ASTM_D_5148_-_10.pdf

Designation:D514810Standard Test Method forCentrifuge Kerosine Equivalent1This standard is issued under the fixed designation D5148;the number immediately following the designation indicates 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.Scope1.1 This test method determines the centrifuge kerosineequivalent(CKE)of aggregate used in bituminous mixtures.1.2 Units of Measure:1.2.1 The values stated in inch-pound units are to beregarded as standard.The values given in parentheses aremathematical conversions to SI units that are provided forinformation only and are not considered standard.An excep-tion is made in the values used for mass because this standardwas originally developed using even values of grams,and useof ounces as a standard would make those measures cumber-some.1.2.2 Regarding sieves,per ASTM Specification E11 Sec-tion 1.2,“the values stated in SI units shall be consideredstandard for the dimensions of the wire cloth openings and thediameter of the wires used in the wire cloth.The values statedin inchpound units shall be considered standard with regard tothe sieve frames.”When sieve mesh sizes are referenced,thealternate inch-pound designations are provided for informationpurposes and enclosed in parentheses.1.3 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.For specific hazardstatements,see 7.1.2.Referenced Documents2.1 ASTM Standards:2C127 Test Method for Relative Density(Specific Gravity)and Absorption of Coarse AggregateC128 Test Method for Relative Density(Specific Gravity)and Absorption of Fine AggregateC702 Practice for Reducing Samples ofAggregate to TestingSizeD75 Practice for Sampling AggregatesD3666 Specification for Minimum Requirements for Agen-cies Testing and Inspecting Road and Paving MaterialsD4753 Guide for Evaluating,Selecting,and Specifying Bal-ances and Standard Masses for Use in Soil,Rock,andConstruction Materials TestingE11 Specification for Woven Wire Test Sieve Cloth and TestSievesE832 Specification for Laboratory Filter Papers3.Terminology3.1 Symbols:3.1.1 Ccoarse aggregate fraction,that portion of thesample which passes the 9.5 mm(38in.)sieve and is retainedon the 4.75 mm(No.4)sieve.3.1.2 Ffine aggregate fraction,that portion of the samplewhich passes the 4.75 mm(No.4)sieve.3.1.3 SAsurface area.The sum,ft2/lb(m2/kg),obtained byadding the products of the percent passing each sieve and itscorresponding factor,(see 11.1)and dividing by 100.3.1.4 K factorsvalues determined as described in 3.1.5through 3.1.8 and identified as Kc,Kf,or Km.3.1.5 Kcdetermined from the percent of SAE No.10 oilretained,which represents the total effect of the aggregatesabsorptive properties and surface roughness of the aggregatescoarse fraction.NOTE1Based on comparative testing in California,the same resultscan be obtained substituting Shell Tellus No.100 oil for SAE No.10 oil.3.1.6 Kfdetermined from the following factors:3.1.7 Percent of kerosine retained,which represents the totaleffect of superficial area,the aggregates absorptive propertiesand surface roughness of the aggregates fine fraction.3.1.7.1 Computed surface area,based on particle size.3.1.7.2 Percent of aggregate passing 4.75 mm(No.4)sieve.3.1.8 Kmthe“mean”or composite value of K for a givencombination of coarse and fine materials on which Kcand Kfhave already been determined independently.1This test method is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.51 onAggregate Tests.Current edition approved Dec.1,2010.Published March 2011.OriginallypublishedasD5148 90.Lastpreviouseditionpublished2002asD5148 95(2002).DOI:10.1520/D5148-10.2For 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 the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.Significance and Use4.1 The CKE furnishes an index,designated as the K factor,that indicates the aggregate particle roughness and surfacecapacity based on porosity.4.2 The CKE is used as part of the Hveem mix designprocedure to determine the approximate bitumen ratio(ABR),as shown in Appendix X1.However,there are other applica-tions such as determining the coarse aggregate fraction con-stant(Kc)for use as an aid in selecting a bitumen content foropen-graded friction courses.NOTE2The quality of the results produced by this standard aredependant upon the competence of the personn