1、Designation:C127-15NTERNATIONALStandard 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 y
2、ear of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)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.ScopeC125 Terminology Relating to Concr
3、ete and Concrete Ag-1.1 This test method covers the determination of relativegregatesdensity(specific gravity)and the absorption of coarse aggre-C128 Test Method for Relative Density(Specific Gravity)gates.The relative density(specific gravity),a dimensionlessand Absorption of Fine Aggregatequantity
4、,is expressed as oven-dry(OD),saturated-surface-dryC136 Test Method for Sieve Analysis of Fine and Coarse(SSD),or as apparent relative density(apparent specificAggregatesgravity).The OD relative density is determined after drying theC330 Specification for Lightweight Aggregates for Struc-aggregate.T
5、he SSD relative density and absorption are deter-tural Concretemined after soaking the aggregate in water for a prescribedC332 Specification for Lightweight Aggregates for Insulat-duration.ing ConcreteC566 Test Method for Total Evaporable Moisture Content of1.2 This test method is not intended to be
6、 used withAggregate by Dryinglightweight aggregates that comply with Specification C332C670 Practice for Preparing Precision and Bias StatementsGroup I aggregates.for Test Methods for Construction Materials1.3 The values stated in SI units are to be regarded asC702 Practice for Reducing Samples of A
7、ggregate to Testingstandard.No other units of measurement are included in thisSizestandard.D75 Practice for Sampling Aggregates1.4 The text of this test method references notes andD448 Classification for Sizes of Aggregate for Road andfootnotes that provide explanatory material.These notes andBridge
8、 Constructionfootnotes(excluding those in tables and figures)shall not beEll Specification for Woven Wire Test Sieve Cloth and Testconsidered as requirements of this test method.Sieves1.5 This standard does not purport to address all of the2.2 AASHTO Standard:safety concerns,if any,associated with i
9、ts use.It is theAASHTO T 85 Specific Gravity and Absorption of Coarseresponsibility of the user of this standard to establish appro-Aggregatepriate safety and health practices and determine the applica-biliry of regulatory limitations prior to use.3.Terminology3.1 For definition of terms used in thi
10、s standard,refer to2.Referenced DocumentsTerminology C125.2.1 ASTM Standards:2C29/C29M Test Method for Bulk Density(Unit Weight)4.Summary of Test Methodand Voids in Aggregate4.1 A sample of aggregate is immersed in water for 24+4h to essentially fill the pores.It is then removed from the water,the w
11、ater dried from the surface of the particles,and the massThis test method is under the jurisdiction of ASTM Committee C09 ondetermined.Subsequently,the volume of the sample is deter-Concrete and Concrete Aggregatesand is the direct responsibility of SubcommitteeC09.20 on Normal Weight Aggregates.min
12、ed by the displacement of water method.Finally,theCurrent edition approved Jan.1,2015.Published March 2015.Originallysample is oven-dried and the mass determined.Using the massapproved in 1936.Last previous edition approved in 2012 as C127-12.DOI:10.1520/C0127-152 For referenced ASTM standards,visit
13、 the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTM3 Available from American Association of State Highway and TransportationStandards volume information,refer to the standards Document Summary page onOfficials(AASHTO),444 N.Capitol St.,NW.Suite 2
14、49,Washington,DC 20001.the ASTM website.http:/www.transportation.org.Copyright ASTM Intemational,100 Barr Harbor Drive,PO Box C700.West Conshohocken.PA 19428-2959.United StatesC127-15where:TABLE 1 PrecisionAaverage absorption,%,Acceptable Range ofA.A2.A=absorption percentages for each sizeStandard D
15、eviation Two Results(d2s)fraction,andSingle-Operator Precision:Relative density(specific gravity)0.0090.025P.P2.P=mass percentages of each size fraction pres-(OD)ent in the original sample.Relative density(specific gravity)0.0070.020(SSD)10.ReportApparent relative density(specific0.0070.020gravity)1
16、0.1 Report relative density(specific gravity)results to thenearest 0.01 and indicate the basis for relative density(specificMultilaboratory Precision:Relative density(specific gravity)0.0130.038gravity)as either(OD),(SSD),or apparent.(OD)Relative density(specific gravity)0.0110.03210.2 Report the ab
17、sorption result to the nearest 0.1%(SSD)10.3 If the relative density(specific gravity)and absorptionApparent relative density(specific0.0110.032gravity)）values were determined without first drying the aggregate,aspermitted in 8.2,note that fact in the report.A These numbers represent the(d2s)limits
18、as described in Practice C670.Theprecision estimates were obtained from the analysis of combined AASHTOMaterials Reference Laboratory proficiency sample data from laboratories using11.Precision and Bias15 h minimum saturation times and other laboratories using 24+4 h saturationtimes.Testing was perf
19、ormed on normal-weight aggregates,and started with11.1 The estimates of precision of this test method listed inaggregates in the oven-dry condition.Table 1 are based on results from the AASHTO MaterialsReference Laboratory Proficiency Sample Program,with test-ing conducted by this test method and AA
20、SHTO Method T 85.The significant difference between the methods is that Test11.2 Bias-Since there is no accepted reference material forMethod C127 requires a saturation period of 24 4 h,whiledetermining the bias for the procedure in this test method,noAASHTO Method T 85 requires a saturation period
21、of 15 hstatement on bias is being made.minimum.This difference has been found to have an insignifi-cant effect on the precision indices.The data are based on the12.Keywordsanalyses of more than 100 paired test results from 40 to 10012.1 absorption;aggregate;apparent relative density;coarselaboratori
22、es.aggregate;relative density;specific gravityAPPENDIXES(Nonmandatory Information)X1.DEVELOPMENT OF EQUATIONSX1.1 The derivation of the equation is from the following1simplified cases using two solids.Solid 1 has a mass M inG=MV(X1.3)M2Vgrams and a volume V in millilitres;its relative densityM,+M,M,
23、+M,+M,(specific gravity)(G)is therefore M/V.Solid 2 has a mass MHowever,the mass fractions of the two solids are:2 and volume V2,and G2=M2/V2.If the two solids areconsidered together,the relative density(specific gravity)ofM,/M,+M,=P,/100andM,/八M,+M2=P,/100(X1.4)the combination is the total mass in grams divided by the totaland,volume in millilitres:1/G V/M,and 1/G2 V2/M 2(X1.5)G=(M,+M)(V,+V2)(X1.1)Therefore,Manipulation of this equation yields the following:1G=P,1P21(X1.6)G=V,+y2=y,V2(X1.2)100G,+100GM,+M,M,+M,M,+M.An example of the computation is given in Table X1.1.