1、Designation: D 2728 98 (Reapproved 2003)Standard Practice forPaving Uses and Application Temperatures for Road Tars1This standard is issued under the fixed designation D 2728; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the yea
2、r of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 main
3、te-nance of pavements.2. Referenced Documents2.1 ASTM Standards:D 8 Standard Terminology Relating to Materials for Roadsand Pavements23. Terminology3.1 The definitions of terms not included in TerminologyD 8 are listed below.3.1.1 dust palliativea light application of a low-viscositybituminous mater
4、ial 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 mixingplant, then spread and compacted at the job site. Plant mixesinclude:3.1.2.1 cold lay tar concretea plant mi
5、x 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 lay tar concretea plant mix containing a highviscosity grade of tar and a densely graded mineral aggregate,d
6、esigned 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 soil mixa plant mix containing soil aggregate anda low-to-medium viscosity grade of bituminous material,usua
7、lly 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 in existing pavements. These mixes are suitablefor use in relatively small areas, applied at ambient tem
8、pera-ture, using hand-laying and hand-compaction techniques.These mixes may be designed for immediate use or forstock-piling prior to use.3.1.4 sand aggregatenon-plastic mineral aggregate, es-sentially all passing the 4.75-mm sieve, and containing nomore than a minor percentage passing the 75-m siev
9、e.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-ments.5. Recommended Uses5.1 The recommendations shown in Table 1 are for use onlyas a guide when usi
10、ng 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 practice, equipmentavailability, traffic, and environmental conditions applicable tothe specific proje
11、ct 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 viscosity for application. In general,the lower application temperatures may be used when highertem
12、peratures 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 the lowest temperature thatwill provide the required spray pattern, viscosity, adhesion, a
13、ndso forth.7. Keywords7.1 application temperature; road tar1This 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 Tests for Tar and Tar Products.Current edition approved July
14、10, 2003. Published September 2003. Originallyapproved in 1968. Last previous edition approved in 1998 as D 2728 98.2Annual Book of ASTM Standards, Vol 04.03.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.ASTM International takes no
15、 position 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 respons
16、ibility.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 either for revision of this standard or for additional standardsand should be addressed t
17、o ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the add
18、ress shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone),
19、 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).TABLE 1 Recommended Paving Uses and Application TemperaturesUsesRoad Tar GradesRT-1 RT-2 RT-3 RT-4 RT-5 RT-6 RT-7 RT-8 RT-9 RT-10 RT-11 RT-12 RTCB-5 RTCB-6Dust palliative 33Prime coat 333Tack coat 33Seal coat
20、 or surface treatment 33333Road mix (mixed in place):Coarse aggregate 3333Graded aggregate 3333Sand aggregate 3333Soil aggregate 3333Plant mix:Hot lay tar concrete 333Cold lay tar concrete 33Sand mix 333Soil mix 333Patch mix:To use immediately 333To stockpile 3 33Penetration macadam 3Crack filler 333Application temperatures, C 1652C 2766C 66107C 79121C 1649CD 2728 98 (2003)2
