ASTM D6521-2008 488 Standard Practice for Accelerated Aging of Asphalt Binder Using a Pressurized Aging Vessel (PAV)《用加压老化容器(PAV)进行沥青粘结剂加速老化的标准实施规程》.pdf
《ASTM D6521-2008 488 Standard Practice for Accelerated Aging of Asphalt Binder Using a Pressurized Aging Vessel (PAV)《用加压老化容器(PAV)进行沥青粘结剂加速老化的标准实施规程》.pdf》由会员分享,可在线阅读,更多相关《ASTM D6521-2008 488 Standard Practice for Accelerated Aging of Asphalt Binder Using a Pressurized Aging Vessel (PAV)《用加压老化容器(PAV)进行沥青粘结剂加速老化的标准实施规程》.pdf(6页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 6521 08Standard Practice forAccelerated Aging of Asphalt Binder Using a PressurizedAging Vessel (PAV)1This standard is issued under the fixed designation D 6521; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the ye
2、ar of last revision. 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 the accelerated aging (oxidation) ofasphalt binders by means of pressurized air and elevat
3、edtemperature. 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 D 2872 (RTFOT), which is designed to simulatepla
4、nt aging.NOTE 1Modified asphalt binders may phase separate or form skinsduring oven conditioning in Test Method D 2872 (RTFOT); the resultsfrom subsequent testing of this residue may not be representative ofmodified asphalts short-term aged under field conditions. Phase separa-tion, or formation of
5、skins, or both can also occur during PAV condition-ing. Therefore, the practice may not be suitable for some modifiedasphalts.NOTE 2PAV conditioning has not been validated for materials con-taining particulate materials.1.2 The aging of asphalt binders during service is affectedby ambient temperatur
6、e 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
7、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 in
8、formational 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 pr
9、ior to use.2. Referenced Documents2.1 ASTM Standards:2D8 Terminology Relating to Materials for Roads and Pave-mentsD 2872 Test Method for Effect of Heat andAir on a MovingFilm of Asphalt (Rolling Thin-Film Oven Test)D 4753 Guide for Evaluating, Selecting, and SpecifyingBalances and Standard Masses f
10、or Use in Soil, Rock, andConstruction Materials TestingD 6373 Specification for Performance Graded AsphaltBinderE 1137/E 1137M Specification for Industrial Platinum Re-sistance Thermometers2.2 AASHTO Standards:3M 320 Specification for Performance-Graded AsphaltBinder2.3 CGA Standards:4CGA G-7.11997
11、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 TestMe
12、thod D 2872 (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 with1This practice is under the jurisdiction of ASTM Committee D04 on Road andPaving Materials and is the direct responsibilit
13、y of Subcommittee D04.46 onDurability and Distillation Tests.Current edition approved Jan. 1, 2008. Published January 2008. Originallyapproved in 2000. Last previous edition approved in 2005 as D 6521 05.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Se
14、rvice 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
15、.transportation.org.4Available from Compressed Gas Association (CGA), 4221 Walney Rd., 5thFloor, Chantilly, VA 20151-2923, http:/.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.air to 2.10 MPa. The conditioning temperature is select
16、edaccording to the grade of asphalt binder. The residue is thenvacuum degassed.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 phys
17、ical 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 D 6373 or AASHTO M 320.5.3 For asphalt binders of different grades or
18、from differentsources, there is no unique correlation between the time andtemperature in this conditioning practice and in-service pave-ment age and temperature. Therefore, for a given set ofin-service climatic conditions, it is not possible to select asingle PAV conditioning time, temperature and p
19、ressure thatwill predict the properties or the relative rankings of theproperties of asphalt binders after a specific set of in-serviceexposure conditions.5.4 The relative degree of hardening of different asphaltbinders varies with conditioning temperatures and pressures inthe PAV. Therefore, two as
20、phalt binders may age at a similarrate at one condition of temperature and pressure, but agedifferently at another condition. Hence, the relative rates ofaging for a set of asphalts at PAV conditions may differsignificantly from the actual in-service relative rates at lowerpavement temperatures and
21、ambient pressures.6. Apparatus6.1 An equipment system consisting of a pressure vessel,ovens, pressure-controlling devices, temperature-controllingdevices, pressure and temperature measuring devices, and atemperature and pressure recording system (see Fig. 1).6.1.1 Pressure VesselA stainless steel pr
22、essure vesseldesigned to operate at 2.1 6 0.1 MPa between 90 and 110Cwith interior dimensions adequate to hold ten PAV pans and apan holder. The pan holder shall be capable of holding ten PAVstainless steel pans in a horizontal (level) position, such that theasphalt binder film thickness is reasonab
23、ly uniform. The holdershall be designed for easy insertion and removal from thevessel when the holder, pans, and asphalt binder are at theconditioning temperature. A schematic showing a possibleconfiguration of the vessel, pan holder and pans, and specifyingdimensional requirements is shown in Fig.
24、2.NOTE 3The vessel may be a separate unit to be placed in a forceddraft oven for conditioning the asphalt binders or an integral part of thetemperature control system (for example, by direct heating of the vessel orby surrounding the vessel with a permanently affixed heating unit, forcedair oven, or
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