ASTM_C_1555_-_03a.pdf

Designation:C 1555 03aStandard Practice forAutoclaved Aerated Concrete Masonry1This standard is issued under the fixed designation C 1555;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.INTRODUCTIONMasonry units of autoclaved aerated concrete(AAC)can be produced with dimensional tolerancesas small as116in.(1.5 mm).As a consequence,AAC masonry units can be laid with mortar jointsapproximately38in.(9 mm)thick,and also with thinner joints.The exterior face of the resultingAACmasonry wall is then protected from the elements using an exterior wythe of masonry,a claddingsystem,or a breathable coating resistant to penetration by liquid water.The interior face can beplastered,furred,or painted.1.Scope*1.1 This practice applies to construction and testing ofmasonry made of AAC units.It includes or references termi-nology,material specifications,and methods of test.It refer-ences specifications and test methods.1.2 UnitsThe values stated in inch-pound units are to beregarded as standard.The values given in parentheses aremathematical conversions to SI units which are provided forinformation only and are not considered standard.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C 270 Specification for Mortar for Unit MasonryC 476 Specification for Grout for MasonryC 1072 Test Method for Method for Measurement of Flex-ural Bond StrengthC 1232 Terminology of MasonryC 1386 Specification for Precast Autoclaved Aerated Con-crete High-Precision Wall Construction UnitsE 72 Methods of Conducting Strength Tests of Panels forWall ConstructionE 96 Test Methods for Water Vapor Transmission of Mate-rialsE 514 Test Method for Water Penetration and LeakageThrough MasonryE 518 Test Methods for Flexural Bond Strength of MasonryE 519 Test Method for Diagonal Tension(Shear)in Ma-sonry Assemblages2.2Other Documents:Autoclaved Aerated Concrete:Properties,Testing and De-sign,RILEM Recommended Practice,RILEM TechnicalCommittees 78-MCA and 51-ALC,E&FN Spon,Lon-don,1993Specification for Masonry Structures(ACI 530.1-02/ASCE6-02/TMS 602-02),as reported by the Masonry StandardsJoint Committee(MSJC),American Concrete Institute(Farmington Hills,Michigan),American Society of CivilEngineers(Reston,Virginia),and The Masonry Society,Boulder,Colorado),20023.Terminology3.1 DefinitionsTerms defined in Terminology C 1232shall apply in this practice.3.2 Definitions of Terms Specific to This Standard:3.2.1 autoclaved aerated concrete(AAC)low-density ce-mentitious product of calcium silicate hydrates in which thelow density is obtained by the formation of macroscopic airbubbles,mainly by chemical reactions within the mass duringthe liquid or plastic phase.The air bubbles are uniformlydistributed and are retained in the matrix on setting,hardening,and subsequent high-pressure steam curing,to produce acellular structure.Material specifications for this product areprescribed in Specification C 1386.3.2.2 thick-bed AAC masonryAAC masonry whose mor-tar joints are approximately38in.(10 mm)thick.1This practice is under the jurisdiction of ASTM Committee C15 on Manufac-tured Masonry Units and is the direct responsibility of Subcommittee C15.10 onAutoclaved Aerated Concrete Masonry Units.Current edition approved June 10,2003.Published August 2003.Originallyapproved in 2003.Last previous edition approved in 2003 as C 155503.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.Copyright by ASTM Intl(all rights reserved);Thu Apr 16 09:56:20 EDT 2009Downloaded/printed byLaurentian University pursuant to License Agreement.No further reproductions authorized.3.2.3 thin-bed AAC masonryAAC masonry whose mortarjoints are approximately116in.(1.5 mm)thick.4.Significance and Use4.1 This practice applies to the materials and methods usedin the construction of AAC masonry.It directly references theAAC materials standards under the jurisdiction of ASTMCommittee C27 and the workmanship standards of the Speci-fication for Masonry Structures,and supplements those work-manship standards with additional requirements particular toAAC masonry.5.Materials5.1 AAC masonry units shall conform to SpecificationC 1386.5.2 Mortar for thi