1、Designation:D3880/D3880M90(Reapproved 2009)1Standard 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
2、number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1NOTEUnits information was corrected and warning notes in 6.7.2,7.5,and 9.2.2 were moved into the standard text inMarch 2010.1.Scope1.1 This test meth
3、od gives a procedure for the evaluation ofthe strength-giving properties of asbestos fibers used to rein-force asbestos-cement 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
4、 impart strength toan asbestos-cement product.Every fiber grade may be regardedas possessing a certain quantity of strength-giving 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
5、by X,of a fiberpossessing 100 strength units produces a product of a givenstrength,2X would be required to produce a product ofequivalent 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
6、 strength at thestandard density when used as 10%of the furnish is defined ashaving 100 strength units.Therefore,by knowing the 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 i
7、s intended primarily for chrysotileasbestos;it has not been verified whether or not it is applicableto other types.1.6 The values 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 s
8、hall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.7 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 a
9、ddition to other precautions,when working with asbestos-cement products,minimize the dust that results.For informa-tion on the 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 th
10、esafety 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.For specificprecautionary statements see 6.7.2,7.5,9.2.2,and 1.7.2.Refere
11、nced Documents2.1 ASTM Standards:3C150 Specification for Portland CementC184 Test Method for Fineness of Hydraulic 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 Hydraul
12、ic Cement by the45-m(No.325)SieveC1120 Test Method for Wash Test of AsbestosC1121 Test Method for Turner and 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 Tes
13、t Method for Sampling Chrysotile AsbestosD2946 Terminology for Asbestos and AsbestosCementProducts1This test method is under the jurisdiction of ASTM Committee C17 onFiber-Reinforced Cement Productsand is the direct responsibility of C17.03 onAsbestos-Cement Sheet Products and Accessories.Current ed
14、ition approved Nov.1,2009.Published March 2010.Originallyapproved in 1980.Last previous edition approved in 2004 as D3880 90(2004)1.DOI:10.1520/D3880_D3880M-90R09E01.2Available from The Asbestos Institute,http:/ referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Se
15、rvice at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.4The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshoh
16、ocken,PA 19428-2959.United States1 D2589 Test Method for McNett Wet Classification of DualAsbestos FiberD3639 Test Method for Classification of Asbestos by Que-bec Standard TestD3752 Test Method for Strength Imparted by Asbestos to aCementitious MatrixE11 Specification for Woven Wire Test Sieve Cloth and TestSieves2.2 Other Standards:Quebec Asbestos Mining Association(QAMA)Standard,Designation for Chrysotile Asbestos Grades53.Terminology3.1 Definitions:3.1.1 point value,n in asbestos,an index of
