1、Designation: E761 92 (Reapproved 2011)Standard Test Method forCompressive Strength of Sprayed Fire-Resistive MaterialApplied to Structural Members1This standard is issued under the fixed designation E761; the number immediately following the designation indicates the year oforiginal adoption or, in
2、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.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 Thi
3、s 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 is a
4、pplicable to laboratory procedure.1.2 The values stated in SI units are to be regarded asstandard. The values given in parentheses are mathematicalconversions to inch-pound units that are provided for informa-tion only and are not considered standard.1.3 This standard does not purport to address all
5、 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 regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D2092 Guide for Prepa
6、ration of Zinc-Coated (Galvanized)Steel Surfaces for Painting3E84 Test Method for Surface Burning Characteristics ofBuilding MaterialsE119 Test Methods for Fire Tests of Building Constructionand MaterialsE605 Test Methods for Thickness and Density of SprayedFire-Resistive Material (SFRM) Applied to
7、StructuralMembers3. Summary of Test Method3.1 The compressive strength of SFRM applied to 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.
8、1 The intent of this test method is to determine propertiesof direct-applied SFRM that may 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 vario
9、usinfluences that may occur during the life of the structure, aswell as upon its satisfactory 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 SF
10、RMto remain in place and resist removal during anticipated serviceconditions.5. Apparatus5.1 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 surfac
11、e of 150 mm (6 in.) square. The upper bearingshall be a spherically seated, hardened metal 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
12、 perimeter shall have at least 6-mm (14-in.) clearance fromthe head to allow for specimens whose bearing surfaces are notexactly parallel (see Fig. 1).1This test method is under the jurisdiction of ASTM Committee E06 onPerformance of Buildings and is the direct responsibility of Subcommittee E06.21o
13、n Serviceability.Current edition approved April 1, 2011. Published August 2011. Originallyapproved in 1980. Last previous edition approved in 2005 as E761 92 (2005).DOI: 10.1520/E0761-92R11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at servi
14、ceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Withdrawn. The last approved version of this historical standard is referencedon www.astm.org.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Cons
15、hohocken, PA 19428-2959, United States.5.3 Drying Oven, capable of maintaining temperature andhumidity conditions during the specimen curing cycle, inaccordance with the SFRM manufacturers published require-ments.6. Materials and Manufacture6.1 This test method requires the application of SFRM inacc
16、ordance 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 sample shall be similar tothe density tested and reported during the Test Methods E119and
17、 Test Method E84 fire 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 E605.7. Test Specimen7.1 The test specimen shall be SFRM applied to galvanizedsteel sheet, 1.5 mm (
18、0.060 in. (16 ga.) minimum thickness,175 by 600 mm (7 by 24 in.). Clean with solvent to removeany oil on the surface to be sprayed, in accordance with GuideD2092.7.2 Apply the fire resistive material to the galvanized steelsheet at a minimum thickness of 19 mm (34 in.). Individualthickness measureme
19、nt 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 6 18F) and atrelative humidity not greater than 60 %. After 72 h, thespecimen may be force dried in a drying oven at 43
20、 6 6C(110 6 10F), and at a relative humidity not greater than 60 %until reaching constant weight.47.4 Testing may be performed after it has been determinedthat the specimen has reached constant weight.7.5 Where necessary, even the surface of the specimen attwo areas 150 mm (6 in.) square at opposite
21、 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 area of a test specimen with an irregular surface bymore than 1.3 mm (0.05 in.).7.6 Make
22、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 to the face of the testspecimen, with the bearing block on top of the specimen. Theinitia
23、l 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) has been applied to thespecimen.8.2 The speed of the moving head of the testing machine
24、shall 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 Compressive strength in kilopascals (or pounds-forceper square inch), including weight of spher
25、ical 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 per cubic foot) of theSFRM.10. Precision and Bias10.1 PrecisionThe precision of the tes
26、t 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. Keywords11.1 compressive strength; sprayed cementitious; sprayedfibrous; sprayed fire resis
27、tive materials (SFRMs)4Although 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 TestE761 92 (2011)2ASTM International takes no position respecting the validity of any patent rights asserted in
28、 connection 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 re
29、sponsible 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 care
30、ful consideration 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 Internationa
31、l, 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 ASTM website (www.astm.org/COPYRIGHT/).E761 92 (2011)3
