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Title:

VISCOELASTIC RESPONSE OF AGED ASPHALT CEMENTS

Accession Number:

00211349

Record Type:

Component

Abstract:

THE VISCOELASTIC RESPONSE OF AGED AND UNAGED ASPHALT CEMENTS AT 32 F WAS INVESTIGATED. IS HAS BEEN KNOWN THAT AGING OF ASPHALT CEMENTS RESULTS IN AN INCREASE IN VISCOSITY AND DEGREE OF NON-NEWTONIAN BEHAVIOR. HOWEVER, THE RELATIVE CHANGE IN VISCOSITY ALONE IS NOT SUFFICIENT TO CHARACTERIZE THE DURABILITY OF ASPHALT CEMENTS AND THE RESPONSE OF THESE MATERIALS UNDER SEVERE TEMPERATURES AND LOADING CONDITIONS. TO ANALYZE AGING PHENOMENA FROM A VISCOELASTIC POINT OF VIEW, CYLINDRICAL ASPHALT SPECIMENS WERE SUBJECTED TO A CREEP TEST AND STRAIN-TIME DATA WERE OBTAINED. USING CURVE- FITTING TECHNIQUES, THE VISCOELASTIC PARAMETERS CHARACTERIZING AGED AND UNAGED ASPHALTS AT THE SELECTED TEMPERATURE WERE CALCULATED. THE DYNAMIC RESPONSE OF THE ASPHALTS WAS OBTAINED BY TRANSFORMING THE STRAIN-TIME DATA INTO FREQUENCY DOMAINS. THE VISCOELASTIC ANALYSIS INDICATES THAT AGING RESULTS IN THE DEVELOPMENT OF AN INITIAL ELASTIC DEFORMATION MECHANISM AND AN INCREASE IN THE COEFFICIENT OF VISCOUS TRACTION. SIMILARLY, IT IS SHOWN THAT THE STORAGE MODULUS AND PHASE ANGLE ARE GREATLY AFFECTED BY AGING CONDITIONS. DUE TO THE LIMITATIONS OF A STANDARD AGING INDEX, TO INCLUDE THE EFFECT OF AGING ON OTHER DEFORMATION MECHANISMS, A DYNAMIC AGING INDEX IS PROPOSED AND ITS MERITS ARE DISCUSSED. THE RESULTS OF CHEMICAL ANALYSIS AND RHEOLOGICAL AND DURABILITY TESTS ON THESE ASPHALTS ARE ALSO PRESENTED. /AUTHOR/

Supplemental Notes:

Paper sponsored by Committee on Characteristics of Bituminous Materials and presented at the 47th Annual Meeting. 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 #:

01410176

Authors:

Majidzadeh, Kamran
Schweyer, Herbert E

Pagination:

pp 50-61

Publication Date:

1968

Serial:

Highway Research Record

Issue Number: 231
Publisher: Highway Research Board

Media Type:

Print

Features:

Figures (7) ; References (23) ; Tables (5)

Uncontrolled Terms:

Dynamic response; Phase angle; Strain rate

Old TRIS Terms:

Subject Areas:

Freight Transportation; Highways; Materials; Terminals and Facilities

Files:

TRIS, TRB

Created Date:

Oct 14 1994 12:00AM

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