1、Designation:D3880/D3880M90(Reapproved 2017)Standard Test Method forAsbestos Strength Units1This standard is issued under the fixed designation D3880/D3880M;the number immediately following the designation indicates theyear of original adoption or,in the case of revision,the year of last revision.A n
2、umber in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method gives a procedure for the evaluation ofthe strength-giving properties of asbestos fibers used to rein-force asbestos-cement
3、 products.1.2 The purpose of this test method is to determine thenumber of strength units that may be assigned to the sampletested.1.3 Asbestos fiber possesses the ability to impart strength toan asbestos-cement product.Every fiber grade may be regardedas possessing a certain quantity of strength-gi
4、ving units.Thequantity of fiber required in an asbestos-cement compositionvaries inversely with the number of strength units it possesses.For example,if an amount,designated by X,of a fiberpossessing 100 strength units produces a product of a givenstrength,2X would be required to produce a product o
5、fequivalent strength from fiber possessing only 50 strengthunits.1.4 The following definition is the basis for the strength unittest:An asbestos fiber that gives the standard strength at thestandard density when used as 10%of the furnish is defined ashaving 100 strength units.Therefore,by knowing th
6、e percentfiber required in the mix to give standard strength at thestandard density,it is possible to calculate the strength units ofa sample of asbestos.1.5 This procedure is intended primarily for chrysotileasbestos;it has not been verified whether or not it is applicableto other types.1.6 The val
7、ues stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.
8、7 WarningBreathing of asbestos dust is hazardous.Asbestos and asbestos products present demonstrated healthrisks for users and for those with whom they come into contact.In addition to other precautions,when working with asbestos-cement products,minimize the dust that results.For informa-tion on the
9、 safe use of chrysoltile asbestos,refer to“Safe Useof Chrysotile Asbestos:A Manual on Preventive and ControlMeasures.”21.8 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
10、 safety and health practices and determine the applica-bility of regulatory limitations prior to use.For specificprecautionary statements see 6.7.2,7.5,9.2.2,and 1.7.1.9 This international standard was developed in accor-dance with internationally recognized principles on standard-ization establishe
11、d in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:3C150 Specification for Portland CementC184 Test Method for Fineness of H
12、ydraulic Cement by the150-m(No.100)and 75-m(No.200)Sieves(With-drawn 2002)4C204 Test Methods for Fineness of Hydraulic Cement byAir-Permeability ApparatusC430 Test Method for Fineness of Hydraulic Cement by the45-m(No.325)SieveC1120 Test Method for Wash Test of AsbestosC1121 Test Method for Turner a
13、nd Newall(T and N)Wet-Length Classification of AsbestosC1162 Test Method for Loose Density of AsbestosD1193 Specification for Reagent WaterD1655 Specification for Aviation Turbine FuelsD2590 Test Method for Sampling Chrysotile Asbestos1This test method is under the jurisdiction of ASTM Committee C17
14、 onFiber-Reinforced Cement Products and is the direct responsibility of C17.03 onAsbestos-Cement Sheet Products and Accessories.Current edition approved June 1,2017.Published July 2017.Originally approvedin 1980.Last previous edition approved in 2009 as D3880/D3880M 90(2009)1.DOI:10.1520/D3880_D3880
15、M-90R17.2Available from The Asbestos Institute,http:/ referenced ASTM standards,visit the ASTM website,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.4The last approve
16、d version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 D2946 Ter
