1、Designation: D4552/D4552M 10Standard Practice forClassifying Hot-Mix Recycling Agents1This standard is issued under the fixed designation D4552/D4552M; the number immediately following the designation indicates theyear of original adoption or, in the case of revision, the year of last revision. A nu
2、mber in parentheses indicates the year of lastreapproval. A superscript epsilon () 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 be ident
3、ified. The products are classifiedby viscosity in mm2/s measured at 60C 140F. This practicedoes not apply to emulsified materials.1.2 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; there
4、fore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.3 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 standar
5、d 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:2D70 Test Method for Density of Semi-Solid BituminousMaterials (Pycnometer Method)D92 Test Method for Flash and Fire Points by Cle
6、velandOpen Cup TesterD140 Practice for Sampling Bituminous MaterialsD946 Specification for Penetration-Graded Asphalt Cementfor Use in Pavement ConstructionD1298 Test Method for Density, Relative Density (SpecificGravity), or API Gravity of Crude Petroleum and LiquidPetroleum Products by Hydrometer
7、MethodD1754 Test Method for Effects of Heat andAir onAsphalticMaterials (Thin-Film Oven Test)D2007 Test Method for Characteristic Groups in RubberExtender and Processing Oils and Other Petroleum-Derived Oils by the Clay-Gel Absorption Chromato-graphic MethodD2170 Test Method for Kinematic Viscosity
8、of Asphalts(Bitumens)D2171 Test Method for Viscosity of Asphalts by VacuumCapillary ViscometerD2872 Test Method for Effect of Heat and Air on a MovingFilm of Asphalt (Rolling Thin-Film Oven Test)D3381 Specification for Viscosity-Graded Asphalt Cementfor Use in Pavement Construction3. Significance an
9、d 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 desired properties to the mixture.
10、 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 describes recycling agents (RA) as
11、 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 specified include flash point (handling)
12、, weightpercent of saturates (compatibility), selected properties of theRTF or TF oven residue (durability), and specific gravity.1This practice is under the jurisdiction of ASTM Committee D04 on Road andPaving Materials and is the direct responsibility of Subcommittee D04.40 onAsphalt Specification
13、s.Current edition approved June 15, 2010. Published July 2010. Originallyapproved in 1986. Last previous edition approved in 2004 as D455292 (2004).DOI: 10.1520/D4552_D4552M-10.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. F
14、or 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, United States.4.2 The choice of RA grade will depend on the amount andhardness of t
15、he asphalt in the aged pavement. In general, thelower viscosity RA types can be used to restore aged asphaltsof high viscosity and vice versa.Additionally, grades RA1, RA5, RA 25, and RA 75 will generally be most appropriate forhot-mix recycling of salvaged asphalt concrete when no morethan 30 % vir
16、gin aggregate is added, while grades RA 250 andRA 500 will generally 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
17、 in Table 1.5.2 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 D140.ASTM International t
18、akes 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 their own
19、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 should be addr
20、essed 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 Standards, at
21、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 610-832-9585 (
22、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 Physical Properties of Hot-Mix Recycling AgentsNOTECompliance requires the aspha
23、lt be extracted from the pavement to be recycled and combined with the recycling agent being tested. Thiscombination 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 Specific
24、ation D946 or Table 1, 2 or 3 of Specification D3381.TestASTMTestMethodRA 1 RA 5 RA 25 RA 75 RA 250 RA 500Min Max Min Max Min Max Min Max Min Max Min MaxViscosity 60C 140F,mm2/sD2170orD217150 175 176 900 901 4500 4501 12500 12501 37500 37501 60000Flash Point, COC, C F D92 219 425 . 219 425 . 219 425
25、 . 219 425 . 219 425 . 219 425 .Saturates,wt,% D2007 . 30 . 30 . 30 . 30 . 30 . 30Tests on Residuefrom RTFO orTFO oven163C 325FD2872orD1754Viscosity RatioA“ . 3 . 3 . 3 . 3 . 3 . 3Wt Change,6,% “ . 4 . 4 . 3 . 3 . 3 . 3Specific Gravity D70orD1298Report Report Report Report Report ReportAViscosity Ratio 5Viscosity of Residue from RTFO or TFO Oven Test 60C 140F,cSTOriginal Viscosity 60C 140F,cStD4552/D4552M 102
