ASTM_D_6752_-_D_6752M_-_11.pdf

Designation:D6752/D6752M11Standard Test Method forBulk Specific Gravity and Density of Compacted BituminousMixtures Using Automatic Vacuum Sealing Method1This standard is issued under the fixed designation D6752/D6752M;the number immediately following the designation indicates theyear of original adoption 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 bulkspecific gravity of compacted bituminous mixtures by thevacuum sealing method.1.2 This method can be used for compacted cylindrical andcubical bituminous laboratory and field specimens.1.3 The bulk specific gravity of the compacted bituminousmixtures may be used in calculating the unit weight of themixture.1.4 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 from the two systems may result in non-conformancewith the standard.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 requirements prior to use.2.Referenced Documents2.1 ASTM Standards:2C670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsD2726 Test Method for Bulk Specific Gravity and Densityof Non-Absorptive Compacted Bituminous MixturesD3203 Test Method for Percent Air Voids in CompactedDense and Open Bituminous Paving MixturesD3666 Specification 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 TestingD5361 Practice for Sampling Compacted Bituminous Mix-tures for Laboratory TestingD7227 Practice for Rapid Drying of Compacted AsphaltSpecimens Using Vacuum Drying Apparatus2.2 AASHTO Standards:3M323 Standard Specification for Superpave Mix Design3.Significance and Use3.1 The results obtained from this method can be used todetermine the unit weight of compacted bituminous mixturesand in conjunction with Test Method D3203,to obtain percentair voids.These values in turn may be used in determining therelative degree of compaction.3.2 Since specific gravity has no units,it must be convertedto density in order to do calculations that require units.Thisconversion is made by multiplying the specific gravity at agiven temperature by the density of water at the same tempera-ture.3.3 This method can be used for 100 mm 4 in.and 150 mm6 in.diameter cylindrical as well as cubical asphalt speci-mens to correct for inconsistencies in sample weight determi-nations resulting from drainage of water from samples andinaccuracy in saturated surface dry weight of absorptive coarseand open graded mixes.Mixes such as Stone Matrix Asphalt(SMA),porous friction course,and coarse graded mixes withsignificant surface texture and interconnected voids can betested with this method.Follow manufacturer recommendationfor appropriate bag sizes to be utilized with cubical andabnormally shaped samples.41This 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 Bituminous Mixtures.Current edition approved June 1,2011.Published July 2011.Originally approvedin 2002.Last previous edition approved in 2009 as D6752 09.DOI:10.1520/D6752_D6752M-11.2For 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 the American Association of State Highway TransportationOfficials(AASHTO),441 N.Capitol Street,NW,Washington,DC 20001.4Bulk specific gravity determined by this method may be lower than the resultsobtained by Test Method D2726.As a result,air voids determined from these bulkspecific gravity values may be higher than the air voids values determined using TestMethod D2726.These differences may be more pronounced for coarse aggregatemixtures.Users of this method are cautioned to evaluate any alteration in percentasphalt content or aggregate gradations for mix designs with a known positiveperformance history.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 NOTE1The personnel and equipment used in performing this test canbe evaluated in accordance with Practice D3666.4.Apparatus4.1 Balance,with ample capacity,and with sufficient sensi-tivity to enable bulk specific gravity of