ASTM_C_115_-_C_115M_-_10e1.pdf

Designation:C115/C115M101Standard Test Method forFineness of Portland Cement by the Turbidimeter1This standard is issued under the fixed designation C115/C115M;the number immediately following the designation indicates the yearof original adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1NOTEDesignation was corrected editorially in October 2013.1.Scope*1.1 This test method covers determination of the fineness ofportland cement as represented by a calculated measure ofspecific surface,expressed as square centimetres of totalsurface area per gram,or square metres of total surface area perkilogram,of cement,using the Wagner turbidimeter.21.2 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.1.3 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 shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.Values in SI units or inch-pound units shallbe obtained by measurement in SI units or inch-pound unitsor by appropriate conversion,using the Rules for Conversionand Rounding given in IEEE/ASTM SI 10 of measurementsmade in other units.Values are stated in SI units wheninch-pound units are not used in practice.2.Referenced Documents2.1 ASTM Standards:3C114 Test Methods for Chemical Analysis of HydraulicCementC430 Test Method for Fineness of Hydraulic Cement by the45-m(No.325)SieveC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsIEEE/ASTM SI 10 American National Standard for Use ofthe International System of Units(SI):The Modern MetricSystem3.Significance and Use3.1 The purpose of this test method is to determine whetheror not the hydraulic cement under test meets the Wagnerturbidimetric fineness requirements of the applicable hydrauliccement specification for which the test is being made.Finenessof the cement component is only one of the many character-istics that influence the strength capabilities of concrete.4.Apparatus4.1 Nature of ApparatusThe Wagner turbidimeter consistsessentially of a source of light maintained at constant intensityand adjusted so that approximately parallel rays of light passthrough a suspension of the cement to be tested and impingeupon the sensitive plate of a photoelectric cell.The currentgenerated in the cell is measured by means of a microammeterand the indicated reading is a measure of the turbidity of thesuspension.General considerations indicate that turbidity is inturn a measure of the surface area of the suspended sample ofcement.The apparatus shall consist specifically of the partsdescribed in 4.2 4.7 and shall be constructed in accordancewith the detailed design and dimensional requirements shownin Fig.1 and Table 1,except that the case may be either ofwood or of metal.4.2 Turbidimeter,mounted in a suitable wood or metal caseincluding the following features:4.2.1 Source of LightThe source of light(Fig.1)shallconsist of a concentrated-filament electric lamp of between 3and 6 cd operated by a source of constant emf.The lamp shallbe mounted rigidly in the socket.A clean,bright parabolicmetallic reflector shall be rigidly mounted behind the lamp,focused so that approximately parallel rays of light will pass1This 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 Feb.1,2010.Published March 2010.Originallyapproved in 1934.Last previous edition approved in 2003 as C11596a(2003).DOI:10.1520/C0115_C0115M-10E01.2The sole source of supply of the apparatus known to the committee at this timeis the Wagner turbidimeter.If you are aware of alternative suppliers,please providethis information to ASTM International Headquarters.Your comments will receivecareful consideration at a meeting of the responsible technical committee,1whichyou may attend.This turbidimeter was developed by L.A.Wagner,ResearchAssociate of the Cement Reference Laboratory,National Institute of Standards andTechnology,Washington,DC.A description of the apparatus and the originalmathematical derivations of formulas used are given in the paper:Wagner,L.A.,“ARapid Method for the Determination of the Specific Surface of Portland Cement,”Proceedings,ASTM,ASTEA,Vol 33,Part II,1933,p.553.3For 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