1、Designation: E 761 92 (Reapproved 2005)Standard Test Method forCompressive Strength of Sprayed Fire-Resistive MaterialApplied to Structural Members1This standard is issued under the fixed designation E 761; the number immediately following the designation indicates the year oforiginal adoption or, i
2、n 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.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1
3、This test method covers a procedure for measuring thecompressive strength of sprayed fire-resistive material (SFRM)applied to a rigid substrate. These fire-resistive materialsinclude sprayed fibrous and cementitious materials applieddirectly in contact with these structural members. The testmethod i
4、s applicable to laboratory procedure.1.2 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the u
5、ser 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 2092 Guide for Preparation of Zinc-Coated (Galvanized)Steel Surfaces for PaintingE84 Test Method for Surface
6、 Burning Characteristics ofBuilding MaterialsE119 Test Methods for Fire Tests of Building Constructionand MaterialsE 605 Test Methods for Thickness and Density of SprayedFire-Resistive Material (SFRM) Applied to StructuralMembers3. Summary of Test Method3.1 The compressive strength of SFRM applied t
7、o a steelsheet is determined by applying a crushing load normal to thesurface of the specimen. This test method measures the stressat 10 % deformation or at failure, whichever is smaller.4. Significance and Use4.1 The intent of this test method is to determine propertiesof direct-applied SFRM that m
8、ay be used to provide anindication of serviceability. Satisfactory performance of fire-resistive material applied to structural members and assembliesdepends upon its ability while in place to withstand the variousinfluences that may occur during the life of the structure, aswell as upon its satisfa
9、ctory performance under fire tests.4.2 This test method measures the compressive strength ofSFRM and is a measure of the resistance to deformation undera compressive load. It is an indication of the ability of SFRMto remain in place and resist removal during anticipated serviceconditions.5. Apparatu
10、s5.1 Testing MachineAny form of standard hydraulic ormechanical compression testing machine accurate to 0.005 kg(0.01 lb) and 0.25 mm (0.001 in.).5.2 Spherical Bearing Block Assembly, having a planebearing surface of 150 mm (6 in.) square. The upper bearingshall be a spherically seated, hardened met
11、al block firmlyattached at the center of the upper head of the machine. Thecenter of the sphere shall lie at the center of the surface held inits spherical seat, but shall be free to turn in any direction, andits perimeter shall have at least 6-mm (14-in.) clearance fromthe head to allow for specime
12、ns whose bearing surfaces are notexactly parallel (see Fig. 1).5.3 Drying Oven, capable of maintaining temperature andhumidity conditions during the specimen curing cycle, inaccordance with the SFRM manufacturers published require-ments.1This test method is under the jurisdiction of ASTM Committee E
13、06 onPerformance of Buildings and is the direct responsibility of Subcommittee E06.21on Serviceability.Current edition approved May 1, 2005. Published May 2005. Originallyapproved in 1980. Last previous edition approved in 2000 as E 761 92 (2000).2For referenced ASTM standards, visit the ASTM websit
14、e, 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 ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States
15、.6. Materials and Manufacture6.1 This test method requires the application of SFRM inaccordance with manufacturers published instructions. Theapparatus, materials, and procedures used to apply the SFRMfor this test shall be representative of application in the field.6.2 The density of the prepared s
16、ample shall be similar tothe density tested and reported during the Test Methods E119and Test Method E84fire exposure tests or as required by thesponsor of the test.6.3 Determine the density and thickness of each of thelaboratory-prepared specimens. Report in accordance with TestMethods E 605.7. Tes
17、t Specimen7.1 The test specimen shall be SFRM applied to galvanizedsteel sheet, 1.5 mm (0.060 in. (16ga.) minimum thickness, 175by 600 mm (7 by 24 in.). Clean with solvent to remove any oilon the surface to be sprayed, in accordance with Guide D 2092.7.2 Apply the fire resistive material to the galv
18、anized steelsheet at a minimum thickness of 19 mm (34 in.). Individualthickness measurement shall be + 3.0 mm (0.125 in.) with nomeasurement less than 19 mm (34 in.).7.3 Condition the prepared specimen for a period of not lessthan 72 h at room temperature (20 6 10C (68 618F) and atrelative humidity
19、not greater than 60 %. After 72 h, thespecimen may be force dried in a drying oven at 43 6 6C (1106 10F), and at a relative humidity not greater than 60 % untilreaching constant weight.37.4 Testing may be performed after it has been determinedthat the specimen has reached constant weight.7.5 Where n
20、ecessary, even the surface of the specimen attwo areas 150 mm (6 in.) square at opposite ends of thespecimen with an appropriate capping material such as poly-urethane, epoxy, polyester, or other similar materials. The topplane of the capping material shall not exceed the thickest pointof the test a
21、rea of a test specimen with an irregular surface bymore than 1.3 mm (0.05 in.).7.6 Make two compression tests at opposite ends of the testspecimen. Make one density test on the specimen.7.7 Other types of non-compressible backing may be used ifspecified.8. Procedure8.1 Apply the load perpendicular t
22、o the face of the testspecimen, with the bearing block on top of the specimen. Theinitial thickness of the test specimen for deformation calcula-tions shall be the distance between the plane bearing surface ofthe block assembly and the steel (backing) plane, after aninitial load of 0.7 kPa (0.1 psi)
23、 has been applied to thespecimen.8.2 The speed of the moving head of the testing machineshall be not more than 1.3 mm (0.05 in.)/min. Compress thespecimen until either a deformation of 10 % or ultimate load isreached, whichever occurs first.9. Report9.1 Report the following information:9.1.1 Compres
24、sive strength in kilopascals (or pounds-forceper square inch), including weight of spherical test blockassembly at 10 % deformation or at ultimate load, whichever isthe smaller,9.1.2 Mode of failure, and9.1.3 Thickness in millimetres (or inches) and the density inkilograms per cubic metre (or pounds
25、 per cubic foot) of theSFRM.10. Precision and Bias10.1 PrecisionThe precision of the test method is beingdeveloped and will be added when available.10.2 BiasThe procedure in this test method has no biasbecause the value of the compressive strength can be definedonly in terms of a test method.11. Key
26、words11.1 compressive strength; sprayed cementitious; sprayedfibrous; sprayed fire resistive materials (SFRMs)ASTM 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
27、 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 technical committee and must be reviewed every five years andif not revised, either rea
28、pproved 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 consideration at a meeting of theresponsible technical committee, which you may attend. If yo
29、u 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 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual
30、 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).3Although mass is being determined, the term weight is used in this test methodas a field-accepted substitute.FIG. 1 Spherical Bearing Block for Compressive Strength TestE 761 92 (2005)2
