definition that a member may be included in the Technical Committee list and yet not be in full agreement with all clauses of this publication.
(4) CSA Standards are subject to periodic review, and suggestions for their improvement will be referred to the appropriate committee.
(5) All enquiries regarding this Standard, including requests for interpretation, should be addressed to Canadian Standards Association, 5060 Spectrum Way, Suite 100, Mississauga, Ontario, Canada L4W 5N6.
Requests for interpretation should
(a) define the problem, making reference to the specific clause, and, where appropriate, include an illustrative sketch;
(b) provide an explanation of circumstances surrounding the actual field condition; and
(c) be phrased where possible to permit a specific "yes" or "no" answer. Committee interpretations are processed in accordance with the CSA Directives and guidelines governing standardization and are published in CSA's periodical Info Update, which is available on the CSA Web site at www.csa.ca.