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Title:

CHANGES IN ASPHALTS

Accession Number:

00450690

Record Type:

Component

Availability:

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Order URL: http://worldcat.org/isbn/0309038081

Abstract:

A review of recently published literature indicates that changes in asphalts are of considerable concern to those responsible for designing, constructing, and managing pavements. Data indicate that the ranges of properties of asphalts have not changed significantly, but recent world petroleum supply and economic climate may have caused more rapid changes in asphalt from certain sources. New refining or manufacturing techniques may also affect asphalt properties, but these causes probably account for a smaller portion of reported changes than variations in feedstocks that are primarily petroleum crude oils. There appears to have been a statistically significant but small change to a population of more temperature-susceptible asphalts, which may have been a result of specification changes and greater use of high smoke point asphalts (that may generally have higher temperature susceptibilities) with the use of increased mixing temperatures in drum mixers. Preferred methods of measuring low temperature performance are through the use of low temperature consistency measurements. Chemical analyses reported to date have not correlated well with performance because of the complex nature of asphalts. The changes in asphalt properties with use of antistripping additives is discussed and some factors affecting paving construction and pavement performance, which may be perceived as changes in asphalts, are listed.

Supplemental Notes:

Publication of this paper sponsored by Committee on General Asphalt Problems.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 #:

01419880

Authors:

Hodgson, Roy S

Editors:

Withers, Julia

Pagination:

pp 10-12

Publication Date:

1984

Serial:

Transportation Research Record

Issue Number: 999
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

0309038081

Media Type:

Print

Features:

References (11)

Uncontrolled Terms:

Change; Susceptibility

Subject Areas:

Highways; Materials; I31: Bituminous Binders and Materials

Files:

TRIS, TRB

Created Date:

Feb 28 1986 12:00AM

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