1、Designation:D239921Standard Practice forSelection of Cutback Asphalts1This standard is issued under the fixed designation D2399;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 indicat
2、es the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers the selection of cutback asphalts ofthe slow,medium,and rapid curing types for various pavingand allied uses.Slow-curing cutback asphalts are also
3、calledroad oils.1.2 The values stated in either SI units or English units areto be regarded separately as standard.The values stated in eachsystem may not be exact equivalents;therefore,each systemshall be used independently of the other.Combining valuesfrom the two systems may result in nonconforma
4、nce with thestandard.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 address all of thesafety co
5、ncerns,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 developed in accor-dance with int
6、ernationally 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 Documents2.1 ASTM Standards:2D2026/D
7、2026M Specification for Cutback Asphalt(Slow-Curing Type)D2027/D2027M SpecificationforCutbackAsphalt(Medium-Curing Type)D2028/D2028M Specification for Cutback Asphalt(Rapid-Curing Type)3.Terminology3.1 Definitions:3.1.1 bitumen-aggregate applicationsthe spraying of liq-uid bitumen on prepared aggreg
8、ate or pavement surfaces,which subsequently are covered with graded aggregate.3.1.2 bitumen-aggregate mixturea combination of bitumi-nous material and aggregate that is physically mixed bymechanical and thermal means,spread on the job site,andcompacted.3.1.3 bitumen applicationsthe uses of sprayed b
9、ituminouscoatings not involving the use of aggregates.Uses of liquidbitumen in this group are all classed as treatments.(See surfacetreatments.)3.1.4 cold-laid plant mixa mixture of liquid bitumen andmineral aggregate prepared in a central bituminous mixingplant and spread and compacted at the job s
10、ite when themixture is at or near ambient temperature.3.1.5 dense-graded aggregateaggregate that is gradedfrom the maximum size down to filler with the object ofobtaining a bituminous mix with a controlled void content andhigh stability.3.1.6 dust bindera light application of bituminous mate-rial fo
11、r the express purpose of laying and bonding loose dust.3.1.7 mixed-in-place(road mix)a bituminous course pro-duced by mixing mineral aggregate and liquid bitumen at thejob site by means of travel plants,motor graders,drags,orspecial road-mixing equipment.Pavement base and surfaces,mixed in place,may
12、 utilize open-graded aggregates(3.1.10),dense-graded aggregates(3.1.5),sand(3.1.14),or sandy soil(3.1.16).3.1.8 mulch treatmenta spray application of bituminousmaterial used to temporarily stabilize a recently seeded area.The bitumen can also be applied to straw or hay mulch as atie-down.3.1.9 multi
13、ple surface treatmenttwo or more surface treat-ments placed one on the other.The maximum aggregate size ofeach successive treatment is usually one half that of theprevious one,and the total thickness is about the same as thenominal maximum size aggregate particles of the first course.1This practice
14、is under the jurisdiction of ASTM Committee D04 on Road andPaving Materials and is the direct responsibility of Subcommittee D04.40 onAsphalt Specifications.Current edition approved Nov.1,2021.Published November 2021.Originallyapproved in 1965.Last previous edition approved in 2017 as D2399 12(2017)
15、.DOI:10.1520/D2399-21.2For 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
16、 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 Barriers to Trade(TBT)Committee.13.1.10 open-graded aggregateone containing little or nomineral filler and in which the void spaces in the compactedaggreg
