ASTM_C_587_-_04_2014.pdf

Designation:C58704(Reapproved 2014)Standard Specification forGypsum Veneer Plaster1This standard is issued under the fixed designation C587;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This specification covers calcined gypsum mixed at themill with other ingredients to control working quality andsetting time;specifically designed as a veneer plaster to beapplied over gypsum base for veneer plasters,masonry orconcrete surfaces to a maximum thickness of14in.(6.4 mm)providing a surface ready for decoration.NOTE1Specification C843 contains application procedures for gyp-sum veneer plaster.1.2 This specification covers test methods for determiningthe physical properties of gypsum veneer plasters and sets forthminimum requirements that must be met.1.3 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.1.4 The text of this standard references notes and footnoteswhich provide explanatory material.These notes and footnotesshall not be considered as requirements of the standard.1.5 The following safety hazards caveat applies only to theTest Methods portion,Section 5 of this specification:Thisstandard does not purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2.Referenced Documents2.1 ASTM Standards:2C11 Terminology Relating to Gypsum and Related BuildingMaterials and SystemsC473 Test Methods for Physical Testing of Gypsum PanelProductsC843 Specification for Application of Gypsum Veneer Plas-terC1396/C1396M Specification for Gypsum Board3.Terminology3.1 Definitions:3.1.1 Definitions of terms shall be in accordance withTerminology C11 and Specification C843.3.2 Definitions of Terms Specific to This Standard:3.2.1 gypsum veneer plaster systems,nveneer plasterapplied in accordance with Specification C843 to gypsum basefor veneer plasters.4.Physical Properties4.1 Joint StrengthGypsum veneer plaster systems appliedin accordance with Specification C843 shall be tested inaccordance with 5.9.The breaking load shall be not less thanthe parallel to surfacing loads specified in Specification C1396/C1396M.4.2 Bond StrengthThe bond strength of the gypsum ve-neer plaster to the gypsum veneer base and,where applicable,between the base coat plaster and the finish coat shall notdelaminate when tested in accordance with 5.6.4.3 Impact StrengthGypsum veneer plaster systems shallnot crack or lose bond beyond the impact area when tested inaccordance with 5.7.4.4 FlexureGypsum veneer plaster systems shall exhibitcrack resistance within the field of the gypsum base for veneerplasters such that radial or random cracking shall extend notmore than12in.(13 mm)from the break line at failure whentested in accordance with 5.8.At rupture of the panel theveneer plaster shall be securely bonded to the face paper.5.Test Methods5.1 MaterialsGypsum Base for Veneer Plaster,see Speci-fication C1396/C1396M.5.2 SamplingSample not less than 1%of the packages,but not less than 5 packages.Select packages to be sampled atrandom.Take samples both from the outer portion and the1This specification is under the jurisdiction of ASTM Committee C11 onGypsum and Related Building Materials and Systems and is the direct responsibilityof Subcommittee C11.01 on Specifications and Test Methods for Gypsum Products.Current edition approved April 1,2014.Published April 2014.Originallyapproved in 1966.Last previous edition approved in 2009 as C587 04(2009).DOI:10.1520/C0587-04R14.2For 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 center of each package.Thoroughly mix the materials soobtained to provide a composite sample of not less than 15 lb(6.8 kg).Place this composite sample immediately in a clean,dry,airtight container for delivery to the laboratory.5.3 Test Unit PreparationFrom the sample,prepare panelsof veneer plaster system and cut four 2 ft(600 mm)square,andthree 12 by 16 in.(300 by 400 mm)specimens.5.4 ConditioningCondition specimens to constant weightat a temperature of 85 6 15 F(29.5 6 8.5 C)and relativehumidity of 50 6