ASTM_C_1691_-_11.pdf

Designation:C169111Standard Specification forUnreinforced Autoclaved Aerated Concrete(AAC)MasonryUnits1This standard is issued under the fixed designation C1691;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()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification covers solid,unreinforced masonryunits manufactured from autoclaved aerated concrete(AAC),acementitious product.This specification addresses dimensionaltolerances,maximum limits for drying shrinkage,and shippingand handling.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand 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:2C1232 Terminology of MasonryC1693 Specification for Autoclaved Aerated Concrete(AAC)3.Terminology3.1 DefinitionsTerms defined in Terminology C1232 shallapply in this specification.4.Classification4.1 AAC masonry units manufactured in accordance withthis specification shall be classified according to their strengthclass.5.Materials and Manufacture5.1 AAC masonry units manufactured in accordance withthis specification shall be composed entirely of AAC materialconforming to Specification C1693.6.Physical Requirements6.1 Compressive StrengthThe compressive strength of theunits shall be determined according to Specification C1693 andshall conform to the requirements of Specification C1693 forthe strength class in which the units are classified.6.2 Dry Bulk DensityThe dry bulk density shall be deter-mined according to Specification C1693 and shall conform tothe requirements of Specification C1693 for the strength classin which the units are classified.6.3 Drying ShrinkageThe drying shrinkage shall be deter-mined in accordance with Specification C1693 and shallconform to the requirements of Specification C1693 for thestrength class in which the units are specified.7.Dimensions and Permissible Variations7.1 The specified dimensions of the units shall be estab-lished by the AAC unit manufacturer.7.2 No overall unit dimension(width,height,or length)shall differ by more than18in.(3 mm)from the correspondingspecified dimension8.Visual Inspection8.1 All units shall be sound and free of defects that wouldinterfere with the proper placing of the unit or impair thestrength or permanence of the construction.Minor imperfec-tions incidental to the usual methods of manufacture,orresulting from customary methods of handling in shipment anddelivery,shall not be deemed grounds for rejection.9.Sampling and Testing9.1 The purchaser or the authorized representative shall beaccorded proper facilities to inspect and sample the units at theplace of manufacture from the lots ready for delivery.10.Rejection and Rehearing10.1 If the shipment fails to conform to the specific require-ments,the manufacturer shall be permitted to sort it,and new1This specification is under the jurisdiction of ASTM Committee C15 onManufactured Masonry Units and is the direct responsibility of SubcommitteeC15.10 on Autoclaved Aerated Concrete Masonry Units.Current edition approved Dec.1,2011.Published December 2011.Originallyapproved in 2009.Last previous edition approved in 2009 as C1391 09.DOI:10.1520/C1691-11.2For 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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 specimens shall be selected by the purchaser from the retainedlot and tested.If the second set of specimens fails to conformto the test requirements,the entire lot shall be rejected.NOTE1Unless otherwise specified in the purchase order,the cost oftests is typically borne as follows:If the results of the tests show that theunits do not conform to the requirements of this specification,the cost istypically borne by the seller.If the results of the tests show that the unitsdo conform to the requirements of this specification,the cost is typicallyborne by the purchaser.11.Keywords11.1 autoclaved aerated concrete(AAC);compressivestrength;density;masonry units;shrinkageSUMMARY OF CHANGESCommittee C15 has identified the location of selected changes to this standard since the last issue(C1691 09)that may impact the use of this standard.(