ASTM_D_7247_-_07ae1.pdf

Designation:D724707a1Standard Test Method forEvaluating the Shear Strength of Adhesive Bonds inLaminated Wood Products at Elevated Temperatures1This standard is issued under the fixed designation D7247;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.1NOTEEditorial corrections were made in 6.2 in April 2008.1.Scope1.1 This standard describes a test method for evaluating thecomparative shear strength of a planar adhesive bond at bothambient and elevated temperatures relative to the performanceof solid wood under the same conditions.The test method isbased on the breaking load after the specimen is exposed toeither ambient or a constant elevated temperature for a speci-fied duration as described in Section 7.This standard does notpreclude the development and implementation of other meth-ods that provide equivalent performance meeting the intent ofthis method.1.2 This test method is intended for the evaluation ofadhesives that can be used to assemble test specimens inaccordance with Test Method D905.The evaluation of othertypes of adhesives,such as the binder systems used forstrand-based products,is beyond the scope of this test method.1.3 This test method is intended for the evaluation ofadhesives as a component of laminated wood products atelevated temperatures.The evaluation of fire performance onfire-rated laminated wood products or assemblies is beyond thescope of this test method.1.4 While it is preferable to use solid wood specimens asdescribed in Section 6 as the control,structural compositelumber products as defined in Specification D5456 shall bepermitted for use provided they are matched with the bondedspecimens in accordance with Section 6 and the ignitiontemperature is not significantly lower than solid wood of thesame species.1.5 The exact formulation of adhesive supplied to themanufacturer of laminated wood products shall be evaluated.Modifications to the adhesive formulation require a separateevaluation unless approved by the manufacturer of the lami-nated wood product,qualified agency,and code evaluationagency.1.6 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.7 This standard does not purport to address all of thesafety concerns,such as the fire hazard,associated with its use.It is the responsibility of the user of this standard to establishappropriate safety and health practices and determine theapplicability of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D905 Test Method for Strength Properties of AdhesiveBonds in Shear by Compression LoadingD907 Terminology of AdhesivesD2395 Test Methods for Density and Specific Gravity(Rela-tive Density)of Wood and Wood-Based MaterialsD2915 Practice for Sampling and Data-Analysis for Struc-tural Wood and Wood-Based ProductsD4933 Guide for Moisture Conditioning of Wood andWood-Based MaterialsD5266 Practice for Estimating the Percentage of WoodFailure in Adhesive Bonded JointsD5456 Specification for Evaluation of Structural CompositeLumber Products2.2 Other Documents:ANSI/AITC A190.1 American National Standard for WoodProducts Structural Glued Laminated Timber3ANSI/AF&PA NDS-2005 National Design Specificationfor Wood Construction(NDS)31This 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 July 15,2007.Published July 2007.Originallyapproved in 2006.Last previous edition approved in 2007 as D7247-07.DOI:10.1520/D7247-07AE01.2For 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.3Available from American Institute of Timber Construction(AITC),7012 S.Revere Parkway,Suite 140,Centennial,CO 80112,http:/www.aitc-glulam.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 Wood Handbook Wood as an Engineering Material43.Terminology3.1 Definitions:3.1.1 Many terms in this test method are defined in Termi-nology D907.4.Significance and Use4.1 A discussion of the issues and limitations associatedwith the measurement of strength properties of adhesive bondsin shear by compression loading is found in Test Method D905.4.2 While various combinations of test temperature and heatexposure duration can be used,the provisions specified in 7.2.4shall be based on the understanding that the objective of thistest method is to evaluate adhesive bond performance justbefore wood begins to burn and the elevated temperature isselected to be slightly below the unpiloted ignition temperatur