Theoretical Substantiation of the Use of Fly Ash as a Filler in Asphalt

Introduction. Asphalt mixtures are one of the most widely used materials in road construction. For the production of these mixtures, mainly conditioned mineral materials are used – coarse aggregate, fine aggregate and filler, and bitumen is used as a binder. Mineral filer is an important component of the asphalt mixture, which plays a major role in ensuring the quality of asphalt mixtures. The specific surface area of mineral filler is about 90 % of the specific surface area of mineral materials in the asphalt mix. Mineral filler plays two roles in the asphalt mixture: it fills the pores between fine and coarse aggregates and structures the bitumen.