1、Designation:C12715Standard Test Method forRelative Density(Specific Gravity)and Absorption of CoarseAggregate1This standard is issued under the fixed designation C127;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last r
2、evision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method covers the determination of
3、 relativedensity(specific gravity)and the absorption of coarse aggre-gates.The relative density(specific gravity),a dimensionlessquantity,is expressed as oven-dry(OD),saturated-surface-dry(SSD),or as apparent relative density(apparent specificgravity).The OD relative density is determined after dryi
4、ng theaggregate.The SSD relative density and absorption are deter-mined after soaking the aggregate in water for a prescribedduration.1.2 This test method is not intended to be used withlightweight aggregates that comply with Specification C332Group I aggregates.1.3 The values stated in SI units are
5、 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 me
6、thod.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
7、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 Relative Density(Specific Gravity)and Absorption of Fine AggregateC136 Test Method for Sieve Analysis of Fine and
8、CoarseAggregatesC330 Specification for Lightweight Aggregates for Struc-tural ConcreteC332 Specification for Lightweight Aggregates for Insulat-ing ConcreteC566 Test Method for Total Evaporable Moisture Content ofAggregate by DryingC670 Practice for Preparing Precision and Bias Statementsfor Test Me
9、thods for Construction MaterialsC702 Practice for Reducing Samples ofAggregate to TestingSizeD75 Practice for Sampling AggregatesD448 Classification for Sizes of Aggregate for Road andBridge ConstructionE11 Specification for Woven Wire Test Sieve Cloth and TestSieves2.2 AASHTO Standard:AASHTO T 85 S
10、pecific Gravity and Absorption of CoarseAggregate33.Terminology3.1 For definition of terms used in this standard,refer toTerminology 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 dried
11、 from the surface of the particles,and the massdetermined.Subsequently,the volume of the sample is deter-mined by the displacement of water method.Finally,thesample is oven-dried and the mass determined.Using the mass1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Co
12、ncrete 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 C12712.DOI:10.1520/C0127-15.2For referenced ASTM standards,visit the ASTM
13、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,S
14、uite 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 values thus obtained and formulas in this test method,it ispossible to calculate relative density(specific gravity)andabsorption.5.S
15、ignificance 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 particl
16、es 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 of aggregates.5.2 Relative density is used to calculate the volume occu-pied by the aggregate in various mixtures containing aggregate,including hydraulic cement concrete,bituminous concrete,andother mixtures that are proportioned or analyzed on an absolutevolume basis.Relative densi
