ASTM C1795-2015 Standard Test Methods for High-Temperature Characterization of Gypsum Boards and Panels《石膏薄板和中厚板高温特性的标准试验方法》.pdf
《ASTM C1795-2015 Standard Test Methods for High-Temperature Characterization of Gypsum Boards and Panels《石膏薄板和中厚板高温特性的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM C1795-2015 Standard Test Methods for High-Temperature Characterization of Gypsum Boards and Panels《石膏薄板和中厚板高温特性的标准试验方法》.pdf(9页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: C1795 15Standard Test Methods forHigh-Temperature Characterization of Gypsum Boards andPanels1This standard is issued under the fixed designation C1795; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last
2、revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 These test methods describe three bench top test meth-ods for measuring the thermophysical responses of gypsumboards and pa
3、nels when exposed to high temperatures. The testmethods are:1.1.1 High-temperature Core CohesionThis test methodevaluates the ability of the test specimen to withstand aspecified mechanical strain while exposed to elevated tempera-ture.1.1.2 High-temperature ShrinkageThis test method evalu-ates dime
4、nsional changes in the test specimen when exposed toelevated temperatures.1.1.3 High-temperature Thermal InsulationThis testmethod evaluates the rate of heat transfer through the thicknessof the test specimen by measuring the length of time requiredto heat the center of the test specimen over a spec
5、ifiedtemperature rise when exposed to prescribed furnace condi-tions.1.2 The test methods appear in the following order:Test Method SectionHigh-temperature Core Cohesion 4High-temperature Shrinkage 5High-temperature Thermal Insulation 61.3 UnitsThe values stated in either inch-pound units orSI units
6、 (given in parenthesis) are to be regarded separately asstandard. The values stated in each system may not be exactequivalents; therefore, each system shall be used independentlyof the other. Combining values from the two systems mayresult in non-conformance with the standard.1.4 While these tests a
7、re useful for evaluating fire propertiesof gypsum boards and panels, they are not suitable forpredicting the Test Methods E119 fire resistance performanceof a specific gypsum protected assembly that has not previ-ously been tested in accordance with Test Methods E119 andcorrelated to these tests.21.
8、5 This standard is used to measure and describe theresponse of materials, products, or assemblies to heat andflame under controlled conditions, but does not by itselfincorporate all factors required for fire hazard or fire riskassessment of the materials, products, or assemblies underactual fire con
9、ditions.1.6 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 regulatory limitations prior to use.2. Refe
10、renced Documents2.1 ASTM Standards:C11 Terminology Relating to Gypsum and Related BuildingMaterials and SystemsE119 Test Methods for Fire Tests of Building Constructionand MaterialsE631 Terminology of Building Constructions2.2 Other Standards:EN 520 Gypsum PlasterboardsDefinitions, Requirementsand T
11、est Methods3. Terminology3.1 GeneralRefer to Terminologies C11 and E631 forstandard terminology on gypsum and related buildingmaterials, systems and building construction.3.2 Definitions of Terms Specific to This Standard:3.2.1 Thermal Insulation Index (TI), na single value indexthat denotes the rat
12、e of heating at the center of the ThermalInsulation Test specimen as determined by the elapsed time tothe nearest minute for the temperature to rise from 104 to392F (40 to 200C).1This test method is under the jurisdiction ofASTM Committee C11 on Gypsumand Related Building Materials and Systems and i
13、s the direct responsibility ofSubcommittee C11.01 on Specifications and Test Methods for Gypsum Products.Current edition approved Dec. 1, 2015. Published January 2016. DOI: 10.1520/C1795-152Shipp, P. H., and Yu, Q., “Thermophysical Characterization of Type X SpecialFire Resistant Gypsum Board,” Proc
14、eedings of the Fire and Materials 2011Conference, San Francisco, Jan. 1, 2011 Feb. 2, 2011, Interscience Communica-tions Ltd., London, UK, pp 417-426.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14. High-temperature Core Cohesion4.1
15、 Summary of Test MethodThe high-temperature corecohesion of gypsum panel products is evaluated by applying ashear force and bending moment to a cantilevered test speci-men by hanging a weight from the free end of the specimen.The specimen is exposed to heating from two burner flames ata specified di
16、stance and location from its fixed end. Theexposure of the specimen to the burner flame results in thecalcination of the specimen, which weakens the core matrixand results in deflection of the loaded, cantilevered specimen.When a specified deflection occurs, the specimen is examinedfor breakage. Thi
17、s test is derived from an earlier version of thehigh-temperature core cohesion test found in EN 520.4.2 Significance and UseThis test method provides aprocedure for evaluating the high temperature strain capacityof gypsum panel products.4.3 Apparatus:4.3.1 Specimen Mounting DeviceA fixture capable o
18、frigidly supporting the specimen and weight in the horizontalplane. The specimen is clamped or otherwise held rigidly atone end in a cantilevered horizontal position. The mountingfixture shall provide sufficient clearance of the end weightfixture above the horizontal base to allow for the full presc
19、ribeddeflection of the specimen. (Figs. 1 and 2).4.3.2 Hanger StrapA bracket for suspending a weightfrom the free end of the test specimen consisting of anL-shaped metal strap constructed of 20 gauge sheet metal orother suitable material. The short leg of the strap is 0.65 60.05 in. (16 6 1 mm) in l
20、ength. The long leg of the strap hasa mounting hole drilled in it near the outer extremity and is ofsufficient length that the hook or wire by which the loadingweight is suspended from the strap does not contact thespecimen.4.3.3 Loading WeightA weight fitted with a hook or wirefor hanging it from t
21、he free end of the specimen by means ofthe hanger strap. The loading weight may be configured as acup or disk to receive weighted shot or slotted disks to adjustthe weight for different test specimen thicknesses. The totalweight of the entire loading device (hanger strap, loadingweight, suspension w
22、ire or hook) shall correspond to thenominal thickness of the sample in accordance with Eq 1,rounded to the nearest integer multiple of 25, and shown inTable 1:4.3.4 PlatformAn adjustable height platform to limit thedeflection of the specimen to the specified distance of 0.4 60.05 in. (10 6 1 mm) (Se
23、e Fig. 1.)4.3.5 Heating System:4.3.5.1 Two propane Meker burners having a nozzle diam-eter of 1.14 6 0.04 in. (29 6 1.0 mm) and a gas orifice of 0.036 0.01 in. (0.76 6 0.25 mm) are mounted horizontally withtheir nozzles facing each other (Figs. 2 and 3).4.3.5.2 The axes of the burners are aligned to
24、 within 0.05 in.(1 mm).4.3.5.3 Needle valves at the base of each burner provide forfine adjustment of the gas flow rate to control flame shape andtemperature.FIG. 1 Side View of Core Cohesion Test ApparatusW 5 10.6St0.50D(1)Where:W = Total weight of loading device, oz., andt = Nominal board thicknes
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