ASTM D6521-2005 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 D6521-2005 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 D6521-2005 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 05Standard 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 type of changeswhich occur in asphalt binders during in-service oxidativeaging but may not accurately simulate the relative rates ofaging. It is intended for use with residue from Test MethodD 2872 (RTFOT), which is designed to simulate plant aging.NOT
4、E 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 skins, or bo
5、th can also occur during PAV aging.Therefore, the practice may not be suitable for some modified asphalts.NOTE 2PAV has not been validated for materials containing particu-late materials.1.2 The aging of asphalt binders during service is affectedby ambient temperature and air pressure and by mixture
6、-associated variables, such as the volumetric proportions of themix, the permeability of the mix, properties of the aggregates,and possibly other factors. This conditioning process is in-tended to provide an evaluation of the relative resistance ofdifferent asphalt binders to oxidative aging at sele
7、cted elevatedaging temperatures and pressures, but cannot account formixture variables or provide the relative resistance to aging atin-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 pu
8、rposes 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.
9、Referenced Documents2.1 ASTM Standards:2D8 Terminology Relating to Materials for Roads and Pave-mentsD 1754 Test Method for Effect of Heat and Air on AsphalticMaterials (Thin-Film Oven Test)D 2872 Test Method for Effect of Heat andAir on a MovingFilm of Asphalt (Rolling Thin-Film Oven Test)D 4753 Gu
10、ide for Evaluating, Selecting and SpecifyingBalances and Standard Masses for 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 Specificat
11、ion for Performance-Graded AsphaltBinderMP 1a 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 D8determined from c
12、ommon English usage,or combinations of both.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 July 15, 2005. Published August 2005. Originally
13、approved in 2000. Last previous edition approved in 2004 as D 652104.2For 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
14、website.3Available from American Association of State Highway and TransportationOfficials (AASHTO), 444 N. Capitol St., NW, Suite 249, Washington, DC 20001.4Available from Compressed Gas Association (CGA), 1725 Jefferson DavisHwy., Suite 1004, Arlington, VA 22202-4102.1Copyright ASTM International,
15、100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4. Summary of Practice4.1 Asphalt binder is first aged using Test Method D 2872(RTFOT). A specified thickness of residue from the RTFOT isthen placed in standard TFOT stainless steel pans and aged atthe specified agi
16、ng temperature for 20 h in a vessel pressurizedwith air to 2.10 MPa. Aging temperature is selected accordingto the grade of this asphalt binder. The residue is then vacuumdegassed.5. Significance and Use5.1 This practice is designed to simulate the type of in-service oxidative aging that occurs in a
17、sphalt binders duringpavement service. Residue from this conditioning practice maybe used to estimate the physical or chemical properties ofasphalt binders after several years of in-service aging in thefield.5.2 Binders aged using this practice are used to determinespecification properties in accord
18、ance with SpecificationD 6373, AASHTO M 320, or AASHTO MP 1a.5.3 For asphalt binders of different grades or from differentsources, there is no unique correlation between the aging timeand temperature in this conditioning practice and in-servicepavement age and temperature. Therefore, for a given set
19、 ofin-service climatic conditions, it is not possible to select asingle PAV aging time and elevated temperature and pressurethat will predict the properties or the relative rankings of theproperties of all asphalt binders after a specific set of in-serviceexposure conditions.5.4 The relative degree
20、of hardening of different asphaltbinders varies with aging temperatures and pressures in thePAV. Therefore, two asphalt binders may age at a similar rateat one condition of temperature and pressure, but age differ-ently at another condition. Hence, the relative rates of aging fora set of asphalts at
21、 PAV conditions may differ significantlyfrom the actual in-service relative rates at lower temperaturesand pressures.6. Apparatus6.1 An equipment system consisting of a pressure vessel,ovens, pressure-controlling devices, temperature-controllingdevices, pressure and temperature measuring devices, an
22、d atemperature and pressure recording system (see Fig. 1).6.1.1 Pressure VesselA stainless steel pressure vesseldesigned to operate at 2.1 6 0.1 MPa between 90 and 110Cwith interior dimensions adequate to hold ten TFOT pans anda pan holder. The pressure vessel shall contain a pan holdercapable of ho
23、lding ten TFOT stainless steel pans in a horizontal(level) position, such that the asphalt binder film thickness isreasonably uniform. The holder shall be designed for easyinsertion and removal from the vessel when the holder, pans,FIG. 1 Schematic of PAV Test SystemD6521052and asphalt binder are at
24、 the aging temperature. A schematicshowing a possible configuration of the vessel, pan holder andpans, and specifying dimensional requirements is shown in Fig.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 thet
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