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Title:

EVALUATION AND DEVELOPMENT OF A PRESSURE AGING VESSEL FOR ASPHALT CEMENT

Accession Number:

00636328

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309054621

Abstract:

This study evaluates a pressure aging vessel (PAV) for asphalt cement, with the specific objectives of examining the safety of the procedure and the effects of aging temperature, film thickness on aging, vertical location within the PAV, and proximity of aging asphalt to other asphalts. Four Strategic Highway Research Program (SHRP) core asphalts (AAC-1, AAD-1, AAF-1, and AAG-1) were used in this study. An interlaboratory test program to establish the variability associated with the PAV conditioning procedure was conducted. The study indicated that the PAV operated at 71 deg C (160 deg F), 2.07 x 10 to the 6th power pascals (300 psi) air pressure for 144 hr, effectively simulates 2 to 10 years of pavement aging depending on the method used to measure hardening, air voids in the paving mixture, average ambient temperature, and other factors. Degree of oxidative hardening of asphalt increases with increase in temperature. For a given temperature and time of exposure, degree of hardening increases with decrease in asphalt film thickness. The vertical location of asphalt in the PAV and proximity to other asphalts had no effect on the extent of hardening. Different asphalts exhibited different rates of hardening at the same conditions of temperature and time. After this work was essentially completed, the SHRP PAV conditioning protocol was modified by increasing the temperature and decreasing the time of aging. This was done to accommodate the needs of state departments of transportation for an aging test requiring no more than 24 hr.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1391, Asphalt Cement and Asphalt/Polymer Blends. 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 #:

01403229

Language:

English

Authors:

Button, Joe W
Jawle, Manoj
Jagadam, Vidyasagar
Little, Dallas N

Pagination:

p. 11-19

Publication Date:

1993

Serial:

Transportation Research Record

Issue Number: 1391
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309054621

Features:

Figures (6) ; References (7) ; Tables (1)

Uncontrolled Terms:

Film thickness; Pressure aging vessels

Old TRIS Terms:

Subject Areas:

Highways; Materials; Safety and Human Factors; I31: Bituminous Binders and Materials

Files:

TRIS, TRB, ATRI

Created Date:

Sep 14 1993 12:00AM

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