ASTM D6924-2003 Standard Specification for Preformed Thermoplastic Vulcanizate Elastomeric Joint Seals for Bridges《桥用预制热塑硫化弹性体密封件的标准规范》.pdf
《ASTM D6924-2003 Standard Specification for Preformed Thermoplastic Vulcanizate Elastomeric Joint Seals for Bridges《桥用预制热塑硫化弹性体密封件的标准规范》.pdf》由会员分享,可在线阅读,更多相关《ASTM D6924-2003 Standard Specification for Preformed Thermoplastic Vulcanizate Elastomeric Joint Seals for Bridges《桥用预制热塑硫化弹性体密封件的标准规范》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 6924 03Standard Specification forPreformed Thermoplastic Vulcanizate Elastomeric JointSeals for Bridges1This standard is issued under the fixed designation D 6924; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the
2、year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers the material requirements forpreformed thermoplastic vulcanizate (TPV) elastomeric
3、jointseals for bridges. The seal consists of a multiple-web designcomposed of a TPV and functions only by compression of theseal between the faces of the joint with the seal folding inwardat the top to facilitate compression. The seal is installed with alubricant adhesive and is designed to seal the
4、 joint and rejectincompressibles.NOTE 1This specification may not be applicable for seals whoseheight is less than 90 % of its nominal width.1.2 The values stated in inch-pound units are to be regardedas the standard. The values given in parentheses are providedfor information only.1.3 This standard
5、 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 requirements prior to use.2. Referenced Documents2.1 ASTM
6、 Standards:D 395 Test Methods for Rubber PropertyCompressionSet2D 412 Test Methods for Vulcanized Rubber and Thermo-plastic ElastomersTension2D 518 Test Method for Rubber DeteriorationSurfaceCracking2D 573 Test Method for RubberDeterioration in an AirOven2D 575 Test Methods for Rubber Properties in
7、Compression2D 1149 Test Method for Rubber DeteriorationSurfaceOzone Cracking in a Chamber2D 2240 Test Method for Rubber PropertyDurometerHardness2D 4483 Practice for Determining Precision for Test MethodStandards in the Rubber and Carbon Black Industries2D 6338 Classification System for Highly Cross
8、linked Ther-moplastic Vulcanizates (HCTPVs)33. Marking and Ordering Information3.1 Each lot of seal shall be marked with characters of notless than 0.25 in. (6.35 mm) in height on the top of the seal ata maximum of 4 ft (1.22 m) intervals showing the lot number,date of manufacture, and the manufactu
9、ring seal designation.3.2 The purchaser shall specify the anticipated requiredminimum acceptable joint movement, and either the minimumjoint opening, or the nominal width of seal.4. Materials and Manufacture4.1 The seals shall be preformed, and the material shall bevulcanized elastomeric compound us
10、ing a thermoplastic vul-canizate as the compound. A thermoplastic vulcanizate is ablend of a crosslinked rubber and a thermoplastic polymer thatcan be processed on conventional thermoplastic processingmachinery and has the properties of a crosslinked elastomer.Highly crosslinked thermoplastic elasto
11、mers are classifiedaccording to Classification System D 6338. TPV materials aremade in the dynamic vulcanization process. One example of atypical TPV is crosslinked ethylene propylene diene rubberblended with polypropylene. The TPV material can alsocontain processing oils, antioxidants, fillers, or
12、other additives.5. Physical Requirements5.1 The materials shall conform to the physical propertiesprescribed in Table 1.5.2 In the applicable requirements of Table 1 and the testmethods, all deflection shall be based on the nominal width.6. Dimensions and Working Parameters6.1 The size, shape and di
13、mensional tolerances shall be asoutlined in 6.1.1.6.1.1 Measurements used for laboratory testing shall betaken to the nearest 0.01 in. (0.3 mm) and reported/recorded tothe nearest 0.1 in. (3 mm) as the average of three measure-ments. The measured width shall be greater than or equal to thenominal wi
14、dth. The seal height shall not be less than 90 % of1This specification is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.34 onPreformed Joint Fillers and Sealers.Current edition approved July 10, 2003. Published October 2
15、003.2Annual Book of ASTM Standards, Vol 09.01.3Annual Book of ASTM Standards, Vol 08.031Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.the nominal width unless joint recess dimensions or specialdesign considerations dictate the geome
16、try.6.2 Compression Deflection PropertiesThe contact pres-sure expressed in pounds-force per square inch (or pascals)when the seal is compressed to any particular width indicatesthe stress-strain relationship that exists in the seal. Thisrelationship is dependent on both the properties of the elas-t
17、omer and the cross-sectional configuration of the seal. There-fore, for a predetermined allowable pressure, a definitiverelationship will exist and the working limits of the seal may bedefined.6.2.1 The working limits (minimum and maximum degreesof compression) of the seal shall be determined on the
18、 basis ofthe minimum and maximum limits of compressibility (LC minand LC max), and the movement range as specified herein.Seals with nominal width differing from that specified areacceptable, providing the compressed width at LC max is lessthan the minimum anticipated joint opening, and the movement
19、range requirement is met.6.2.2 The minimum limit of compressibility (LC min) isdefined as the compressed width (expressed in terms of percentof nominal width) corresponding to a contact pressure of 3 psi(20.68 kPa). The LC min shall be determined in accordancewith 9.3. For the purpose of calculating
20、 movement range, avalue at 85 % of nominal width shall be used for LC min whenthe measured value of LC min exceeds 85 %.NOTE 2If the seal generates a pressure of 3 psi at 90 % of nominalwidth, LC min equals 85 %. However, if the seal generates 3 psi at 70 %of nominal width, the LC min equals 70 %.6.
21、2.3 The maximum limit of compressibility (LC max) isdefined as the compressed width (expressed in terms of percentof nominal width) corresponding to a contact pressure of 35 psi(241.32 kPa). The LC max shall be determined in accordancewith 9.3. LC max has been designated at 35 psi (241.32 kPa)in ord
22、er to mitigate the tendencies toward pressure decay of theseal during use. A reading of 35 psi is considered an absolutemaximum pressure which should not be exceeded.6.2.4 The movement range of the seal is defined as thenumerical difference between the LC min and the LC maxexpressed in inches (mm).
23、For the purpose of calculating themovement range, a value at 85 % shall be used for LC minwhen the measured value of LC min exceeds 85 %. Forpurposes of acceptance testing, the calculated movement rangeof the seal shall not be less than the specified value.7. Sampling7.1 A lot shall consist of the q
24、uantity for each cross sectionagreed upon between the purchaser and the supplier.7.2 Samples shall be taken at random from each shipment ofmaterial. If the shipment consists of more than one lot, each lotshall be sampled.7.3 The minimum lengths of samples for testing purposesshall be as prescribed b
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