Method of Modifying of Mineral Fillers for Asphalt Concrete by Calcium Polysulfide

Abstract

The method of modifying the surface of grains of mineral filler for asphalt concrete with calcium polysulphides is presented in the paper. Calcium polysulfide solution has been proposed for the expansion of the mineral resource base in the production of asphalt concrete aggregates, which breaks down into elemental sulphur and calcium hydroxide in the course of filler modification. The proposed modifier reduces the temperature coefficient for the bitumen-mineral binder by 1.8 times. The structure of the composite of highly filled mixtures based on modified filler has higher properties compared to mixtures based on classical filler: compressive strength at temperature 0°C – up to 33.5 %; Compressive strength at a temperature of 20 °C – up to 84 %; Compressive strength at a temperature of 50 °C – up to 34.3 %.