00625140

Component

http://onlinepubs.trb.org...trr/1992/1342/1342-006.pdf

https://scholar.google.co...olds&publication_year=1992

The study of a set of 20 asphalt cements reported in a recent publication is modified and extended to cover additional parameters and a precise statistical evaluation of correlations. For a given asphalt, the whole, original material is subjected to high performance gel permeation chromatography (HPGPC) using a gravimetric finish. The experimental conditions used are kept uniform for all molecular size distribution (MSD) analyses in this study. Another part of asphalt is fractionated by ASTM D 4124. Each Corbett fraction is subjected to HPGPC analysis. The asphaltene compatibility index (ACI) is determined as proposed by Branthaver et al. A part of original asphalt is subjected to 16-hr TFOT, and MSD of the aged sample is determined. Two asphalts from the same refinery showed MSD and ACI data that are outliers with respect to the other 18 asphalts. For many correlations, excluding these two asphalts causes the correlation coefficient, r, to change appreciably because r is not resistant (i.e., one or more extreme entries can be influential). Several correlations are evaluated. Depending on the number of asphalts involved, n, the numerical value of r indicates whether a correlation is not significant, significant, or highly significant; the sign of r indicates the direction of slope of the regression line. Considering only the significant and highly significant correlations, the sign of associations tested indicate that a high LMS/MMS ratio [the molecular size index (MSI)] for original asphalt accompanies a low ACI, a minimum temperature susceptibility, a high resistance to aging (minimum change of MSI due to 16-hr TFOT), and a high viscosity, 135 deg C. From the MSD of original asphalt, eight with the highest MSI show common parameters that predict a promising field performance.

This paper appears in Transportation Research Record No. 1342, Asphalt and Asphalt Additives. 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

01404979

English

p. 35-49

1992

Transportation Research Record

030905205X

References (25) ; Tables (18)

Asphalt cement; Correlation analysis; Forecasting; Fractions; Gel permeation chromatography; Molecular structure; Oven tests; Performance; Physicochemical properties; Thin films; Viscosity

Field performance; High performance; Thin film oven test

Data and Information Technology; Highways; Materials; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Oct 20 1993 12:00AM

• COLD IN-PLACE RECYCLING FOR REHABILITATION AND WIDENING OF LOW-VOLUME FLEXIBLE PAVEMENTS IN INDIANA
• EVALUATION OF AGING CHARACTERISTICS OF ASPHALTS BY USING TFOT AND RTFOT AT DIFFERENT TEMPERATURE LEVELS
• EVALUATION OF NEW GENERATION OF ANTISTRIPPING ADDITIVES
• GAP-GRADED COLD ASPHALT CONCRETE: BENEFITS OF POLYMER-MODIFIED ASPHALT CEMENT AND FIBERS
• IN SITU COLD RECYCLING OF BITUMINOUS PAVEMENTS WITH POLYMER-MODIFIED HIGH FLOAT EMULSIONS
• REACTION RATES AND HARDENING SUSCEPTIBILITIES AS DETERMINED FROM PRESSURE OXYGEN VESSEL AGING OF ASPHALTS
• RELATING ASPHALT ABSORPTION TO PROPERTIES OF ASPHALT CEMENT AND AGGREGATE
• STABILITY OF STRAIGHT AND POLYMER-MODIFIED ASPHALTS
• STUDY OF THE EFFECTIVENESS OF STYRENE-BUTADIENE RUBBER LATEX IN HOT MIX ASPHALT MIXES
• SUMMARY OF ASPHALT ADDITIVE PERFORMANCE AT SELECTED SITES
• USE OF ASPHALT EMULSIONS FOR IN-PLACE RECYCLING: OREGON EXPERIENCE