|
|
|
Title: RHEOLOGICAL AND RHEO-OPTICAL CHARACTERIZATION OF ASPHALT CEMENT AND EVALUATION OF RELAXATION PROPERTIES
Accession Number: 00669041
Record Type: Component
Availability: Find a library where document is available Abstract: The rheological properties of asphalt depend on its molecular structure and chemical composition. The widely used Corbett fractions provide the composition of asphalt but lack the detailed structure/property relationships needed to accurately design asphalt systems. Depending on the proportions of the generic fractions, an asphalt is either a dispersed type or a solution type. The dispersed type is also termed micellar or colloidal; the solution type is termed "polymer type". The literature is unclear as to which structure accurately represents the mechanical behavior of an asphalt system. Material science tools are used to elucidate the structure of asphalt. In particular, a rheo-optical technique was developed and used to probe changes in molecular vibrations via Fourier transform infrared spectroscopy (FTIR) during shear deformation. The objective is to identify the important chemical aspects of an asphalt molecule that are related to the deformation properties of the asphalt. To clarify this relationship, detailed viscoelastic characterization of the asphalt was conducted to ensure an understanding of the asphalt's rheological properties. The FTIR results suggest an important link between rheological performance and linear structures in the asphalt cement complex. This concept was further probed through small-angle X ray scattering. Fractal analysis was used to determine the Porod scattering dimension, which is a measure of the dimensionality of the tested structure (i.e., whether it is linear or branched, or three-dimensionally branched.
Supplemental Notes: This paper appears in Transportation Research Record No. 1436, Asphalt Concrete Mix Materials. 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: Monograph Accession #: 01401249
Language: English
Authors: Little, Dallas NLetton, AlanPRAPNNACHARI, SKim, Y RichardPagination: p. 71-82
Publication Date: 1994-10
Serial: ISBN: 030905513X
Features: Figures
(9)
; Photos
(2)
; References
(26)
; Tables
(4)
TRT Terms: Uncontrolled Terms: Old TRIS Terms: Subject Areas: Highways; Materials; I31: Bituminous Binders and Materials
Files: TRIS, TRB
Created Date: Nov 23 1994 12:00AM
More Articles from this Serial Issue:
|
