1、Designation: D490 92 (Reapproved 2011)Standard Specification forRoad Tar1This standard is issued under the fixed designation D490; 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 i
2、ndicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This specification covers 14 grades of tar as follows:RT-1, RT-2, RT-3, RT-4,
3、 RT-5, RT-6, RT-7, RT-8, RT-9, RT-10,RT-11, RT-12, RT.C.B.-5, and RT.C.B.-6.2. Referenced Documents2.1 ASTM Standards:2D4 Test Method for Bitumen ContentD20 Test Method for Distillation of Road TarsD36 Test Method for Softening Point of Bitumen (Ring-and-Ball Apparatus)D70 Test Method for Density of
4、 Semi-Solid BituminousMaterials (Pycnometer Method)D95 Test Method for Water in Petroleum Products andBituminous Materials by DistillationD139 Test Method for Float Test for Bituminous MaterialsD140 Practice for Sampling Bituminous MaterialsD1665 Test Method for Engler Specific Viscosity of TarProdu
5、cts3. Physical Requirements3.1 The tar shall conform to the requirements in Table 1.4. Sampling4.1 The material shall be sampled in accordance withPractice D140.5. Test Methods5.1 The properties enumerated in Table 1 shall be deter-mined in accordance with the following methods, with theexception of
6、 the test specified in 5.1.3:5.1.1 WaterTest Method D95.5.1.2 Specific Gravity Test Method D70.5.1.3 Specific ViscosityTest Method D1665. The resultsshall be reported as specific viscosity compared with water at25C.5.1.4 Float TestTest Method D139.5.1.5 Distillation Test Method D20.5.1.6 Softening P
7、oint Test Method D36.5.1.7 Total Bitumen Test Method D4.1This specification is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.43 onSpecifications and Test for Tar and Tar Products.Current edition approved Dec. 1, 2011. Pu
8、blished December 2011. Originallyapproved in 1938. Last previous edition approved in 2001 as D490 92 (2005).DOI: 10.1520/D0490-92R11.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume infor
9、mation, 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, United States.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any
10、 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
11、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 to ASTM International Headquarters. Your comments will receive careful consideration at
12、 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 address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor D
13、rive, 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), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm
14、.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).TABLE 1 Requirements for TarGradeRT-1GradeRT-2GradeRT-3GradeRT-4GradeRT-5GradeRT-6GradeRT-7Water by volume %, max 2.00 2.00 2.00 2.00 1.5 1.5 1.0Specific gravity at 25/25C(77/77F),
15、min1.08 1.08 1.09 1.09 1.10 1.10 1.12Specific viscosity:AEngler, 50 mL:at 40C (104F)at 50C (122F)5to8.8to13.13 to 22.22 to 35.17 to 26.26 to 40.Float test,As:at 32C (89.6F)at 50C (122F).50 to 80.Distillation test on water-freematerialTotal distillate, mass %:to 170C (338F) 7.0 max 7.0 max 7.0 max 5.
16、0 max 5.0 max 5.0 max 3.0 maxto 200C (392F) . . . . . . .to 235C (455F) . . . . . . .to 270C (518F) 35.0 max 35.0 max 30.0 max 30.0 max 25.0 max 25.0 max 20.0 maxto 300C (572F) 45.0 max 45.0 max 40.0 max 40.0 max 35.0 max 35.0 max 30.0 maxSoftening point (ring-and-ballmethod) of residue fromdistilla
17、tion test30 to 60C(86 to 140F)30 to 60C(86 to 140F)35 to 65C(95 to 149F)35 to 65C(95 to 149F)35 to 70C(95 to 158F)35 to 70C(95 to 158F)35 to 70C(95 to 158F)Total bitumen (soluble incarbon disulfide)weight %, min88 88 88 88 83 83 78GradeRT-8GradeRT-9GradeRT-10GradeRT-11GradeRT-12GradeRT.C.B.-5GradeRT
18、.C.B.-6Water by volume %, max none none none none none 1.0 1.0Specific gravity at 25/25C(77/77F), min1.14 1.14 1.15 1.16 1.16 1.09 1.09Specific viscosity:AEngler, 50 mL:at 40C (104F)at 50C (122F).17 to 26.26 to 40Float test,Asat 32C (89.6F)at 50C (122F)80 to 120.120 to 200.75 to 100.100 to 150.150 t
19、o 220.Distillation test on water-freematerialTotal distillate by masspercent:to 170C (338F) 1.0 max 1.0 max 1.0 max 1.0 max 1.0 max 2.0 to 8.0 2.0 to 8.0to 200C (392F) . . . . . 5.0 min 5.0 minto 235C (455F) . . . . . 8.0 to 18.0 8.0 to 18.0to 270C (518F) 15.0 max 15.0 max 10.0 max 10.0 max 10.0 max
20、 . .to 300C (572F) 25.0 max 25.0 max 20.0 max 20.0 max 20.0 max 35.0 max 35.0 maxSoftening point (ring-and-ballmethod) of residue fromdistillation test35 to 70C(95 to 158F)35 to 70C(95 to 158F)40 to 70C(104 to 158F)40 to 70C(104 to 158F)40 to 70C(104 to 158F)40 to 70C(104 to 158F)40 to 70C(104 to 15
21、8F)Total bitumen (soluble incarbon disulfide) by mass %,min78 78 75 75 75 80 80AThe consistency limits are subdivided into grades RT-1 to RT-12, inclusive, and grades RT.C.B.-5, RT.C.B.-6, so that material may be chosen to meet the localconditions of temperature, road conditions, and climate.D490 92 (2011)2
