1、Designation:D272898(Reapproved 2014)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.2.Referenced Documents2.1 ASTM Standards:2D8 Terminology Relating to Materials for Roads and Pave-ments3.Terminology3.1 Definitions:The definitions of terms not included
4、 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 central bituminous mixi
5、ngplant,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 temperature.3.1.2.2 hot
6、lay tar concretea plant mix containing a highviscosity 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 immedi-ately.3.1.2.4
7、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,and dis-tressed areas
8、 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 forstock-piling prior to use.3.1.4 sand aggregatenon-plastic mineral aggregate,es-sentiall
9、y 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 maintenance of pave-men
10、ts.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 depend upon local practic
11、e,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 provide proper viscosit
12、y for application.In general,the lower application temperatures may be used when highertemperatures of aggregate and pavement surfaces prevail.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 t
13、he lowest temperature thatwill provide the required spray pattern,viscosity,adhesion,andso forth.1This recommended practice is under the jurisdiction of ASTM Committee D04on Road and Paving Materials and is the direct responsibility of SubcommitteeD04.43 on Specifications and Test for Tar and Tar Pr
14、oducts.Current edition approved June 1,2014.Published November 2014.Originallyapproved in 1968.Last previous edition approved in 2009 as D2728 98(2009).DOI:10.1520/D2728-98R14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For An
15、nual 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 7.Keywords7.1 application temperature;road tarASTM International takes no positi
16、on respecting the validity of any patent rights asserted in connection with any item mentionedin this standard.Users of this standard are expressly advised that determination of the validity of any such patent rights,and the riskof infringement of such rights,are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised,either reapproved or withdrawn.Your comments are invited e
