Oxidation of the bitumen can achieve a desired softening point, penetration distance, viscosity, or other suitable characteristics. In an embodiment, the oxidation can be performed such that a combination of the bitumen mixture and the catalyst has a softening point of at least approximately 88° C. (190° F.), at least approximately 90° C. (194° F.), or at least approximately 93° C. (200° F.). In another embodiment, the oxidation can be performed such that a combination of the bitumen mixture has a softening point of not greater than approximately 110° C. (230° F.), not greater than approximately 105° C. (221° F.), or not greater than approximately 102° C. (215° F.).
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