Wollastonite-based asphalt concrete

Abstract

Developing an asphalt concrete composition with improved physical, mechanical and operational characteristics is an urgent issue all over the world. To improve the asphalt mix proportion, reinforcing components are added to its composition. An advanced reinforcing filler is wollastonite. The research aim: to study the possibility of utilizing wollastonite concentrate instead of traditional limestone fillers in the asphalt mix proportion and to determine its effect on the durability of the road surface. The objects of the study are some samples of asphalt concrete with a different quantitative ratio of wollastonite fillers and various types of crushed aggregate. Research methods: in accordance with standard techniques, the physical and mechanical characteristics of the samples were determined. Research results: the optimum amount of wollastonite concentrate for the asphalt concrete composition was found; the improvement of physical and mechanical characteristics of asphalt concrete due to the applying of wollastonite concentrate was acknowledged; the optimum roadway surfacing that consists of several layers was developed.