ASTM E761-92(R2020) pdf free download
ASTM E761-92(R2020) pdf free download.Standard Test Method for Compressive Strength of Sprayed Fire-Resistive Material Applied to Structural Members
1. Scope
1.1 This test method covers a procedure for measuring the compressive strength ofsprayed fire-resistive material (SFRM) applied to a rigid substrate. These fire-resistive materials include sprayed fibrous and cementitious materials applied directly in contact with these structural members. The test method is applicable to laboratory procedure. 1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use. 1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards: 2 D2092 Guide for Preparation of Zinc-Coated (Galvanized) Steel Surfaces for Painting (Withdrawn 2008) 3 E84 Test Method for Surface Burning Characteristics of Building Materials E119 Test Methods for Fire Tests of Building Construction and Materials E605/E605M Test Methods for Thickness and Density of Sprayed Fire-Resistive Material (SFRM) Applied to Structural Members
3. Summary of Test Method
3.1 The compressive strength of SFRM applied to a steel sheet is determined by applying a crushing load normal to the surface of the specimen. This test method measures the stress at 10 % deformation or at failure, whichever is smaller.
4. Significance and Use
4.1 The intent of this test method is to determine properties of direct-applied SFRM that may be used to provide an indication of serviceability. Satisfactory performance of fire- resistive material applied to structural members and assemblies depends upon its ability while in place to withstand the various influences that may occur during the life of the structure, as well as upon its satisfactory performance under fire tests. 4.2 This test method measures the compressive strength of SFRM and is a measure of the resistance to deformation under a compressive load. It is an indication of the ability of SFRM to remain in place and resist removal during anticipated service conditions.
5. Apparatus
5.1 Testing Machine—Any form of standard hydraulic or mechanical 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 plane bearing surface of 150 mm [6 in.] square. The upper bearing shall be a spherically seated, hardened metal block firmly attached at the center of the upper head of the machine. The center of the sphere shall lie at the center of the surface held in its spherical seat, but shall be free to turn in any direction, and its perimeter shall have at least 6 mm [ 1 ⁄ 4 in.] clearance from the head to allow for specimens whose bearing surfaces are not exactly parallel (see Fig. 1).5.3 Drying Oven, capable of maintaining temperature and humidity conditions during the specimen curing cycle, in accordance with the SFRM manufacturers’ published require- ments.
6. Materials and Manufacture
6.1 This test method requires the application of SFRM in accordance with manufacturers’ published instructions. The apparatus, materials, and procedures used to apply the SFRM for this test shall be representative of application in the field. 6.2 The density of the prepared sample shall be similar to the density tested and reported during the Test Methods E119 and Test Method E84 fire exposure tests or as required by the sponsor of the test. 6.3 Determine the density and thickness of each of the laboratory-prepared specimens. Report in accordance with Test Methods E605/E605M.
