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Standard Practice for Accelerated Aging of Asphalt Binder Using a Pressurized Aging Vessel (PAV)
Automatische name übersetzung:
Standard Praxis für beschleunigte Alterung von Asphalt Binder mit einem Hochdruckalterungsbehälter (PAV)
NORM herausgegeben am 1.9.2013
Bezeichnung normen: ASTM D6521-13
Anmerkung: UNGÜLTIG
Ausgabedatum normen: 1.9.2013
SKU: NS-35477
Zahl der Seiten: 6
Gewicht ca.: 18 g (0.04 Pfund)
Land: Amerikanische technische Norm
Kategorie: Technische Normen ASTM
Binders. Sealing materialsRoad construction materialsWaxes, bituminous materials and other petroleum products
Keywords:
accelerated aging, elevated temperature, in-service aging, PAV, pressure aging, pressure aging vessel, vacuum degassing, ICS Number Code 75.140 (Waxes, bituminous materials and other petroleum products), 91.100.50 (Binders. Sealing materials), 93.080.20 (Road construction materials)
Significance and Use | ||||||||||||||
5.1 This practice is designed to simulate the in-service oxidative aging that occurs in asphalt binders during pavement service. Residue from this conditioning practice may be used to estimate the physical or chemical properties of asphalt binders after several years of in-service aging in the field. 5.2 Binders conditioned using this practice are normally used to determine specification properties in accordance with Specification D6373 or AASHTO M 320. 5.3 For asphalt binders of different grades or from different sources, there is no unique correlation between the time and temperature in this conditioning practice and in-service pavement age and temperature. Therefore, for a given set of in-service climatic conditions, it is not possible to select a single PAV conditioning time, temperature and pressure that will predict the properties or the relative rankings of the properties of asphalt binders after a specific set of in-service exposure conditions. 5.4 The relative degree of hardening of different asphalt binders varies with conditioning temperatures and pressures in the PAV. Therefore, two asphalt binders may age at a similar rate at one condition of temperature and pressure, but age differently at another condition. Hence, the relative rates of aging for a set of asphalts at PAV conditions may differ significantly from the actual in-service relative rates at lower pavement temperatures and ambient pressures. |
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1. Scope | ||||||||||||||
1.1 This practice covers the accelerated aging (oxidation) of asphalt binders by means of pressurized air and elevated temperature. This is intended to simulate the changes in rheology which occur in asphalt binders during in-service oxidative aging but may not accurately simulate the relative rates of aging. It is normally intended for use with residue from Test Method D2872 (RTFOT), which is designed to simulate plant aging. 1.2 The aging of asphalt binders
during service is affected by ambient temperature and by
mixture-associated variables, such as the volumetric proportions of
the mix, the permeability of the mix, properties of the aggregates,
and possibly other factors. This conditioning process is intended
to provide an evaluation of the relative resistance of different
asphalt binders to oxidative aging at selected elevated aging
temperatures and pressures, but cannot account for mixture
variables or provide the relative resistance to aging at in-service
conditions.
1.3 The values stated in SI units are to be regarded as the standard. Values in parentheses in inch-pound units are provided for informational purposes only. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. |
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2. Referenced Documents | ||||||||||||||
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