1、Designation:D375298(Reapproved 2019)Standard Test Method forStrength Imparted by Asbestos to a Cementitious Matrix1This standard is issued under the fixed designation D3752;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of
2、last 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 This test method covers the measurement,on a labora-tory scale,of the contribution of asbestos fibers to the strengthof asb
3、estos-cement products.The results obtained are used inthe primary assessment of different fiber grades prior to theirapplication on a larger scale.1.2 This test method covers the determination of the modu-lus of rupture(MR),adjusted to a dry density of 1.60 Mg/m3(MRA),of asbestos-cement test specime
4、ns that contain theasbestos fiber to be evaluated at a concentration of 10 mass%,whereby the degree of fiberization of that fiber is specified interms of specific surface area as determined by Test MethodD2752.The relative reinforcing value of the fiber under test isestablished by comparison with MR
5、Avalues obtained with afiber of known characteristics at a fiber concentration of 10%and a dry density of 1.60 Mg/m3(1.60 g/cm3).NOTE1The adjusted modulus of rupture(MRA)at any intermediatefiber concentration may be interpolated from results suitably determinedover a limited spanning range of fiber
6、concentrations.For example,theMRAat 10%fiber concentration may be graphically determined from dataat 3 and 17%.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 WarningBreathing of asbestos dust is hazardous.Asbestos and as
7、bestos 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 safe use of chrysotile asbestos,refer to“Safe Use ofChrysotile:
8、A Manual on Preventive and Control Measures.”21.5 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,health,and environmental practices and deter-mine the applicabili
9、ty of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the Worl
10、d Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced 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 Cemen
11、t byAir-Permeability ApparatusD1193 Specification for Reagent WaterD2589 Test Method for McNett Wet Classification of DualAsbestos FiberD2590 Test Method for Sampling Chrysotile AsbestosD2752 Test Methods forAir Permeability ofAsbestos FibersD2946 Terminology for Asbestos and AsbestosCementProductsD
12、3879 Test Method for Sampling Amphibole Asbestos(Withdrawn 2009)4E177 Practice for Use of the Terms Precision and Bias inASTM Test Methods2.2 Other Standard:5Quebec Asbestos Mining Association(QAMA)StandardDesignation for Chrysotile Asbestos Grades3.Terminology3.1 DefinitionsFor definitions of asbes
13、tos terms used inthis test method,refer to Terminology D2946.1This test method is under the jurisdiction of ASTM Committee C17 onFiber-Reinforced Cement Products and is the direct responsibility of SubcommitteeC17.03 on Asbestos-Cement Sheet Products and Accessories.Current edition approved April 15
14、,2019.Published May 2019.Originallyapproved in 1979.Last previous edition approved in 2011 as D3752 98(2011).DOI:10.1520/D3752-98R19.2Available from The Asbestos Institute,http:/ referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annu
15、al 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.5Available from the Asbestos Institute,1002 Sherbrooke St.W,Suite 1750,Montreal,QC,Canada H3A 3L6.Copyright
16、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 4.Summary of Test Method4.1 This test method covers the preparation and flexuraltestin
