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Title:

INVESTIGATION OF LABORATORY AGING PROCEDURES FOR ASPHALT-AGGREGATE MIXTURES

Accession Number:

00622186

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309051630

Abstract:

A Strategic Highway Research Program project--entitled Performance-Related Testing and Measuring of Asphalt-Aggregate Interactions and Mixtures--includes development of procedures to age mixtures in the laboratory. Two major effects dominate aging of asphalt-aggregated mixtures: (a) loss of volatile components and oxidation in the construction phase (short-term aging) and (b) progressive oxidation of the in-place mixture in the field (long-term aging). Other factors may contribute to aging. In particular, molecular structuring may occur over a long period of time, resulting in steric hardening. Actinic light, primarily in the ultraviolet range, also has an effect, particularly in desert-like climates. Aging may result in hardening (stiffening) of the mixture, which alters the performance of the mixture. This may be beneficial, because a stiffer mixture will have improved load-distribution properties and will be more resistant to permanent deformation. However, aging may also result in embrittlement (increased tendency to crack and ravel) and loss of durability in terms of wear resistance and moisture susceptibility. Preliminary tests to evaluate aging methods for asphalt-aggregate mixtures have been conducted. Short-term methods include oven aging and extended mixing; long-term methods include oven aging and oxygen enrichment. The effects of temperature level and duration of aging are noted. Test specimens were fabricated from two asphalts and two aggregates, representing extreme property levels. The four mixture combinations were prepared at two levels of permeability representing good and moderate compaction conditions. The effects of aging were determined using the diametral resilient modulus test.

Supplemental Notes:

This paper appears in Transportation Research Record No. 1323, Asphalt Mix Materials 1991. 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 Title:

Asphalt mix materials, 1991

Monograph Accession #:

01407199

Authors:

Bell, C A
AbWahab, Y
Cristi, M E

Pagination:

p. 32-46

Publication Date:

1991

Serial:

Transportation Research Record

Issue Number: 1323
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309051630

Features:

Figures (24) ; References (7) ; Tables (9)

Old TRIS Terms:

Subject Areas:

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

Files:

TRIS, TRB, ATRI

Created Date:

May 31 1992 12:00AM

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