1、Designation: D 6356 98 (Reapproved 2004)Standard Test Method forHydrogen Gas Generation of Aluminum Emulsified AsphaltUsed as a Protective Coating for Roofing1This standard is issued under the fixed designation D 6356; the number immediately following the designation indicates the year oforiginal ad
2、option or, in the case of revision, the 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 test method covers a hydrogen gas and stability testfor aluminum
3、 emulsified asphalt coatings.1.2 The values stated in SI units are to be regarded as thestandard. The inch-pound units given in parentheses are forinformation only.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the
4、 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:2D 1079 Terminology Relating to Roofing, Waterproofing,and Bituminous MaterialsD 2939 Test Methods for Emulsi
5、fied Bitumens Used asProtective CoatingsE 1 Specification for ASTM Thermometers3. Summary of Test Method3.1 A 200 g sample of water based aluminized coating isheated to 51.7 6 1C (125 6 2F) in an Erlenmeyer flask andthe volume in millilitres of hydrogen gas evolved is measured.The test is conducted
6、for one week (168 h) with a reading takenevery 24 h. The test room is to be maintained at 73.4 6 3.6Fin order to standardize gas collection temperature in the buretterecepticle.4. Significance and Use4.1 This procedure measures the amount of hydrogen gasgeneration potential of aluminized emulsion ro
7、of coating.There is the possibility of water reacting with aluminumpigment to generate hydrogen gas. This situation is to beavoided, so this test was designed to evaluate coating formu-lations and assess the propensity to gassing.5. Apparatus and Materials5.1 The assembly of the hydrogen gas generat
8、ion testapparatus is illustrated in Fig. 1. Details of the component partare as follows:5.1.1 Wide Mouth Glass Erlenmeyer Flask, 250-mL capac-ity.5.1.2 Beaker, glass, 250-mL.5.1.3 Burette, standard glass 100-mL graduated with glassstopcock and 0.2 mL divisions.5.1.4 Condenser, glass jacketed, having
9、 the dimensionsshown in Fig. 2.5.1.5 Glass Tubing, standard glass 6.35 mm (14 in.) insidediameter 7.94 mm (516 in.) outside diameter and 127 mm (5in.) length for forming the J tube.5.1.6 Tubing, pure latex amber rubber tubing, 6.35 mm (14in.).5.1.7 Neoprene Rubber Stopper, No. 8 with one hole (pre-f
10、erred connection for glass condenser to 250-mL Erlenmeyerflask).5.1.8 Oil or Water BathConstant temperature immersioncirculating bath capable of temperature control.5.1.9 OilCommercially available mineral oil or suitableheat transfer fluid.5.1.10 ThermometerASTM thermometer having a rangefrom 2 to +
11、 80C (30 to 180F) and conforming to therequirements for thermometer 15C or 15F as prescribed inSpecification E 1.6. Sampling6.1 Sample the material in accordance with Test MethodsD 2939.7. Procedure7.1 Weigh 200 g of the sample directly in the 250-mLErlenmeyer flask ensuring that none coats the neck
12、 where thestopper is placed.1This test method is under the jurisdiction of ASTM Committee D08 on Roofingand Waterproofing and is the direct responsibility of Subcommittee D08.09 onBituminous Emulsions.Current edition approved Sept. 1, 2004. Published September 2004. Originallyapproved in 1998. Last
13、previous edition approved in 1998 as D 6356 98.2For 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.1Copyright AST
14、M International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7.2 Insert the filled flask into the oil or water bath (tempera-ture controlled to 51.7 6 1C (125 6 2F) and connect theglass condenser-stopper into the neck of the flask. Flask shouldbe supported int
15、ernally via flask holder or externally with asuitable clamping device.7.3 Fill the 250-mL beaker with water and insert the100-mL burette and J-tube into the water. Avoid the introduc-tion of water into the J-tube.7.4 Draw the water level to the 100-mL mark on the buretteand close the stopcock.7.5 Re
16、cord the time as the start of the induction period.7.6 Aftera1hinduction period, record the time and thewater level point on the burette. The latter figure is the zeropoint. Do not include the one hour induction period level pointin the calculation and report.7.7 Unless otherwise specified, conduct
17、the test at a roomtemperature of 23.0 6 2C (73.4 6 3.6F) for one week, (168h), with a reading taken every 24 h at the corresponding timethat the zero point was taken. It is recognized that test durationis seven days per week and readings may not be practical onweekends or holidays.7.8 If the gas qua
18、ntity approaches the confines of theburette, the test should be terminated.8. Calculation and Report8.1 Hydrogen Gas EvolutionCalculate the total millilitresof hydrogen gas evolved to the nearest 0.1-mL as follows:H 5 V Z (1)where:H = hydrogen gas evolved in mL,V = volume of water in burette at 168
19、h, andZ = zero point volume of water in burette.8.2 Report the results as the hydrogen gas content to thenearest 0.1 mL.9. Precision and Bias9.1 See Table 1.10. Keywords10.1 emulsified asphalt; hydrogen gas; roofing; stability;water based aluminumFIG. 1 Hydrogen Gas Generation Test ApparatusD 6356 9
20、8 (2004)2FIG. 2 CondenserTABLE 1 Statistical Analysis for Gas Evolution of Emulsion Aluminum Coatings Round Robin ResultsMaterial nVariance ComponentEstimate for LaboratoryVariance ComponentEstimate BetweenLaboratoriesRepeatability2.83=VarMatReproducibility2.83=VarMat1 VarLabEinterlaboratory10 0.92
21、1.88 2.71 4.74Finterlaboratory11 1.42 6.19 3.37 7.81Ginterlaboratory11 3.09 13.72 5.0 11.6Hinterlaboratory11 7.25 9.85 7.62 11.7All materials 11 20.00 5.92 12.6 14.4All laboratoriesD 6356 98 (2004)3ASTM International takes no position respecting the validity of any patent rights asserted in connecti
22、on 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 infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible
23、 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 or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consi
24、deration 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 known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Ba
25、rr 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 ASTM 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).D 6356 98 (2004)4
