1、Designation: E 937 93 (Reapproved 2005)An American National StandardStandard Test Method forCorrosion of Steel by Sprayed Fire-Resistive Material(SFRM) Applied to Structural Members1This standard is issued under the fixed designation E 937; the number immediately following the designation indicates
2、the year oforiginal adoption 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 procedure for measuri
3、ng 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 applicable only to laboratory proce-dures.1.4 The values stated in SI units are to be
4、 regarded as thestandard. The values given in parentheses are for informationonly.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 d
5、etermine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2E119 Test Methods for Fire Tests of Building Constructionand MaterialsE 605 Test Methods for Thickness and Density of SprayedFire-Resistive Material (SFRM) Applied to StructuralMembersE 631
6、Terminology of Building Constructions3. Terminology3.1 DefinitionsDefinitions in this test method are in ac-cordance with Terminology E 631.3.2 Definitions of Terms Specific to This Standard:3.2.1 corrosionchemical reaction between a metal and itsenvironment that produces a deterioration of the meta
7、l 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-coated,and galvanized steel are sprayed with SFRM and subjected to
8、room 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-tioned.5. Significance and Use5.1 It is the intent of this tes
9、t 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 various influences that occur during thelife of the structure,
10、 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 corrosioncharacteristics of steel.6. Apparatus6.1 Standard Tempe
11、rature 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 cabinet. Additionally, all parts that comeinto contact with the
12、 test specimens shall be made of materialthat will not cause electrolytic corrosion. Adequate circulationof the atmosphere over the specimens shall be provided.6.2 Scale, having a capacity of 5 kg and a sensitivity of60.1 g.1This test method is under the jurisdiction of ASTM Committee E06 onPerforma
13、nce of Buildings and is the direct responsibility of Subcommittee E06.21on Serviceability.Current edition approved May 1, 2005. Published May 2005. Originallyapproved in 1983. Last previous edition approved in 2000 as E 937 92 (2000).2For referenced ASTM standards, visit the ASTM website, www.astm.o
14、rg, 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 substitute.1Copyright ASTM Inte
15、rnational, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.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 t
16、est 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 repo
17、rted 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 MethodsE 605.7.4 Steel sheets shall be 200 mm by 200 mm (8 in. by 8 in.)by minimum 12 gage and shall
18、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 ste
19、el 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, II
20、I, 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 coa
21、ting 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 I and III of Respective Sets:9.4.1 Condition the specimens for 240 h at room tempera-t
22、ure (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 re
23、spectivesets 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 andIV
24、 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
25、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 (see 9.3) and the weight loss at the end ofthe 240-h humidity test (see 9.4) as follow
26、s: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, a
27、t 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 of steel (9.1).Ib, IIIb = Weight of steel after cleaning off SFRMand any rust (9.4.4)
28、.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 hu-midity test (specimens sprayed withSFRM).TABLE 1 Sample WeightsBare Shot-Coated GalvanizedI = Ia = g/mm2Ia = g
29、/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/mm2IIb = g/mm2IIb = g/mm2III = IIIa = g/mm2IIIa = g/mm2IIIa = g/mm2Specimens having SFRM,
30、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/mm2E 937 93 (2005)210.2 Calculate the average weight3loss at the end of theinitial aging period (
31、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 thickness in millimetres (or inches), thedensity of the SFRM in kilograms per cubic metre (or
32、 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 the product name andmanufacturer; the measured dry film thickness; and the elapsedtim
33、e (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 will be addedwhen completed.13. Keywords13.1 corrosion; sprayed fire-resistive material
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35、e 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 or for additional standa
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37、tee 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 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).E 937 93 (2005)3
