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Title:

EVALUATION OF LABORATORY METHODS SIMULATING AGING EFFECTS OF ASPHALT BINDER

Accession Number:

00714789

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/issn/03611981

Abstract:

The effects of short-term and long-term aging are important when evaluating the properties of asphalt binder. Thus, the properties of asphalts aged for the short term and the long term are considered in the Superpave binder specification. The most practical way of predicting the effects of aging within an asphalt binder is through laboratory simulation methods. For many years the thin film oven test (TFOT) method and the rolling thin film oven test (RTFOT) method have been used to simulate short-term aging. To simulate long-term aging the pressure aging vessel (PAV) method was developed within the Strategic Highway Research Program. However, the Superpave binder specification uses only the RTFOT method for short-term aging and uses RTFOT along with the PAV method for long-term aging. For a short period of time AASHTO considered the use of either the TFOT method or the RTFOT method and then the PAV long-term aging procedure for short-term aging. Unfortunately, few published data address this issue. The test data from a testing program conducted to evaluate these laboratory procedures for short-term and long-term aging with different asphalt binders are presented. The effects of aging are evaluated by dynamic shear stiffness, measured by using the dynamic shear rheometer at three intermediate temperatures. The data indicate that there are no significant differences at the 95% confidence interval between the properties of RTFOT-aged residues and those of TFOT-aged residues after exposure to the PAV procedure. The differences before aging by the PAV procedure, however, still exist. It is recommended that only one short-term aging procedure be used for the Superpave binder specification and that work be conducted to develop or improve the short-term aging procedure.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1488, Unmodified and Modified Asphalt Binders. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

Monograph Accession #:

01399832

Language:

English

Authors:

Phromsorn, Chayatan J
Kennedy, Thomas W

Pagination:

p. 13-20

Publication Date:

1995

Serial:

Transportation Research Record

Issue Number: 1488
Publisher: Transportation Research Board
ISSN: 0361-1981

Features:

Figures (3) ; References (8) ; Tables (7)

Old TRIS Terms:

Subject Areas:

Highways; Materials; Research; I31: Bituminous Binders and Materials

Files:

TRIS, TRB, ATRI

Created Date:

Nov 29 1995 12:00AM

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