ASTM_D_6927_-_15.pdf

Designation:D692715Standard Test Method forMarshall Stability and Flow of Asphalt Mixtures1This standard is issued under the fixed designation D6927;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers measurement of resistance toplastic flow of 4 in.(102 mm)cylindrical specimens of asphaltpaving mixture loaded in a direction perpendicular to thecylindrical axis by means of the Marshall apparatus.This testmethod is for use with dense graded asphalt mixtures preparedwith asphalt cement(modified and unmodified),cutbackasphalt,tar,and tar-rubber with maximum size aggregate up to1 in.(25 mm)in size(passing 1 in.(25 mm)sieve).1.2 UnitsThe values stated in inch-pound units are to beregarded as standard.The values given in parentheses aremathematical conversions to SI units that are provided forinformation only and are not considered 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 applica-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 MaterialsD1188 Test Method for Bulk Specific Gravity and Density ofCompacted Bituminous Mixtures Using Coated SamplesD2726 Test Method for Bulk Specific Gravity and Densityof Non-Absorptive Compacted Bituminous MixturesD3549 Test Method for Thickness or Height of CompactedBituminous Paving Mixture SpecimensD3666 Specification for Minimum Requirements for Agen-cies Testing and Inspecting Road and Paving MaterialsD6752 Test Method for Bulk Specific Gravity and Densityof Compacted Bituminous Mixtures Using AutomaticVacuum Sealing MethodD6926 Practice for Preparation of Bituminous SpecimensUsing Marshall ApparatusE2251 Specification for Liquid-in-Glass ASTM Thermom-eters with Low-Hazard Precision Liquids3.Terminology3.1 Definitions:3.1.1 lab mix lab compacted(LMLC)asphalt mixture,nasphalt mix samples that are prepared in the laboratory byweighing and blending each constituent then compacting theblended mixture using a laboratory compaction apparatus.3.1.1.1 DiscussionLMLC typically occurs during the as-phalt mixture design phase.Laboratory compaction devicessuch as the Superpave Gyratory Compactor,Marshall Hammer,or other laboratory compaction devices may be used.3.1.2 plant mix laboratory compacted(PMLC)asphaltmixture,nasphalt mixture samples that are manufactured in aproduction plant,sampled prior to compaction,then immedi-ately compacted using a laboratory compaction apparatus.3.1.2.1 DiscussionPMLC specimens are often used forquality control testing.The asphalt mixture is not permitted tocool substantially and it may be necessary to place the mixturein a laboratory oven to equilibrate the mixture to the compac-tion temperature before molding.Laboratory compaction de-vices such as the Superpave Gyratory Compactor,MarshallHammer,or other laboratory compaction devices may be used.3.1.3 reheated plant mix lab compacted(RPMLC)asphaltmixture,nasphalt mixture samples that are manufactured in aproduction plant,sampled prior to compaction,allowed to coolto room temperature,then reheated in a laboratory oven andcompacted using a laboratory compaction apparatus.3.1.3.1 DiscussionRPMLC are often used for qualityacceptance and verification testing.The reheating time shouldbe as short as possible to obtain uniform temperature to avoidartificially aging the specimens.Asphalt mixture conditioning,reheat temperature,and reheat time should be defined in theapplicable specification.Laboratory compaction devices suchas the Superpave Gyratory Compactor,Marshall Hammer,orother laboratory compaction devices may be used.1This test method is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.20 onMechanical Tests of Asphalt Mixtures.Current edition approved Feb.1,2015.Published April 2015.Originallyapproved in 2004.Last previous edition approved in 2006 as D6927 06.DOI:10.1520/D6927-15.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.Significance and Use4.1 Marshall stability and flow values along with density;air voids in the total mix,voids in the mineral aggregate,orvoids filled with asphalt,or both,filled with asphalt are usedfor laboratory mix design and