Softening of asphalts in dilute solutions at primary distillation conditions
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Softening of asphalts in dilute solutions, often by as much as 50 percent, occurred in several instances during experiments using a modified Roto-vap recovery technique. The softening is caused by a mechanism that is characterized by Fourier transform infrared spectroscopy spectral growth near the traditional carbonyl region associated with oxidative hardening, as well as other minor changes. Gel permeation chromatograms of solvent-softened asphalts show formation of one and sometimes two new narrow peaks, suggesting that the reactions produce a very narrow range of products. Reaction rates vary considerably with asphalt source, solvent, and solution conditions.
Transportation Research Record
author list (cited authors)
Burr, B. L., Davison, R. R., Glover, C. J., & Bullin, J. A.
complete list of authors
Burr, BL||Davison, RR||Glover, CJ||Bullin, JA