A modeling approach which allows predicting the linear viscoelastic behavior of bitumen blends from the linear viscoelastic properties of individual constituents is presented in this paper. This approach consists in a combination of the Tsenoglou rule for miscible viscoelastic materials with the Palierne model for viscoelastic emulsions. Based on some simple assumptions, this combination predicts satisfactorily the rheological behavior of asphaltite-modified bitumens and, consequently, it can be used for dosage purposes. Beyond asphaltite-modified bitumens, the modeling approach developed here can be applied on reclaimed asphalt-modified bitumens, polymer-modified bitumens, and on blends of partially miscible polymers presenting a suspended droplet morphology.