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Title: EVALUATION OF MOISTURE EFFECTS ON ASPHALT CONCRETE MIXTURES
Accession Number: 00390802
Record Type: Component
Availability: Find a library where document is available Abstract: Water-induced damage of asphalt concrete mixtures has produced serious pavement distress, poor pavement performance, and increased pavement maintenance in the United States as well as in other areas of the world. This damage is mainly attributable to stripping of asphalt cement from aggregate and, in some cases, possibly to softening of the asphalt matrix. In an attempt to reduce the magnitude of the problem, various antistripping additives have been incorporated into asphalt mixtures. Unfortunately, there has been no way to evaluate their potential effectiveness or to evaluate proposed aggregate-asphalt combinations to determine their water susceptibility. Research results that describe how to determine the extent, nature, and severity of moisture-related damage to asphalt concrete mixtures used in pavements are presented. In addition, the causes of mechanisms that cause deterioration are discussed and related to those mixture and environmental factors associated with moisture damage. Included are evaluations of several testing techniques used to distinguish between aggregate-asphalt combinations that are susceptible to moisture damage and those that are not. Test methods included (a) the indirect tensile test on dry and wet cylindrical specimens, (b) the Texas freeze-thaw pedestal test, and (c) the Texas boiling test. Results of these evaluations show that both the Texas freeze-thaw pedestal test and the boiling test can be used to differentiate between known stripping and nonstripping asphalt mixtures. In addition, the tests can be used to evaluate the indiviual components of mixtures to determine which are water susceptible. A discussion is also presented of the most common treatments considered for use in alleviating the adverse moisture effects on pavement, adding antistripping agents or lime slurry, and pretreating stripping-prone aggregates. It is recommended that the Texas boiling test, which is simple and easy to conduct, be used for initial short-term screening and the Texas freeze-thaw pedestal test be used for final and long-term evaluations. However, if the mixture has high air voids content, it should be evaluated by using the indirect tensile test on dry and wet specimens. (Author)
Supplemental Notes: Publication of this paper sponsored by Committee on Flexible Pavement Construction. 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 #: 01420421
Authors: Kennedy, Thomas WRoberts, Freddy LLee, Kang WEditors: McLaughlin, MaryPagination: pp 134-143
Publication Date: 1983
Serial: ISBN: 0309035546
Media Type: Print
Features: Figures
(4)
; References
(11)
; Tables
(9)
TRT Terms: Uncontrolled Terms: Old TRIS Terms: Subject Areas: Highways; Materials; I31: Bituminous Binders and Materials
Files: TRIS, TRB
Created Date: Dec 30 1984 12:00AM
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