1、Designation:C20416American Association StateHighway and Transportation Officials StandardAASHTO No.:T 153Standard Test Methods forFineness of Hydraulic Cement by Air-PermeabilityApparatus1This standard is issued under the fixed designation C204;the number immediately following the designation indica
2、tes the year oforiginal adoption or,in the case of revision,the year of 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.Scope*1.1 This test method covers determination of the finen
3、ess ofhydraulic cement,using the Blaine air-permeability apparatus,in terms of the specific surface expressed as total surface areain square centimetres per gram,or square metres per kilogram,of cement.Two test methods are given:Test Method A is theReference Test Method using the manually operated s
4、tandardBlaine apparatus,while Test Method B permits the use ofautomated apparatus that has in accordance with the qualifica-tion requirements of this test method demonstrated acceptableperformance.Although the test method may be,and has been,used for the determination of the measures of fineness ofv
5、arious other materials,it should be understood that,ingeneral,relative rather than absolute fineness values areobtained.1.1.1 This test method is known to work well for portlandcements.However,the user should exercise judgement indetermining its suitability with regard to fineness measure-ments of c
6、ements with densities,or porosities that differ fromthose assigned to Standard Reference Material No.114.1.2 The values stated in SI units are to be regarded as thestandard.1.3 WarningMercury has been designated by many regu-latory agencies as a hazardous substance that can causeserious medical issu
7、es.Mercury,or its vapor,has beendemonstrated to be hazardous to health and corrosive tomaterials.Caution should be taken when handling mercuryand mercury containing products.See the applicable productSafety Data Sheet(SDS)for additional information.Usersshould be aware that selling mercury and/or me
8、rcury contain-ing products into your state or country may be prohibited bylaw.1.4 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 determin
9、e the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2A582/A582M Specification for Free-Machining StainlessSteel BarsC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsE832 Specification for Laboratory F
10、ilter Papers2.2 Other Document:No.114National Institute of Standards and TechnologyStandard Reference Material3BS 4359:1971 British Standard Method for the Determina-tion of Specific Surface of Powders:Part 2:Air Perme-ability Methods4TEST METHOD A:REFERENCE METHOD3.Apparatus3.1 Nature of ApparatusT
11、he Blaine air-permeability ap-paratus consists essentially of a means of drawing a definitequantity of air through a prepared bed of cement of definiteporosity.The number and size of the pores in a prepared bed ofdefinite porosity is a function of the size of the particles anddetermines the rate of
12、airflow through the bed.The apparatus,illustrated in Fig.1,shall consist specifically of the partsdescribed in 3.2 3.8.3.2 Permeability CellThe permeability cell shall consistof a rigid cylinder 12.70 6 0.10 mm in inside diameter,constructed of austenitic stainless steel.The interior of the cellshal
13、l have a finish of 0.81 m(32 in.).The top of the cell shallbe at right angles to the principal axis of the cell.The lower1This test method is under the jurisdiction of ASTM Committee C01 on Cementand is the direct responsibility of Subcommittee C01.25 on Fineness.Current edition approved March 1,201
14、6.Published March 2016.Originallyapproved in 1946.Last previous edition approved in 2011 as C204 111.DOI:10.1520/C0204-16.2For 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
15、 the standards Document Summary page onthe ASTM website.3Available from National Institute of Standards and Technology(NIST),100Bureau Dr.,Stop 1070,Gaithersburg,MD 20899-1070,http:/www.nist.gov.4Available from British Standards Institute(BSI),389 Chiswick High Rd.,London W4 4AL,U.K.,http:/www.bsi-.
16、*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1portion of the cell must be able to form an airtight fit with theupper end of the manometer,so that there is no air leakagebetween the contacting surfaces.A ledge12to 1 mm in widthshall be an integral part of the cell or be firmly fixed in the cell55 6 10 mm from the top of the cell for support of theperforated metal disk.Th
