1、Designation:D239912Standard 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 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 u
5、se.2.Referenced Documents2.1 ASTM Standards:2D2026 Specification for Cutback Asphalt(Slow-CuringType)D2027 Specification for Cutback Asphalt(Medium-CuringType)D2028 Specification for Cutback Asphalt(Rapid-CuringType)3.Terminology3.1 Definitions:3.1.1 bitumen-aggregate applicationsthe spraying of liq
6、-uid bitumen on prepared aggregate 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 ap
7、plicationsthe uses of sprayed bituminouscoatings 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 sp
8、read and compacted at the job-site 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 binder a light applic
9、ation of bituminous mate-rial for 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
10、 and surfaces,mixed in place,may utilize open-graded aggregates(3.1.10),dense-graded aggregates(3.1.5),sand(3.1.15),or sandy soil(3.1.17).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 ha
11、y mulch as atie-down.3.1.9 multiple 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
12、the first course.3.1.10 open-graded aggregateone containing little or nomineral filler and in which the void spaces in the compactedaggregate are relatively large.3.1.11 patch mixa mixture of bituminous material andmineral aggregate for patching holes,depressions,and dis-tressed areas in existing pa
13、vements.These mixes are suitablefor use in relatively small areas,applied at ambient temperatureusing hand-laying and hand-compaction techniques.Thesemixes may be designed for immediate use or for stock-pilingfor a period of time prior to use.1This practice is under the jurisdiction of ASTM Committe
14、e D04 on Road andPaving Materials and is the direct responsibility of Subcommittee D04.40 onAsphalt Specifications.Current edition approved June 15,2012.Published July 2012.Originallyapproved in 1965.Last previous edition approved in 2005 as D2399 83(2005).DOI:10.1520/D2399-12.2For referenced ASTM s
15、tandards,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 1942
16、8-2959.United States1 3.1.12 pavement base and surfacesthe lower or underly-ing pavement course atop the subbase or subgrade and the topor wearing course.Cold-laid mixtures that are bound togetherwith liquid bitumens use either open or dense aggregategradations.3.1.13 penetration macadama pavement construction us-ing essentially one-size coarse aggregate,which is penetratedin place by a heavy application of high-viscosity bituminousmaterial.This application is followed by an application of asmal
