1、Designation:D6857/D6857M18Standard Test Method forMaximum Specific Gravity and Density of Asphalt MixturesUsing Automatic Vacuum Sealing Method1This standard is issued under the fixed designation D6857/D6857M;the number immediately following the designation indicates theyear of original adoption or,
2、in the case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of maximumspecific gravity and density of unc
3、ompacted asphalt mixtures at25 C 77 F.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,eachsystem shall be used independently of the other.Combiningvalues from the two systems
4、may result in nonconformancewith the standard.1.3 The text of this standard references notes and footnoteswhich provide explanatory material.These notes and footnotes(excluding those in tables and figures)shall not be consideredas requirements of the standard.1.4 This standard does not purport to ad
5、dress all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was develope
6、d in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.
7、1 ASTM Standards:2C670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsD979/D979M Practice for Sampling Bituminous PavingMixturesD2041/D2041M Test Method for Theoretical MaximumSpecific Gravity and Density of Bituminous Paving Mix-turesD3666 Specificati
8、on 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 TestingE691 Practice for Conducting an Interlaboratory Study toDetermine the Prec
9、ision of a Test MethodE1547 Terminology Relating to Industrial and SpecialtyChemicals3.Terminology3.1 The terms specific gravity and density used in thistest method are in accordance with the Terminology E1547.3.2 Definitions:3.2.1 densityas determined by this test method,the massof a cubic meter of
10、 the material at 25 C in SI units,or the massof a cubic foot of the material at 77 F in inch-pound units.3.2.2 residual pressureas employed by this test method,the pressure in a vacuum chamber when vacuum is applied.3.2.3 specific gravityas determined by this test method,the ratio of a given mass of
11、 material at 25 C 77 F to themass of an equal volume of water at the same temperature.4.Summary of Test Method4.1 A weighed sample of oven-dried asphalt mixture in theloose condition at room temperature is placed inside a speciallydesigned channel bag.The bag containing the sample is placedinside an
12、other bag and placed inside a vacuum chamber.Air isevacuated from the sample to an absolute pressure of 6.0 mmHg 6 Torr and is automatically sealed.The bags containingthe sample are removed from the vacuum chamber and placedinside a large water tank equipped with scales for weighing thesample underw
13、ater.While completely submerged,the bag iscut open by scissors to allow the water to enter the bag.Sincethe sample is under complete vacuum,water will be forcedaround all the accessible areas of the sample.The difference inweight in air and suspended weight in water will provide thesample volume aft
14、er correcting for the bag influence.The dryweight and the volume can be used to calculate the maximum1This test method is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.21 onSpecific Gravity and Density of Asphalt Mixture
15、s.Current edition approved Aug.15,2018.Published August 2018.Originallyapproved in 2003.Last previous edition approved in 2017 as D6857/D6857M 17.DOI:10.1520/D6857_D6857M-18.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annu
16、al 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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Ba