ASTM_C_1386_-_07.pdf

Designation:C 1386 07Standard Specification forPrecast Autoclaved Aerated Concrete(AAC)WallConstruction Units1This standard is issued under the fixed designation C 1386;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.1.Scope1.1 This specification covers solid nonload-bearing andload-bearing precast concrete wall units made from autoclavedaerated concrete.Precast autoclaved aerated concrete(AAC)isa cementitious product based on calcium silicate hydrates inwhich low density is attained by the inclusion of an agentresulting in macroscopic voids and is subjected to high-pressure steam curing.The precast autoclaved aerated concretewall units are large-size solid rectangular prisms,which are tobe laid using thin-bed mortar.Installed units covered by thisspecification shall be protected against direct exposure tomoisture using a coating material accepted by the AACmanufacturer.1.2 The raw materials used in the production of precastautoclaved aerated concrete are portland cement,quartz sand,water,lime,gypsum or anhydrite,and an agent resulting inmacroscopic voids.The quartz sand used as a raw material maybe replaced by a siliceous fine aggregate other than sand,andusually is ground to a fine powder before use.Fly ash may beused as a sand replacement.The batched raw materials aremixed thoroughly together to form a slurry.The slurry is castinto steel molds.Due to the chemical reactions that take placewithin the slurry,the volume expands.After setting,and beforehardening,the mass is machine cut into units of various sizes.The units then are steam-cured under pressure in autoclaveswhere the material is transformed into a hard calcium silicate.1.3 The values stated in inch-pound units are to be regardedas the standard.The values given in parentheses are forinformation only.1.4 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.See Section 8,Section 9,and Section 10.2.Referenced Documents2.1 ASTM Standards:2C 22/C 22M Specification for GypsumC 33 Specification for Concrete AggregatesC 144 Specification for Aggregate for Masonry MortarC 150 Specification for Portland CementC 332 Specification for Lightweight Aggregates for Insulat-ing ConcreteC 595 Specification for Blended Hydraulic CementsC 618 Specification for Coal Fly Ash and Raw or CalcinedNatural Pozzolan for Use in ConcreteE 4 Practices for Force Verification of Testing Machines3.Classification3.1 AAC units manufactured in accordance with this speci-fication are classified according to their strength class.4.Materials and Manufacture4.1 Raw MaterialsMaterials shall conform to the follow-ing applicable specifications:4.1.1 Portland Cement,Specification C 150.4.1.2 Blended Cements,Specification C 595.4.1.3 Pozzolan,Specification C 618.4.1.4Gypsum,Specification C 22/C 22M.4.1.5 Aggregates,Specifications C 33,C 144,or C 332.5.Physical Requirements5.1 Compressive StrengthThe compressive strength of theunits shall be determined according to Section 8 and shallconform to the requirements of Table 1.5.2 Dry Bulk DensityThe dry bulk density shall be deter-mined according to Section 9 and shall conform to therequirements of Table 1.5.3 Drying ShrinkageThe drying shrinkage shall be de-termined in accordance with Section 10,and the averagedrying shrinkage shall conform to the requirements of Table 1.1This specification is under the jurisdiction ofASTM Committee C27 on PrecastConcrete Products and is the direct responsibility of C27.60 on Precast AutoclavedAerated Concrete.Current edition approved March 1,2007.Published April 2007.Originallyapproved in 1998.Last previous edition approved in 1998 as C 1386 98.2For 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.1Copyright 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 08:53:50 EDT 2009Downloaded/printed byLaurentian University pursuant to License Agreement.No further reproductions authorized.6.Dimensions and Permissible Variations6.1 The dimensions of the units shall be as specified by theAAC manufacturer.6.2 No overall unit dimension(width,height,and length)shall differ by more than18in.(3 mm)from the specifiedstandard dimensions.7.Visual Inspection7.1 All units shall be sound and free of defects that wouldinterfere with the proper placing of the unit or impair thestrength or perm