ASTM_C_1452_-_00_2006.pdf

Designation:C 1452 00(Reapproved 2006)Standard Specification forReinforced Autoclaved Aerated Concrete Elements1This standard is issued under the fixed designation C 1452;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 load-bearing and nonload-bearing reinforced autoclaved aerated concrete(AAC)floor,roof,wall,and stair elements used as components for buildingconstruction.Autoclaved aerated concrete is a cementitousproduct based on calcium silicate hydrates in which lowdensity is attained by the inclusion of an agent resulting inmacroscopic voids and is subjected to high-pressure steamcuring.Installed units covered by this specification shall beprotected against direct exposure to moisture using a coatingmaterial accepted by the AAC manufacturer.1.2 The raw materials used in the production of autoclavedaerated concrete are portland cement,quartz sand,water,lime,gypsum or anhydrite,and an agent resulting in macroscopicvoids.The quartz sand used as a raw material may be replacedby a siliceous fine aggregate other than sand and usually isground to a fine powder before use.Fly ash may be used as asand replacement.The batched raw materials are mixed to-gether to form a slurry.The slurry is cast into steel molds.Dueto the chemical reactions that take place within the slurry,thevolume expands.After setting,and before hardening,the massis machine cut with high accuracy into elements of varioussizes.The elements then are steam-cured under pressure inautoclaves where the matrix is transformed into a solid calciumsilicate hydrate.NOTE1LOI up to 12%may be acceptable for production of AACprovided supporting test data is presented by the manufacturer.1.3 The values stated in inch-pound units are to be regardedas the standard.The values given in parentheses are providedfor information only.2.Referenced Documents2.1 ASTM Standards:2A 82/A 82M Specification for Steel Wire,Plain,for Con-crete ReinforcementC 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 ConcreteC 1386 Specification for Precast Autoclaved Aerated Con-crete(PAAC)Wall Construction Units3.Classification3.1 Autoclaved aerated concrete elements manufactured inaccordance with this specification are classified according totheir strength class as shown in Table 1.4.Materials and Manufacture4.1 Raw MaterialsMaterials shall conform to the follow-ing specifications:4.1.1 Quicklime,in accordance with manufacturers speci-fication.4.1.2 Aggregate,in accordance with Specification C 33,C 144,or C 332.4.1.3 Portland Cement,in accordance with SpecificationC 150.4.1.4 Blended Cements,in accordance with SpecificationC 595.4.1.5 Gypsum,in accordance with Specification C 22/C 22M.4.1.6 Pozzolan,in accordance with Specification C 618.4.1.7 Gas-producing agent conforming to the manufactur-ers specification.4.2 Steel ReinforcingSteel reinforcing shall conform tothe following specification and the requirements of Table 2.4.2.1 Steel Wire,in accordance with Specification A 82.5.Physical Requirements5.1 Compressive StrengthThe compressive strength of theAAC material shall be determined according to SpecificationC 1386 and shall conform to the requirements of Table 1.1This specification is under the jurisdiction of ASTM Committee C-27 onPrecast Concrete Products and is the direct responsibility of Subcommittee C27.60on Precast Autoclaved Aerated Concrete.Current edition approved June 1,2006.Published June 2006.Originallyapproved in 2000.Last previous edition approved in 2000 as C 1452 00.2For 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 09:21:24 EDT 2009Downloaded/printed byLaurentian University pursuant to License Agreement.No further reproductions authorized.5.2 Bulk DensityThe dry bulk density shall be determinedaccording to Specification C 1386 and shall conform to therequirements of Table 1.5.3 ShrinkageThe drying shrinkage of the AAC materialshall be determined according to Specification C 1386 andshall conform to the requirements of Table 1.5.4 Weld-Point Shear StrengthThe weld-point shearstrength in the reinforcement shall be determined in acco