Viscoelastic measurements of bitumens made on a mechanical spectrometer assisted with bitumen-again characteristics, adsorption of bitumen components on mineral surfaces, and the effect of moisture on the bitumen components on mineral surfaces, and the effect of moisture on the bitumen-aggregate interactions. Irregular transitions believed related to changes in molecular structuring in bitumens were observed in the viscoelastic and asphaltene settling times data following time-dependent oxidative aging of the bitumens.