THEORETICAL SUBSTANTIATION OF THE USE OF FLY ASH AS A FILLER IN ASPHALT

Abstract

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. Problem Statement. Ukrainian power generating enterprises generate millions of tons of dusty waste – fly ash - as a result of coal combustion. This material is close in grading the requirements for aggregate according to DSTU B V.2.7-121 and can probably be used for the production of asphalt mixtures. Purpose. To determine the possibility of using fly ash for the production of asphalt mixtures by analyzing its chemical properties. Materials and methods. During the research, we used aggregate produced by SKALA-PODILSKYI SPECIAL QUARRY LLC and fly ash from Burshtyn TPP.

Keywords

• road