ASTM_D_3535_-_07a_2021.pdf

Designation:D353507a(Reapproved 2021)Standard Test Method forResistance to Creep Under Static Loading for StructuralWood Laminating Adhesives Used Under Exterior ExposureConditions1This standard is issued under the fixed designation D3535;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.Scope1.1 This test method covers adhesives suitable for thebonding of wood,including treated wood,into structurallaminated wood products for general construction,for marineuse,or for other uses where a high-strength generalconstruction,creep-resistant,waterproof adhesive bond is re-quired.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2A125 Specification for Steel Springs,Helical,Heat-TreatedD907 Terminology of AdhesivesD2559 Specification for Adhesives for Bonded StructuralWood Products for Use Under Exterior Exposure Condi-tions3.Terminology3.1 Definitions:3.1.1 glulam,nsynonym for structural-glued-laminatedtimber.3.1.2 structural-glued-laminated timber,nan engineered,stress-rated product of a timber laminating plant comprisingassemblies of specially selected and prepared wood lamina-tions securely bonded together with adhesives,with the fol-lowing characteristics:(1)the grain of all laminations isapproximately parallel longitudinally;and(2)the laminationsmay be comprised of pieces end-joined to form any length,ofpieces placed or glued edge-to-edge to make wider ones or ofpieces bent to curved form during gluing.(Synonym glulam)ANSI/AITC A190.1 2002,American National Standard forWood ProductsStructural Glued Laminated Timber(Editedto conform with ASTM format).3.1.3 For other terms used in this test method,refer toTerminology D907.4.Summary of Test Method4.1 Glued laminations are subjected to a constant load undervarious combinations of temperature and relative humidity.The amount of creep is measured.5.Significance and Use5.1 This test method rates the performance of the adhesivein laminated wood as measured by resistance to creep understatic load.1This test method is under the jurisdiction of ASTM Committee D14 onAdhesives and is the direct responsibility of Subcommittee D14.30 on WoodAdhesives.Current edition approved April 1,2021.Published April 2021.Originallyapproved in 1976.Last previous edition approved in 2013 as D3535 07a(2013).DOI:10.1520/D3535-07AR21.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.15.2 This test method will normally be used in conjunctionwith Specification D2559.6.Apparatus6.1 Compression-Type Creep Tester,as shown in Fig.1,3required for testing the specimens under the static load.Thistester consists of:6.1.1 Base Plate,6.1.2 Four Tension Rods,6.1.3 Spacer Plate,6.1.4 Center Rod,6.1.5 Spring,6.1.6 Top Plate,and6.1.7 Nuts.6.2 Metal Spacers,coated with an effective mold-releaseagent.Seven are needed for each laminate.Dimensions are69.8 mm(234in.)long by 15.9 mm(58in.)wide by 6.4 mm(14in.)thick.Spacers made of other materials may also be usedprovided it does not react with the adhesive and can beremoved without disturbing the specimen.6.3 Oven,capable of maintaining 71 6 2C(160 6 3.6F)and humidity chamber capable of maintaining 26.7 6 2C(806 3.6F)and 90 6 5%relative humidity.NOTE1Some ovens may not be able to accommodate a full lengthcreep tester.Since the test specimen is 276 mm in length,it is permissibleto reduce the“filler pieces”and angles to a length of 267 mm eachallowing pressure to be exerted directly on the test specimen without th