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- W604055275 abstract "This paper presents data on the asphaltene content of samples manufactured between 1956 and 1991. Asphaltene content appeared to reduce in the period studied and this was attributed to the change from mainly air blown bitumens to mainly PPA bitumens. Air blowing and addition of PPA are two means by which soft bitumen residue from a refinery vacuum distillation column is hardened to a viscosity level suitable for paving use. The change from blown to PPA bitumens resulted in a change in temperature susceptibility , with PPA bitumens showing a larger change in viscosity with temperature than blown bitumens. Other chemical properties will be addressed in future work. Among the most important is bitumen durability. This test has been correlated with seal life, and any reduction in durability test value could result in reduced seal lives and a substantial increase in the cost of periodic maintenance. (a) For the covering entry of this conference, please see ITRD abstract no. E213757." @default.
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- W604055275 date "2005-01-01" @default.
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- W604055275 title "The asphaltene content of Australian bitumens" @default.
- W604055275 hasPublicationYear "2005" @default.
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