1、Designation:D182801(Reapproved 2013)Standard Practice forAtmospheric Exposure of Adhesive-Bonded Joints andStructures1This standard is issued under the fixed designation D1828;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year
2、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 practice covers the procedure for the direct expo-sure of adhesive bonded joints and structures to naturalatmospher
3、ic environments.1.2 The procedure for sheltered atmospheric exposure,suchas a Stevenson screen(1),2of adhesive-bonded joints andspecimens is the same except for the requirements of facingsouth and measurement of solar radiation.1.3 This practice is limited to the procedure by whichsamples are expose
4、d and does not cover the tests that may beused to evaluate the effects of atmospheric exposure on theseadhesive-bonded joints and structures.These samples could beany one of several varieties.1.3.1 A complete structure for test,1.3.2 A section of a structure for test,1.3.3 A complete structure or se
5、ction with strength obser-vations on specimens cut therefrom,1.3.4 Test specimens themselves,or1.3.5 Any of the above,mounted under stress.1.4 Suitable test methods for evaluation of the effects ofexposure include nondestructive qualitative or quantitativeobservations on the same sample at prescribe
6、d intervals,ordestructive tests on separate sets of specimens in accordancewith such tests as Test Method D1002.NOTE1See Test Methods D896 and D897.1.5 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.6 This standard does not p
7、urport 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:3D896
8、 Practice for Resistance of Adhesive Bonds to Chemi-cal ReagentsD897 Test Method for Tensile Properties of Adhesive BondsD907 Terminology of AdhesivesD1002 Test Method for Apparent Shear Strength of Single-Lap-Joint Adhesively Bonded Metal Specimens by Ten-sion Loading(Metal-to-Metal)2.2 ASTM Adjunc
9、ts:ASTM Standard Racks and Pipe Frames Blueprints43.Terminology3.1 Definitions:3.1.1 Many terms used in this practice are defined inTerminology D907.4.Significance and Use4.1 The atmospheric exposure tests described in this prac-tice will evaluate the stability of the adhesive bond only interms of a
10、 particular natural atmosphere.Since the atmosphericconditions vary greatly from year to year,these results will notbe as reproducible as those derived from laboratory agingprocedures.Considerable research has shown that laboratoryartificial weathering tests will not give consistently goodcorrelatio
11、n with outdoor test exposures(2,3,4).5.Exposure Sites5.1 The choice of exposure sites is dependent upon theobjective of the particular test program.5.2 In the cases of both metallic and nonmetallic adherends,choose exposure sites to include variations in average tempera-ture(and temperature range),r
12、elative humidity,and precipita-tion.1This practice is under the jurisdiction of ASTM Committee D14 on Adhesivesand is the direct responsibility of Subcommittee D14.40 on Adhesives for Plastics.Current edition approved July 1,2013.Published July 2013.Originally approvedin 1961.Last previous edition a
13、pproved in 2007 as D1828 01(2007).DOI:10.1520/D1828-01R13.2The boldface numbers in parentheses refer to the list of references at the end ofthis practice.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStand
14、ards volume information,refer to the standards Document Summary page onthe ASTM website.4Blueprints of ASTM standard racks and pipe frames may be obtained fromASTM International Headquarters.Order Adjunct No.ADJD1828.Original adjunctproduced in 1957.Copyright ASTM International,100 Barr Harbor Drive
15、,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.Apparatus6.1 RacksExpose the sample on racks4which are sopositioned that the exposed surfaces are at an angle of 45 tothe horizontal and facing true south.Exceptions to the directionthat the specimens face will be permitted in the case of
16、 beachexposures,where the specimens usually face parallel to thebeach.Place racks on a supporting frame high enough and soconstructed that there will be no background for a distance ofat least 30 cm(11.8 in.)in any direction from the back ofspecimens mounted on them.When the frame is positioned onsoil,ensure that the distance between the bottom edge of anyspecimen and the plane of the cleared area great enough toprevent any undesirable effects of grass or plant growth duringthe period of exposur
