1、Designation: D 4552 92 (Reapproved 2004)Standard Practice forClassifying Hot-Mix Recycling Agents1This standard is issued under the fixed designation D 4552; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision
2、. 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 a standardized method wherebypetroleum product additives to be used in hot recycling ofasphalt concrete can b
3、e identified. The products are classifiedby viscosity in centistokes measured at 140F (60C). Thispractice does not apply to emulsified materials.1.2 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this stand
4、ard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 70 Test Method for Specific Gravity and Density ofSemi-Solid Bituminous Materials (Pycnometer Method)D 92 Test Method for Fla
5、sh and Fire Points by ClevelandOpen Cup TesterD 140 Practice for Sampling Bituminous MaterialsD 946 Specification for Penetration-Graded Asphalt Ce-ment for Use in Pavement ConstructionD 1298 Test Method for Density, Relative Density (SpecificGravity), or API Gravity of Crude Petroleum and LiquidPet
6、roleum Products by Hydrometer MethodD 1754 Test Method for Effect of Heat and Air on AsphalticMaterials (Thin-Film Oven Test)D 2007 Test Method for Characteristic Groups in RubberExtender and Processing Oils and Other Petroleum-Derived Oils by the Clay Gel Adsorption ChromatographicMethodD 2170 Test
7、 Method for Kinematic Viscosity of Asphalts(Bitumens)D 2171 Test Method for Viscosity of Asphalts by VacuumCapillary ViscometerD 2872 Test Method for Effect of Heat and Air on a MovingFilm of Asphalt (Rolling Thin-Film Oven Test)D 3381 Specification for Viscosity-Graded Asphalt Cementfor Use in Pave
8、ment Construction3. Significance and Use3.1 Recycling of deteriorated asphalt pavements is beingused with increasing frequency for its economy and benefit ofconserving raw materials. The objective of recycling is to reusethe two ingredients of asphalt concrete-aggregate and asphaltand to restore the
9、 desired properties to the mixture. Recyclingis carried out hot or cold, depending on the condition of thedeteriorated pavement, construction procedure, availability ofequipment, and cost. This practice is for classifying recyclingagents to be used in hot recycling.4. Classification4.1 This practice
10、 describes recycling agents (RA) as belong-ing to one of the following six groups: RA 1, RA 5, RA 25, RA75, RA 250, or RA 500, as shown in Table 1. The viscosityranges are designed to avoid overlap and to provide sufficientflexibility to satisfy a wide range of mix proportions. Otherproperties speci
11、fied include flash point (handling), weightpercent of saturates (compatibility), selected properties of theRTF or TF oven residue (durability), and specific gravity.4.2 The choice of RA grade will depend on the amount andhardness of the asphalt in the aged pavement. In general, thelower viscosity RA
12、 types can be used to restore aged asphaltsof high viscosity and vice versa. Additionally, grades RA 1, RA5, RA 25, and RA 75 will generally be most appropriate forhot-mix recycling of salvaged asphalt concrete when no morethan 30 % virgin aggregate is added, while grades RA 250 andRA 500 will gener
13、ally be most appropriate when more than30 % virgin aggregate is incorporated into the mix.5. Physical Properties5.1 All recycling agents must be homogeneous, free-flowing at pumping temperature, and must conform to therequirements shown in Table 1.1This practice is under the jurisdiction of ASTM Com
14、mittee D04 on Road andPaving Materials and is the direct responsibility of Subcommittee D04.40 onAsphalt Specifications.Current edition approved July 1, 2004. Published July 2004. Originally approvedin 1986. Last previous edition approved in 1999 as D 4552 92 (1999).2For referenced ASTM standards, v
15、isit the ASTM 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
16、-2959, United States.5.2 The final acceptance of recycling agents meeting therequirements shown in Table 1 is subject to the compliance ofthe reconstituted asphalt blends with current asphalt specifica-tions.6. Sampling6.1 All sampling shall be carried out in accordance withPractice D 140.ASTM Inter
17、national 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 rights, are entirely
18、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 additional standardsand shou
19、ld 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 ASTM Committee on Stan
20、dards, 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 aboveaddress or at 610-
21、832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).TABLE 1 Physical Properties of Hot-Mix Recycling AgentsNOTECompliance requires the asphalt be extracted from the pavement to be recycled and combined with the recycling agent being tested. Th
22、iscombination should be in accordance with ratio of recycling agent to recovered asphalt used in the mix. The resulting mixture must meet all specificationsfor the appropriate grade within Specification D 946 or Table 1, 2 or 3 of Specification D 3381.TestASTMTestMethodRA 1 RA 5 RA 25 RA 75 RA 250 R
23、A 500Min Max Min Max Min Max Min Max Min Max Min MaxViscosity 140F,cStD 2170orD 217150 175 176 900 901 4500 4501 12500 12501 37500 37501 60000Flash Point,COC,F D 92 425 . 425 . 425 . 425 . 425 . 425 .Saturates,wt,% D 2007 . 30 . 30 . 30 . 30 . 30 . 30Tests on Residuefrom RTFO orTFO oven325FD 2872orD 1754Viscosity RatioA“ . 3 . 3 . 3 . 3 . 3 . 3Wt Change,6,% “ . 4 . 4 . 3 . 3 . 3 . 3Specific Gravity D 70orD 1298Report Report Report Report Report ReportAViscosity Ratio 5Viscosity of Residue from RTFO or TFO Oven Test 140F,cSTOriginal Viscosity 140F,cStD 4552 92 (2004)2
