Abstract
Oxidation of bitumen with air or oxygen at various temperatures significantly alters the composition of the material and markedly reduces asphaltene solubility. Similar and, in many instances, more noticeable effects are produced in the presence of metal salts. Throughout the various processes, oxygen incorporation usually occurs into those fractions which are relatively high in hetero-atom (nitrogen, oxygen and sulphur) content. Spectroscopic examination of the products allows feasible representation of the predominant pathways of bitumen oxidation as well as possible modes of asphalt deterioration.
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