1、Designation:E128908(Reapproved 2016)Standard Specification forReference Specimen for Sound Transmission Loss1This standard is issued under the fixed designation E1289;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last r
2、evision.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 specification describes the construction and instal-lation of standard reference specimens for quality control oflaboratory
3、sound transmission loss measurements using TestMethod E90.1.2 Laboratories may choose to construct and test all of thereference specimens described here or only a subset.Specificspecimens may be required by a test method or an accreditingagency.1.3 The values stated in SI units are to be regarded as
4、standard.The values given in parentheses are for informationonly.2.Referenced Documents2.1 ASTM Standards:2C634 Terminology Relating to Building and EnvironmentalAcousticsE90 Test Method for Laboratory Measurement of AirborneSound Transmission Loss of Building Partitions andElements3.Terminology3.1
5、DefinitionsFor definitions of terms used in thisspecification,see Terminology C634.4.Construction of Reference Specimen4.1 General:4.1.1 The reference specimen is composed of framed steelpanels.The required materials for fabrication and installationare as follows:Galvanized steel sheetswidth,1220 mm
6、(4 ft);nominal thickness,0.63 mm(24 gauge).The weight of the sheets shall be 5.1 0.7 kg/m2(1.05 0.15 lb/ft2).Steel right angles with 25-mm(1-in.)flangesmetal thickness,3.2 mm(18in.).Blind rivetsdiameter,3.2 mm(18in.).Duct tape,50 mm(2 in.)wide.Drywall screws,Type Wlength,32 mm(1.25 in.).Bolts#1024 2
7、5 mm(1 in.)long with appropriate nuts and washers.Fasteners,to hold wood frame to the perimeter of the test opening.Non-hardening,caulking,Nominal 2 by 4 in.wood framing,approximately 40 by 90 mm.NOTE1The quantity and length of each component needed dependson the size of the laboratory test opening.
8、NOTE1To simplify cleaning,the wood framing used to support thesteel panels may be painted.4.1.2 The weight of each component of the referencespecimen and the assembled specimen shall be measured andkept on record.In addition,the thickness of each of the steelpanels shall be measured in six locations
9、.(See Appendix X1.)4.2 Assembly:4.2.1 Galvanized SheetsThe length of each galvanizedsheet shall be a few millimetres less than the height of thelaboratory test opening.The total width of all the sheets shallbe a few millimetres less than the width of the laboratory testopening.This may require that
10、one or more sheets be cutlengthwise.The intent is that,when installed,the panels fill thetest opening completely.4.2.2 FrameCut steel right angles to size to form a framefor each sheet;the frame shall have the same outside dimen-sions as the sheets.Notch and weld the steel angles to form thefour cor
11、ners of the frame as shown in Fig.1.Alternatively,miter the angles and weld similarly.Smooth corners afterwelding.4.2.3 PanelsConstruct a panel by riveting steel sheets tothe frames as follows:04.2.3.1 Drill holes at 100 mm(4 in.)on-center around theperimeter of the sheets for the installation of th
12、e blind rivets.Toensure proper alignment of the sheets with the frame,it isrecommended to drill a few holes and then install rivets to holdthe sheet in place.Once this is done,the remaining holes maybe drilled and the rivets installed.Position these holes to avoidconflict with the clearance holes de
13、scribed in 4.2.3.2.4.2.3.2 Drill 4 mm(532inch)diameter holes through thehorizontal members of the frame and sheet as shown in Fig.2.These are clearance holes for the drywall screws used to attachthe panel to the wood plate(see 5.4).Drill similar holesthrough the vertical members of the panels that w
14、ill be used toattach the assembled specimen to the vertical wood plates.Thespacing between these holes is not important.1This specification is under the jurisdiction of ASTM Committee E33 onBuilding and Environmental Acoustics and is the direct responsibility of Subcom-mittee E33.03 on Sound Transmi
15、ssion.Current edition approved May 1,2016.Published May 2016.Originallyapproved in 1989.Last previous edition approved in 2008 as E1289 08.DOI:10.1520/E1289-08R16.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of
16、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 4.2.3.3 Drill 6.4 mm(14in.)diameter holes at 406 mm(16in.)on-center through the vertical flanges of the steel frame.These are clearance holes for the bolts used to connect thepanels together(see 5.3 and Fig.3).The holes in adjacentvertical members should be carefully aligned with each other t
