Lignin-based bio-asphalt

The present invention relates to a composition comprising bitumen; optionally vegetable oil or derivative thereof; and a lignin preparation, wherein the lignin preparation is characterized by a lignin purity of 60-100 wt.% with respect to the weight of the lignin preparation; and a lignin average molecular weight of 1000-5000 g/mol. The composition may be an asphalt binder composition or asphalt composition. Accordingly, the present invention also relates to a paving or roofing comprising the composition of the invention.Further, the present invention relates to a method of preparing an asphalt composition, comprising mixing bitumen with filler material, adding lignin preparation and vegetable oil to the mixture obtained, preferably wherein the lignin preparation and the vegetable oil are added simultaneously.