1、Designation:D6857/D6857M11Standard Test Method forMaximum Specific Gravity and Density of BituminousPaving Mixtures Using Automatic Vacuum Sealing Method1This standard is issued under the fixed designation D6857/D6857M;the number immediately following the designation indicates theyear of original ad
2、option or,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 of and d
3、ensity of uncompacted bituminouspaving mixtures at 25C 77F.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 equivalent;therefore,eachsystem shall be used independently of the other.Combiningvalues f
4、rom the two systems may result in non-conformancewith the standard.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 appli
5、ca-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsD979 Practice for Sampling Bituminous Paving MixturesD2041 Test Method for Theoretical Maximum SpecificGravit
6、y and Density of Bituminous Paving MixturesD4753 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 Precision of a Test MethodE1547 Terminology Relatin
7、g to Industrial and SpecialtyChemicalsD3666 Specification for Minimum Requirements for Agen-cies Testing and Inspecting Road and Paving Materials3.Terminology3.1 The terms specific gravity and density used in this testmethod are in accordance with the Terminology E1547.3.2 Definitions:3.2.1 density,
8、as determined by this test methodthe massof a cubic meter of the material at 25C in SI units,or the massof a cubic foot of the material at 77F in inch-pound units.3.2.2 residual pressure,as employed by this test methodthe pressure in a vacuum chamber when vacuum is applied.3.2.3 specific gravity,as
9、determined by this test methodthe ratio of a given mass of material at 25C 77F to the massof an equal volume of water at the same temperature.4.Summary of Test Method4.1 A weighed sample of oven-dry paving mixture in theloose condition at room temperature is placed inside a speciallydesigned channel
10、 bag.The bag containing the sample is placedinside another 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 ta
11、nk equipped with scales for weighing thesample under water.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 suspe
12、nded weight in water will provide thesample volume after correcting for the bag influence.The dryweight and the volume can be used to calculate the maximumspecific gravity of the sample.This method is a rapid techniquefor determination of maximum specific gravity that minimizesthe exposure of bitumi
13、nous samples to water during testing andreduces the chance of water absorption.NOTE1For porous aggregates,if water absorption correction is notperformed on the maximum specific gravities obtained using this testmethod,the results may be higher than the results obtained by TestMethod D2041.Without ag
14、gregate water absorption correction,air voidscalculated based on these results may be higher.5.Significance and Use5.1 The maximum specific gravities and densities of bitu-minous paving mixtures are intrinsic properties whose values1This test method is under the jurisdiction of ASTM Committee D04 on
15、 Roadand Paving Materials and is the direct responsibility of Subcommittee D04.21 onSpecific Gravity and Density of Bituminous Mixtures.Current edition approved June 1,2011.Published July 2011.Originally approvedin 2003.Last previous edition approved in 2009 as D6857 09.DOI:10.1520/D6857_D6857M-11.2
16、For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 are influenced by the composition of the mixture in terms oftypes and amounts of aggregates and bituminous materials.5.1.1 They are used to calculate values
