1、Designation: E937 93 (Reapproved 2011)Standard Test Method forCorrosion of Steel by Sprayed Fire-Resistive Material(SFRM) Applied to Structural Members1This standard is issued under the fixed designation E937; the number immediately following the designation indicates the year oforiginal adoption or
2、, in the case of revision, the year 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 test method covers a procedure for measuring thecorrosion to steel induced
3、 by sprayed fire-resistive material.1.2 These SFRMs include sprayed fibrous and cementitiousmaterials applied directly in contact with the structural mem-bers.1.3 This test method is applicable only to laboratory proce-dures.1.4 The values stated in SI units are to be regarded as thestandard. The va
4、lues given in parentheses are mathematicalconversions to inch-pound units that are provided for informa-tion only and are not considered standard.1.5 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 stan
5、dard 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:2E119 Test Methods for Fire Tests of Building Constructionand MaterialsE605 Test Methods for Thickness and Density of SprayedFi
6、re-Resistive Material (SFRM) Applied to StructuralMembersE631 Terminology of Building Constructions3. Terminology3.1 DefinitionsDefinitions in this test method are in ac-cordance with Terminology E631.3.2 Definitions of Terms Specific to This Standard:3.2.1 corrosionchemical reaction between a metal
7、 and itsenvironment that produces a deterioration of the metal and itsproperties.3.2.2 sprayed fire-resistive materialsmaterials that aresprayed onto substrates to provide fire-resistive protection ofthe substrates.4. Summary of Test Method4.1 In this test method replicate panels of bare, shop-coate
8、d,and galvanized steel are sprayed with SFRM and subjected toroom temperature and humidity conditions and to 240 h ofconditioning in a temperature- and humidity-controlled cham-ber. Corrosion induced under these conditions is determined byweight loss3of the sheets as related to sheets not so condi-t
9、ioned.5. Significance and Use5.1 It is the intent of this test method to determine relativecorrosive properties of direct applied SFRM that provides anindication of serviceability. Satisfactory performance of SFRMapplied to structural members and assemblies depends upon itsability to withstand the v
10、arious influences that occur during thelife of the structure, as well as upon its satisfactory perfor-mance under fire conditions.5.2 This test method evaluates the relative corrosion of steelinduced by SFRM and determines whether the presence ofSFRM increases, decreases, or has no effect on the cor
11、rosioncharacteristics of steel.6. Apparatus6.1 Standard Temperature Humidity Cabinet, equipped tomaintain the temperature at 35 6 1.7C (95 6 3F) and arelative humidity of 95 6 3 %. The cabinet and all accessoriesshall be of a material that does not affect the corrosiveness ofthe atmosphere in the ca
12、binet. Additionally, all parts that comeinto contact with the test specimens shall be made of materialthat will not cause electrolytic corrosion. Adequate circulationof the atmosphere over the specimens shall be provided.1This test method is under the jurisdiction of ASTM Committee E06 onPerformance
13、 of Buildings and is the direct responsibility of Subcommittee E06.21on Serviceability.Current edition approved April 1, 2011. Published May 2011. Originallyapproved in 1983. Last previous edition approved in 2005 as E937 93 (2005).DOI: 10.1520/E0937-93R11.2For referenced ASTM standards, visit the A
14、STM 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.3Although “mass” is being determined, the term weight is used in this testmethod as an accepted substitu
15、te.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.2 Scale, having a capacity of 5 kg and a sensitivity of60.1 g.6.3 Wire Brush, described as “cement mold brush” withbrass wire bristles 25 mm (1 in.) long mounted in a handle. Thebr
16、istle section shall be 127 mm (5 in.) long by 19 mm (34 in.)wide.7. Materials7.1 This test method requires the application of SFRM inaccordance with manufacturers published instructions. Theapparatus, materials, and procedures used to apply the SFRMshall be representative of application in the field
17、.7.2 The density of the prepared sample shall be the same asthe density tested and reported during the Test Methods E119fire exposures or as required by the sponsor of the test.7.3 Determine the density and thickness of each laboratory-prepared specimen. Report in accordance with Test MethodsE605.7.
18、4 Steel sheets shall be 200 mm by 200 mm (8 in. by 8 in.)by minimum 12 gage and shall be: bare steelA36 grade,galvanized steelG60 grade, and shop-coatedA36 gradesteel coated with iron oxide alkyd shop coat primer.8. Laboratory Test Specimens8.1 The three sets of specimens shall consist of four sheet
19、seach, in the following categories: bare, shop-coated, andgalvanized steel.8.2 The steel sheets shall be free of all surface rust. Washthe metal specimens with analytical grade trichlorethylene toremove any oil or grease. Dry at room temperature. For testpurposes of this test method, the duplicate s
20、ets of steel sheetsare referred to as follows:Bare I, II, III, IVShop-coated I, II, III, IVGalvanized I, II, III, IV9. Procedure9.1 Weigh each sheet to the nearest 0.1 g and record theweighed samples as Ia, IIa, IIIa, and IVa for the bare,shop-coated, and galvanized sets, respectively. See Table 1.9
21、.2 Protect the opposite sides and edges of the sheets with asuitable coating. This coating shall be stable under the condi-tions of this test method and shall not promote corrosion;ceresin wax is suggested.9.3 Apply the SFRM at a minimum thickness of 19 6 3mm(34 618 in.) to all sheets.9.4 Specimens
22、I and III of Respective Sets:9.4.1 Condition the specimens for 240 h at room tempera-ture (20 6 5C (68 6 9F) and relative humidity not greaterthan 60 %. Record if a constant weight3was reached.9.4.2 Remove the SFRM, as well as the protective waxcoating, from the steel sheet identified as I and III,
23、from eachof the respective sets.9.4.3 Remove all surface rust from I and III of the respectivesets with the wire brush described in Section 6 and clean withsolvent as described in 8.2.9.4.4 Weigh sheets I and III of the respective sets to thenearest 0.1 g, and record as Ib and IIIb.9.5 Specimens II
24、and IV of Respective Sets:9.5.1 Place the remaining sprayed sheets, specimens II andIV of the respective sets, into the temperature humidity cabinetand keep at 35 6 1.7C (95 6 3F) and a 95 6 3 % relativehumidity for a duration of 240 h.9.5.2 At the completion of the 240-h period, remove thespecimens
25、 from the cabinet.9.5.3 Remove the SFRM and the protective wax coating,along with all rust, from the sheets as described in 9.4.3.9.5.4 Weigh the cleaned sheets to the nearest 0.1 g, andrecord as IIb and IVb.10. Calculation10.1 Calculate the average weight3loss at the end of theinitial aging period
26、(see 9.3) and the weight loss at the end ofthe 240-h humidity test (see 9.4) as follows:LI5Ia 2 IbAILII5IIa 2 IIbAII(1)LIII5IIIa 2 IIIbAIIILIV5IVa 2 IVbAIVwhere:AI= area of steel sheet I, mm2,AII= area of steel sheet II, mm2,AIII= area of steel sheet III, mm2, andAIV= area of steel sheet IV, mm2.I,
27、III Sheet to be sprayed with SFRM and to be conditioned,during initial aging period, at room temperature (see 9.4).II, IV Sheet to be sprayed with SFRM and to be placed intemperature humidity cabinet for 240 h (see 9.5).10.1.1 For Bare, Shop-Coated, and GalvanizedIa, IIa, IIIa, IVa = Original weight
28、 of steel (9.1).Ib, IIIb = Weight of steel after cleaning off SFRMand any rust (9.4.4).IIb, IVb = Weight of steel after cleaning off anyrust (9.5.4).LI,LIII= Loss (g/mm2) at end of initial agingperiod (specimens sprayed with SFRM).LII,LIV= Loss (g/mm2) at end of the 240 h humid-ity test (specimens s
29、prayed with SFRM).TABLE 1 Sample WeightsBare Shot-Coated GalvanizedI = Ia = g/mm2Ia = g/mm2Ia = g/mm2Specimens having SFRM,conditioned at roomtemperature (9.4).Ib = g/mm2Ib = g/mm2Ib = g/mm2II = IIa = g/mm2IIa = g/mm2IIa = g/mm2Specimens having SFRM,conditioned for 240 h at 356 1.7C (9.5).IIb = g/mm
30、2IIb = g/mm2IIb = g/mm2III = IIIa = g/mm2IIIa = g/mm2IIIa = g/mm2Specimens having SFRM,conditioned at roomtemperature (9.4).IIIb = g/mm2IIIb = g/mm2IIIb = g/mm2IV = IVa = g/mm2IVa = g/mm2IVa = g/mm2Specimens having SFRM,conditioned for 240 h at 356 1.7C (9.5).IVb = g/mm2IVb = g/mm2IVb = g/mm2E937 93
31、 (2011)210.2 Calculate the average weight3loss at the end of theinitial aging period (see 9.3), and the average weight loss at theend of the 240 h humidity test (see 9.4) as follows:LI,III5LI1 LIII2LII,IV5LII1 LIV2(2)11. Report11.1 Report the name of the SFRM and manufacturer.11.2 Report the thickne
32、ss in millimetres (or inches), thedensity of the SFRM in kilograms per cubic metre (or poundsper cubic foot), and the individual and average loss in weight3in g/mm2of each specimen or set, respectively.11.3 Report information on the steel including the grade; thenature of the shop coating, including
33、 the product name andmanufacturer; the measured dry film thickness; and the elapsedtime (number of days or hours) between application of shopcoating and application of SFRM.12. Precision and Bias12.1 Precision and bias of this test method have not beendetermined. A statement is being developed and w
34、ill be addedwhen completed.13. Keywords13.1 corrosion; sprayed fire-resistive materialsASTM 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
35、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 technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Y
36、our 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 consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your commen
37、ts 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 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or mu
38、ltiple 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).E937 93 (2011)3
