ASTM_C_128_-_15.pdf

Designation:C12815Standard Test Method forRelative Density(Specific Gravity)and Absorption of FineAggregate1This standard is issued under the fixed designation C128;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 covers the determination of relativedensity(specific gravity)and the absorption of fine aggregates.The relative density(specific gravity),a dimensionless quality,is expressed as oven-dry(OD),saturated-surface-dry(SSD),oras apparent relative density(specific gravity).The OD relativedensity is determined after drying the aggregate.The SSDrelative density and absorption are determined after soaking theaggregate in water for a prescribed duration.1.2 This test method is not intended to be used for light-weight aggregates that comply with Specification C332 GroupI aggregates.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 The text of this test method references notes andfootnotes that provide explanatory material.These notes andfootnotes(excluding those in tables and figures)shall not beconsidered as requirements of this test method.1.5 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C29/C29M Test Method for Bulk Density(“Unit Weight”)and Voids in AggregateC70 Test Method for Surface Moisture in Fine AggregateC117 Test Method for Materials Finer than 75-m(No.200)Sieve in Mineral Aggregates by WashingC125 Terminology Relating to Concrete and Concrete Ag-gregatesC127 Test Method for Relative Density(Specific Gravity)and Absorption of Coarse AggregateC330 Specification for Lightweight Aggregates for Struc-tural ConcreteC332 Specification for Lightweight Aggregates for Insulat-ing ConcreteC188 Test Method for Density of Hydraulic CementC566 Test Method for Total Evaporable Moisture Content ofAggregate by DryingC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsC702 Practice for Reducing Samples ofAggregate to TestingSizeC1252 Test Methods for Uncompacted Void Content of FineAggregate(as Influenced by Particle Shape,SurfaceTexture,and Grading)(Withdrawn 2015)3D75 Practice for Sampling AggregatesD854 Test Methods for Specific Gravity of Soil Solids byWater Pycnometer2.2 AASHTO Standard:AASHTO T 84 Specific Gravity and Absorption of FineAggregates43.Terminology3.1 DefinitionsFor definitions of terms used in thisstandard,refer to Terminology C125.4.Summary of Test Method4.1 A sample of aggregate is immersed in water for 24 6 4h to essentially fill the pores.It is then removed from the water,the water is dried from the surface of the particles,and themass determined.Subsequently,the sample(or a portion of it)is placed in a graduated container and the volume of the sampleis determined by the gravimetric or volumetric method.Finally,1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregatesand is the direct responsibility of SubcommitteeC09.20 on Normal Weight Aggregates.Current edition approved Jan.1,2015.Published March 2015.Originallyapproved in 1936.Last previous edition approved in 2012 as C12812.DOI:10.1520/C0128-15.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from American Association of State Highway and TransportationOfficials(AASHTO),444 N.Capitol St.,NW,Suite 249,Washington,DC 20001,http:/www.transportation.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 the sample is oven-dried and the mass determined again.Usingthe mass values thus obtained and formulas in this test method,it is possible to calculate relative density(specific gravity)andabsorption.5.Significance and Use5.1 Relative density(specific gravity)is the ratio of mass ofan aggregate to the mass of a volume of water equal to thevolume of the aggregate particles also referred to as theabsolute volume of the aggregate.It is also expressed as theratio of the density of the aggregate particles to the density ofwater.Distinction is made between the density of aggregateparticles and the bulk density of aggregates as determined byTest Method C29/C29M,which includes the volume of voidsbetween the particles