ASTM_D_7172_-_14.pdf

Designation:D717214Standard Test Method forDetermining the Relative Density(Specific Gravity)andAbsorption of Fine Aggregates Using Infrared1This standard is issued under the fixed designation D7172;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 the relativedensity(specific gravity)and absorption of fine aggregates.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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.2.Referenced Documents2.1 ASTM Standards:2C29/C29M Test Method for Bulk Density(“Unit Weight”)and Voids in AggregateC125 Terminology Relating to Concrete and Concrete Ag-gregatesC128 Test Method for Density,Relative Density(SpecificGravity),and Absorption of Fine AggregateC566 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)D8 Terminology Relating to Materials for Roads and Pave-mentsD75 Practice for Sampling AggregatesD4753 Guide for Evaluating,Selecting,and Specifying Bal-ances and Standard Masses for Use in Soil,Rock,andConstruction Materials Testing2.2 AASHTO Standards:3T-84 Test Method for Specific Gravity and Absorption ofFine Aggregate2.3 Other Documents:4Operational Instructions3.Terminology3.1 DefinitionsAs defined in C125 and D8:3.1.1 Automatic Volumetric Mixer(AVM),nan automatedunit to hold and agitate a volumetric flask while applying avacuum to the flask.4.Significance and Use4.1 Bulk relative density(specific gravity)is the character-istic generally used for calculation of the volume occupied bythe aggregate in various mixtures containing aggregate includ-ing Portland cement concrete,bituminous concrete,and othermixtures that are proportioned or analyzed on an absolutevolume basis.Bulk relative density(specific gravity)is used inthe computation of voids in aggregate in C1252 and C29/C29M.Bulk relative density(specific gravity)determined onthe saturated surface dry(SSD)basis is used if the aggregate iswet,that is,if its absorption has been satisfied.Conversely,thebulk relative density(specific gravity)determined on the oven-dry basis is used for computations when the aggregate is dry orassumed to be dry.4.2 Apparent relative density(specific gravity)pertains tothe relative density of the solid material making up theconstituent particles not including the pore space within theparticles that is accessible to water.This value is not widelyused in construction aggregate technology.4.3 Water absorption values are used to calculate the changein the mass of an aggregate due to water absorbed in the pore1This 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 June 1,2014.Published September 2014.Originallyapproved in 2006.Last previous edition approved in 2006 as D7172 061.DOI:10.1520/D7172-14.2For 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.3Available from American Association of State Highway and TransportationOfficials(AASHTO),444 N.Capitol St.,NW,Suite 249,Washington,DC 20001.4Available from ThermoFisher Scientific,2555 Kerper Boulevard,P.O.Box 797,Dubuque,Iowa 52004-0797,U.S.A.,or online at http:/cp- ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 spaces within the constituent particles,compared to the drycondition,when it is deemed that the aggregate has been incontact with water long enough to satisfy most of the absorp-tion potential.The laboratory standard for absorption is thatobtained after submerging dry aggregate for approximately 24hours in water.Aggregates mined from below the water tablemay have a higher absorption when used,if not allowed to dry.Conversely,some aggregates when used may contain anamount of absorbed moisture less than the 24 hours soakedcondition:For an aggregate that has been in contact with waterand that had free moisture on the particle surface,the percent-age of free moisture can be determined b