ASTM_D_6521_-_13.pdf

Designation:D652113Standard Practice forAccelerated Aging of Asphalt Binder Using a PressurizedAging Vessel(PAV)1This standard is issued under the fixed designation D6521;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 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 accelerated aging(oxidation)ofasphalt binders by means of pressurized air and elevatedtemperature.This is intended to simulate the changes inrheology which occur in asphalt binders during in-serviceoxidative aging but may not accurately simulate the relativerates of aging.It is normally intended for use with residue fromTest Method D2872(RTFOT),which is designed to simulateplant aging.NOTE1Modified asphalt binders may phase separate or form skinsduring oven conditioning in Test Method D2872(RTFOT);the resultsfrom subsequent testing of this residue may not be representative ofmodified asphalts short-term aged under field conditions.Phaseseparation,or formation of skins,or both can also occur during PAVconditioning.Therefore,the practice may not be suitable for somemodified asphalts.NOTE2PAV conditioning has not been validated for materialscontaining particulate materials.1.2 The aging of asphalt binders during service is affectedby ambient temperature and by mixture-associated variables,such as the volumetric proportions of the mix,the permeabilityof the mix,properties of the aggregates,and possibly otherfactors.This conditioning process is intended to provide anevaluation of the relative resistance of different asphalt bindersto oxidative aging at selected elevated aging temperatures andpressures,but cannot account for mixture variables or providethe relative resistance to aging at in-service conditions.1.3 The values stated in SI units are to be regarded as thestandard.Values in parentheses in inch-pound units are pro-vided for informational purposes only.1.4 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 standard 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:2D8 Terminology Relating to Materials for Roads and Pave-mentsD2872 Test Method for Effect of Heat and Air on a MovingFilm of Asphalt(Rolling Thin-Film Oven Test)D4753 Guide for Evaluating,Selecting,and Specifying Bal-ances and Standard Masses for Use in Soil,Rock,andConstruction Materials TestingD6373 Specification for Performance Graded AsphaltBinderE1137/E1137M Specification for Industrial Platinum Resis-tance Thermometers2.2 AASHTO Standards:3M 320 Specification for Performance-Graded AsphaltBinder2.3 CGA Standards:4CGA G-7.11997 Commodity Specification for Air,FourthEdition3.Terminology3.1 Definitions:3.1.1 Definitions of terms used in this practice may be foundin Terminology D8,determined from common English usage,or combinations of both.4.Summary of Practice4.1 Asphalt binder is normally first conditioned using TestMethod D2872(RTFOT).Residue from the RTFOT is thenplaced in standard stainless steel pans and aged at the specifiedconditioning temperature for 20 h in a vessel pressurized withair to 2.10 MPa.The conditioning temperature is selectedaccording to the grade of asphalt binder.The residue is thenvacuum degassed.1This practice is under the jurisdiction of ASTM Committee D04 on Road andPaving Materials and is the direct responsibility of Subcommittee D04.46 onDurability and Distillation Tests.Current edition approved Sept.1,2013.Published September 2013.Originallyapproved in 2000.Last previous edition approved in 2008 as D6521 08.DOI:10.1520/D6521-13.2For referenced ASTM standards,visit 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.3Available from American Association of State Highway and TransportationOfficials(AASHTO),444 N.Capitol St.,NW,Suite 249,Washington,DC 20001,http:/www.transportation.org.4Available from Compressed Gas Association(CGA),4221 Walney Rd.,5thFloor,Chantilly,VA 20151-2923,http:/.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.Significance and Use5.1 This practice is designed to simulate the in-serviceoxidative aging that occurs in asphalt binders during pavementservice.Residue from this conditioning practice may be used toestimate the physical or chemical properties of asphalt bindersafter several years of in-service aging in the field.5.2 Binders conditioned using this practice are normallyused to determine specification properties in accordance withSpecification D6373 or AASHTO M 320.5.3 For asphalt bi