1、Designation:D272898(Reapproved 2019)Standard Practice forPaving Uses and Application Temperatures for Road Tars1This standard is issued under the fixed designation D2728;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of las
2、t 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 practice covers the selection and application tem-peratures of road tar grades in the construction and mainte-nance of pa
3、vements.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for
4、 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:2D8 Terminology Relating to Materials for Roads and Pave-ments3.Terminology3.1 Definitions:The definitions o
5、f terms not included inTerminology D8 are listed below.3.1.1 dust palliativea light application of a low-viscositybituminous material for the express purpose of laying andbonding dust or preventing a dust nuisance.3.1.2 plant mixa mixture of bituminous material andmineral aggregate prepared in a cen
6、tral bituminous mixingplant,then spread and compacted at the job site.Plant mixesinclude:3.1.2.1 cold-lay tar concretea plant mix containing amedium-viscosity grade of tar and a less densely gradedaggregate designed to be laid either shortly after mixing orwhen the mixture is at or near ambient temp
7、erature.3.1.2.2 hot-lay tar concretea plant mix containing a high-viscosity grade of tar and a densely graded mineral aggregate,designed to be laid at or near the elevated temperature ofmixing.3.1.2.3 sand mixa plant mix containing sand aggregateand a high-viscosity grade of tar designed to be laid
8、immedi-ately.3.1.2.4 soil mixa plant mix containing soil aggregate anda low-to-medium viscosity grade of bituminous material,usually designed to be stockpiled,then laid following a periodof seasoning.3.1.3 patch mixa mixture of bituminous material andmineral aggregate for patching holes,depressions,
9、and dis-tressed areas in existing pavements.These mixes are suitablefor use in relatively small areas,applied at ambienttemperature,using hand-laying and hand-compaction tech-niques.These mixes may be designed for immediate use or forstockpiling prior to use.3.1.4 sand aggregatenon-plastic mineral a
10、ggregate,es-sentially all passing the 4.75-mm sieve,and containing nomore than a minor percentage passing the 75-m sieve.4.Significance and Use4.1 This practice provides information on the recommendeduses and application temperatures for the various grades ofroad tar used in the construction and mai
11、ntenance of pave-ments.5.Recommended Uses5.1 The recommendations shown in Table 1 are for use onlyas a guide when using tar for pavement construction andmaintenance.Several grades of tar may be listed in the table forthe same general construction procedure.Selection of a par-ticular grade will depen
12、d upon local practice,equipmentavailability,traffic,and environmental conditions applicable tothe specific project being considered.6.Recommended Application Temperatures6.1 The temperature ranges listed in Table 1 for the severalroad tar grades show the minimum and maximum temperaturesthat will pro
13、vide proper viscosity for application.In general,the lower application temperatures may be used when highertemperatures of aggregate and pavement surfaces prevail.1This practice is under the jurisdiction of ASTM Committee D04 on Road andPaving Materials and is the direct responsibility of Subcommitt
14、ee D04.43 onSpecifications and Test for Tar and Tar Products.Current edition approved May 1,2019.Published May 2019.Originallyapproved in 1968.Last previous edition approved in 2014 as D2728 98(2014).DOI:10.1520/D2728-98R19.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact
15、 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 StatesThis international standard was de
16、veloped 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.1 Higher application temperatures are employed when the tar isto be mixed,or where dust or moisture films are encountered.It is good practice to apply tar at the lowest temperature thatwill provide the required spray pat
