1、Designation: D8138 18Standard Specification forPreformed Silicone Joint Sealing System for Bridges1This standard is issued under the fixed designation D8138; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision
2、. 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 covers the material requirements forpreformed silicone joint seals for bridges. The seal consists ofa silicone r
3、ubber gland preformed to a continuous length. Itsdesign shall prevent any tension from occurring in the seal orbonding point during normal movement. The seal is installedby bonding it to the joint header with a silicone-based adhesiveand is designed to seal the joint, preventing liquid intrusion.1.2
4、 The values given in parentheses are mathematical con-versions to SI units that are provided for information only andare not considered standard.1.3 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 stand
5、ard to establish appro-priate safety, health, and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on
6、 Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2C639 Test Method for Rheological (Flow) Properties ofElastomeric SealantsC679 Test Metho
7、d for Tack-Free Time of Elastomeric Seal-antsC793 Test Method for Effects of Laboratory AcceleratedWeathering on Elastomeric Joint SealantsD395 Test Methods for Rubber PropertyCompression SetD412 Test Methods for Vulcanized Rubber and Thermoplas-tic ElastomersTensionD573 Test Method for RubberDeteri
8、oration in an AirOvenD624 Test Method for Tear Strength of Conventional Vul-canized Rubber and Thermoplastic ElastomersD2240 Test Method for Rubber PropertyDurometer Hard-ness3. Materials and Manufacture3.1 The seals shall be preformed to a continuous length, andthe material shall be silicone rubber
9、.3.2 The adhesive shall be a silicone-based adhesive.4. Physical Requirements4.1 The materials for the seal shall conform to the physicalproperties prescribed in Table 1.4.2 The materials for the adhesive shall conform to thephysical properties prescribed in Table 2.4.3 In the applicable requirement
10、s of Table 1 and the testmethod, all deflection shall be based on the nominal width.5. Dimensions and Working Parameters5.1 The size, shape, and dimensional tolerances shall be asoutlined in 5.2.5.2 Measurements used for physical laboratory testing shallbe taken to the nearest 0.01 in. (0.3 mm) and
11、reported/recordedto the nearest 0.1 in. (3 mm) as the average of the measure-ments. The measured width shall be greater than or equal to thenominal width. Measurements shall be taken at quarter pointsof the sample.5.3 The lengths of samples for performance testing purposesshall be 2 ft 6 0.25 in. (6
12、01 6 6 mm) length for the seal andappropriate amount of silicone-based adhesive per manufac-turers recommendation.6. Sampling6.1 Samples shall be taken at random from each shipment ofmaterial. If the shipment consists of more than one lot, each lotshall be sampled.6.2 A lot shall consist of the quan
13、tity for each copioussection agreed upon between the purchaser and the supplier.1This specification is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.32 onBridges and Structures.Current edition approved April 1, 2018. Pub
14、lished April 2018. Originallyapproved in 2018. DOI: 10.1520/D8138-18.2For 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
15、website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment
16、of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.17. Specimen Preparation7.1 All tests in Tables 1 and 2 shall be done in accordancewith the referenced ASTM test method.7.2 All performance test specimens cut sha
17、ll be square towithin 2 and smooth, with no roughness visible to the nakedeye and cleaned of debris. This process will eliminate irregu-larities. The 2-ft (601-mm) long test specimens shall be fullyinstalled with the adhesive per manufacturer recommendationson a steel or concrete surface, or both, s
18、imulating a bridgejoint.8. Test Methods8.1 Compliance with the requirements of Tables 1 and 2shall be determined by tests conducted in accordance with themethods specified.8.2 Performance tests shall be run at a sliding speed of2.50 in.min in accordance with the manufacturers suggestedminimum and ma
19、ximum openings.8.3 The joint seal shall be set at its median opening, whichis defined as halfway between the claimed maximum closureand maximum opening. Maximum joint opening shall be aminimum of 50 % higher than the median joint opening. It willbe subject to cyclic loading at a 45 skew angle for 20
20、0 cycleswith movements 6 median design 50 % 1.414 displace-ment at room temperature. A typical cyclic load apparatus isshown in Fig. 1.8.4 The specimen is then cooled for 24 h at 20 F and,within 20 min of removal from conditioning chamber, sub-jected to an additional 50 cycles at a 45 skew angle. An
21、yadhesive or cohesive failures in the form of rips, tears, or bondfailures will be cause for rejection.9. Certification and Acceptance9.1 The acceptance of the preformed silicone joint seal shallbe based upon one of the following procedures, as specified bythe purchaser:9.1.1 A certification of conf
22、ormance to the specificationrequirement. This shall consist of a notarized copy of themanufacturers test report, or a notarized statement by thesupplier accompanied by a copy of the results, certifying thatthe material has been sampled, tested, passed joint cycling test,and inspected in accordance w
23、ith the provisions of the speci-fication. Each certification so furnished shall be signed by anauthorized agent of the manufacturer or supplier.9.1.2 A notarized certification of test results by an indepen-dent testing agent or notarized statement that the material hasbeen sampled, tested, passed jo
24、int cycling test, and inspected inaccordance with the provisions of the specification. Eachcertification so furnished shall be signed by an authorized agentof the testing agency.9.1.3 Testing by the purchaser of any or all propertiesshould be in accordance with the provisions of thespecification.TAB
25、LE 1 Physical Requirements for Preformed Silicone Joint Seal GlandRequirements ASTM Test MethodResistance to accelerated weathering, 5000 h No cracking or degradation C793 Fluorescent UV accelerated weathering tester (QUV)Tensile strength, min, psi 1000 D412Elongation at break, min, % 400 D412Hardne
26、ss, type A durometer, points 55 5 D2240Tear strength, min, ppi 100 D624 Die BCompression set, maxAt 212 F, 70 h, % 30 D395 Method B Specimen 1 or 2Heat-aged properties, 70 h at 212 FDurometer, max, points lost 5 D573Tensile strength, max, % loss 10Elongation, max, % loss 10TABLE 2 Physical Requireme
27、nts for Silicone-Based AdhesiveRequirements ASTM Test MethodTensile strength, min, psi 200 D412Elongation at break, min, % 450 D412Sag/flow, max, in. 3/16 C639Tack-free time, max, minutes 30 C679Resistance to UV, 5000 h No cracking or degradation C793Cure through to14-in. thickness, max, hours 24 at
28、 75 F / 50 % RHD8138 182ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringe
29、ment of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard o
30、r for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views k
31、nown to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting A
32、STM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 1 Typical Performance Testing Apparatus for Cyclic Load TestD8138 183
