1、Designation: D2728 98 (Reapproved 2009)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
2、of last 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-
3、nance of pavements.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 The definitions of terms not includ
4、ed in Terminology D8are 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 mi
5、xingplant, 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
6、hot 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.
7、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, and dis-tresse
8、d areas in existing pavements. These mixes are suitablefor use in relatively small areas, applied at ambient tempera-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,
9、 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 maintenan
10、ce 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 depend u
11、pon 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 pr
12、ovide proper viscosity 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 pra
13、ctice to apply tar at the lowest temperature thatwill provide the required spray pattern, viscosity, adhesion, andso 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 responsi
14、bility of SubcommitteeD04.43 on Specifications and Test for Tar and Tar Products.Current edition approved Dec. 1, 2009. Published January 2010. Originallyapproved in 1968. Last previous edition approved in 2003 as D2728 98 (2003).DOI: 10.1520/D2728-98R09.2For referenced ASTM standards, visit the AST
15、M 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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, Unite
16、d States.ASTM International takes no 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 ri
17、ghts, 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 either for revision of this standard or for additiona
18、l standardsand should be addressed to 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 AST
19、M Committee on Standards, at the address 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 abov
20、eaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).TABLE 1 Recommended Paving Uses and Application Temperature
21、sUsesRoad 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 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 1649CD2728 98 (2009)2
