1、Designation: E937/E937M 93 (Reapproved 2015)1Standard Test Method forCorrosion of Steel by Sprayed Fire-Resistive Material(SFRM) Applied to Structural Members1This standard is issued under the fixed designation E937/E937M; the number immediately following the designation indicates the yearof origina
2、l adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon () indicates an editorial change since the last revision or reapproval.1NOTEDesignation was changed to dual and units information was corrected edito
3、rially in August 2015.1. Scope1.1 This test method covers a procedure for measuring thecorrosion to steel induced 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 appl
4、icable only to laboratory proce-dures.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two syst
5、ems may result in non-conformancewith the 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 standard to establish appro-priate safety and health practices and determine the applica-bility of
6、regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2E119 Test Methods for Fire Tests of Building Constructionand MaterialsE605/E605M Test Methods for Thickness and Density ofSprayed Fire-Resistive Material (SFRM) Applied toStructural MembersE631 Terminology of Building Con
7、structions3. 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 and itsenvironment that produces a deterioration of the metal and itsproperties.3.2.2 sp
8、rayed 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-coated,and galvanized steel are sprayed with SFRM and subjected toroom temperature and humidit
9、y 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-tioned.5. Significance and Use5.1 It is the intent of this test method to determine relati
10、vecorrosive 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 various influences that occur during thelife of the structure, as well as upon its satisfa
11、ctory 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 corrosioncharacteristics of steel.6. Apparatus6.1 Standard Temperature Humidity Cabinet, equ
12、ipped tomaintain the temperature at 35 6 1.7C 95 6 3F and a1This test method is under the jurisdiction of ASTM Committee E06 onPerformance of Buildings and is the direct responsibility of Subcommittee E06.21on Serviceability.Current edition approved Aug. 1, 2015. Published August 2015. Originallyapp
13、roved in 1983. Last previous edition approved in 2011 as E937 93 (2011).DOI: 10.1520/E0937_E0937M-93R15E01.2For 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 stand
14、ards Document Summary page onthe ASTM website.3Although “mass” is being determined, the term weight is used in this testmethod as an accepted substitute.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1relative humidity of 95 6 3 %. Th
15、e cabinet and all accessoriesshall be of a material that does not affect the corrosiveness ofthe atmosphere in the cabinet. Additionally, all parts that comeinto contact with the test specimens shall be made of materialthat will not cause electrolytic corrosion. Adequate circulationof the atmosphere
16、 over the specimens shall be provided.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. Thebristle section shall be 127 mm 5 in. long by 19 mm 34 in.wide.7. Materials7.1 This
17、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.7.2 The density of the prepared sample shall be the same asthe density tested and rep
18、orted 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/E605M.7.4 Steel sheets shall be 200 mm by 200 mm 8 in. by 8 in.by minimum 12 gage and sh
19、all 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 sheetseach, in the following categories: bare, shop-coated, andgalvanized steel.8.2 The
20、 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 sets of steel sheetsare referred to as follows:Bare I, II, III, IVShop-coated I, II
21、, 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 1.9.2 Protect the opposite sides and edges of the sheets with asuitable coating. This
22、 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 3mm34 618 in. to all sheets.9.4 Specimens I and III of Respective Sets:9.4.1 Condition the specimens for 240 h at room tempera
23、-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, from eachof the respective sets.9.4.3 Remove all surface rust from I and III of the r
24、espectivesets 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 and IV of Respective Sets:9.5.1 Place the remaining sprayed sheets, specimens II andI
25、V 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 from the cabinet.9.5.3 Remove the SFRM and the protective wax coating,along with all r
26、ust, 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 (see 9.3) and the weight loss at the end ofthe 240-h humidity test (see 9.4) as follows
27、: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, III Sheet to be sprayed with SFRM and to be conditioned,during initial aging period, at
28、 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 Galvanized:Ia, IIa, IIIa, IVa = Original weight of steel (9.1).TABLE 1 Sample WeightsBare Shot-Coated GalvanizedI= Ia=gmm2Ia=gmm2Ia=g
29、mm2Specimens having SFRM,conditioned at roomtemperature (9.4).Ib=gmm2Ib=gmm2Ib=gmm2II = IIa = g mm2IIa=gmm2IIa=gmm2Specimens having SFRM,conditioned for 240 h at35 1.7C (9.5).IIb=gmm2IIb=gmm2IIb=gmm2III = IIIa = g mm2IIIa = g mm2IIIa = g mm2Specimens having SFRM,conditioned at roomtemperature (9.4).
30、IIIb = g mm2IIIb = g mm2IIIb = g mm2IV= IVa=gmm2IVa=gmm2IVa=gmm2Specimens having SFRM,conditioned for 240 h at35 1.7C (9.5).IVb=gmm2IVb=gmm2IVb=gmm2E937/E937M 93 (2015)12Ib, IIIb = Weight of steel after cleaning off SFRMand any rust (9.4.4).IIb, IVb = Weight of steel after cleaning off any rust(9.5.
31、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 sprayed with SFRM).10.2 Calculate the average weight3loss at the end of theinitial aging period (see 9.3), and the average weight loss at theend of
32、 the 240 h humidity test (see 9.4) as follows:LI,III5LI1LIII2LII,IV5LII1LIV2(2)11. Report11.1 Report the following information:11.1.1 Report the name of the SFRM and manufacturer.11.1.2 Report the thickness in millimetres or inches, thedensity of the SFRM in kilograms per cubic metre or poundsper cu
33、bic foot, and the individual and average loss inweight3in g/mm2of each specimen or set, respectively.11.1.3 Report information on the steel including the grade;the nature of the shop coating, including the product name andmanufacturer; the measured dry film thickness; and the elapsedtime (number of
34、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 will be addedwhen completed.13. Keywords13.1 corrosion; sprayed fire-resistive materialsASTM Interna
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38、rds, 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 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 Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 93 (2015)13
