ASTM_D_7469_-_12.pdf

Designation:D746912Standard Test Methods forEnd-Joints in Structural Wood Products1This standard is issued under the fixed designation D7469;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.INTRODUCTIONAdhesive bonded end-joints are used in structural glued wood products.The bond performance ofthese end-joints is only one of several parameters that influence the in-service performance of theseproducts.Evaluating the performance of these end-joints require specific tests.The testing regimen,which may consist of one or more of the test methods specified in thisstandard,is dependent on the type of product,the stage in the manufacturing of the product orsub-components when the testing is to be performed,and the objective of the evaluation.AppendixX1 Appendix X7 provide an overview of considerations for developing a testing regimen.1.Scope1.1 This standard provides test methods for evaluating thestructural capacity and integrity of end-joints in structuralwood products.1.2 End-joints are manufactured by adhesive bonding ofmachined,mated surfaces at the ends of two pieces of lumberto form a joint.Typical end-joint configurations include fingerjoints and scarf joints.The combination of one or moreend-joints and the adjoining sections of the structural woodproduct within the assembly is considered to be the testspecimen.1.3 Off-line test methods include:(1)Axial Tension,(2)Bending,and(3)Cyclic Delamination.1.4 In-line test methods include:(1)Tension Proofload and(2)Bending Proofload.1.5 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.1.6 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:2D9 Terminology Relating to Wood and Wood-Based Prod-uctsD198 Test Methods of Static Tests of Lumber in StructuralSizesD1101 Test Methods for Integrity of Adhesive Joints inStructural Laminated Wood Products for Exterior UseD1151 Practice for Effect of Moisture and Temperature onAdhesive BondsD1183 Practices for Resistance of Adhesives to CyclicLaboratory Aging ConditionsD2559 Specification for Adhesives for Bonded StructuralWood Products for Use Under Exterior Exposure Condi-tionsD2915 Practice for Sampling and Data-Analysis for Struc-tural Wood and Wood-Based ProductsD3434 Test Method for Multiple-Cycle Accelerated AgingTest(Automatic Boil Test)for Exterior Wet Use WoodAdhesivesD4442 Test Methods for Direct Moisture Content Measure-ment of Wood and Wood-Based MaterialsD4444 Test Method for Laboratory Standardization andCalibration of Hand-Held Moisture MetersD5456 Specification for Evaluation of Structural CompositeLumber ProductsD4688 Test Method for Evaluating Structural Adhesives forFinger Jointing LumberD4761 Test Methods for Mechanical Properties of Lumber1These test methods are under the jurisdiction of ASTM Committee D07 onWood and are the direct responsibility of Subcommittee D07.01 on FundamentalTest Methods and Properties.Current edition approved Oct.1,2012.Published October 2012.Originallyapproved in 2008.Last previous edition approved in 2009 as D7469 10.DOI:10.1520/D7469-12.2For 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 States1 and Wood-Base Structural MaterialD7247 Test Method for Evaluating the Shear Strength ofAdhesive Bonds in Laminated Wood Products at ElevatedTemperaturesE4 Practices for Force Verification of Testing MachinesE6 Terminology Relating to Methods of Mechanical TestingE177 Practice for Use of the Terms Precision and Bias inASTM Test Methods3.Terminology3.1 Terms used in these methods shall be as defined inTerminologies D9 and E6 and Practices E4 and E177.3.2 Definitions of Terms Specific to This Standard:3.2.1 delaminationseparation of a bondline due to dimen-sional changes(swelling and shrinkage)of the wood aroundthe joint caused by extreme changes in the moisture content.3.2.2 finger jointa joint formed by bonding two pieces oflumber with ends machined to a mated finger-like profile(Fig.1).3.2.3 finger joint specimenboard segments joined at oneor both ends by finger joints to form an assembly and obtainedfrom a finger joint production line for testing.3