00637514

Monograph

http://onlinepubs.trb.org...nepubs/shrp/SHRP-A-649.pdf

In this study new techniques for the uniform measurement of fluorescence intensity and spectra were developed and applied to the characterization of 13 raw asphalts. Analytical techniques and some of the factors which influence asphalt fluorescence were considered. It was found that as viscosity increased, the fluorescence intensity decreased, a relationship thought to be due to the dependence of both these properties upon oxidation and/or molecular structuring. Flourescence intensity also decreased significantly upon the mixing of aggregate materials with asphalt, the magnitude of the changes being influenced more by asphalt binder than the aggregate. As observed for raw asphalts, the fluorescence intensity of asphalt binders in contact with different aggregate materials decreased with curing/aging time. Study results show that fluorometric measurement of asphalt intensity has a great potential for use in monitoring asphalt oxidation occurring at the hot-mix plant and during lay-down, as well as a technique to monitor the deterioration of asphalt pavements that are in service.

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SHRP-A-649

English

85 p.

1993-6

Appendices (1) ; Figures; Tables

Aggregates; Asphalt; Asphalt pavements; Asphalt plants; Binders; Durability; Fluorescence; Microscopy; Monitoring; Pavements

Geotechnology; Highways; Materials; Pavements; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Oct 1 2000 12:00AM