Air Blowing of Supercritical Asphalt Fractions
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- 作者：Nikolai Y. Vassiliev ; Richard R. Davison ; Shelly A. Williamson ; and Charles J. Glover
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2001
- 出版时间：April 4, 2001
- 年：2001
- 卷：40
- 期：7
- 页码：1773 - 1780
- 全文大小：95K
- 年卷期：v.40,no.7(April 4, 2001)
- ISSN：1520-5045
文摘
Air blowing of asphalt at higher temperature does not greatly impact such parameters as thesoftening point-penetration relationship. With new Superpave specification, very good gradeasphalts can be produced by air blowing, and the blowing temperature does not seriously impactthe grade span. It is shown, however, that the subsequent 88 
C hardening and oxidation ratesare higher for materials blown at higher temperature, and this is not detected by Superpavespecifications. Blowing fluxes with high saturate content may result in higher grade but cancause subsequent susceptibility to oxidative hardening. The mechanism by which air blowingcan affect the 88 C hardening rate is related to oxidation kinetics and the tendency of oxidationproducts to form asphaltenes, causing hardening. For some materials air blown at highertemperature, the subsequent accelerated hardening rate results from an increase in the oxidationrate, while the hardening susceptibility may actually decrease.
C hardening and oxidation ratesare higher for materials blown at higher temperature, and this is not detected by Superpavespecifications. Blowing fluxes with high saturate content may result in higher grade but cancause subsequent susceptibility to oxidative hardening. The mechanism by which air blowingcan affect the 88 C hardening rate is related to oxidation kinetics and the tendency of oxidationproducts to form asphaltenes, causing hardening. For some materials air blown at highertemperature, the subsequent accelerated hardening rate results from an increase in the oxidationrate, while the hardening susceptibility may actually decrease.