MODIFICATION OF PETROLEUM BITUMEN WITH RUBBER-POLYMER COMPOSITES

Abstract

This research paper is devoted to the problem of modification of petroleum bitumen by rubber-polymer composites. The purpose of the study is to improve the rheological and physico-mechanical properties of bitumen of domestic brands PBR 70/100 and PBR 100/130 for the development of new generation road binders adapted to the climatic conditions of Kazakhstan. 

The paper considered the effectiveness of composites based on used automobile tires and rubber-polymer composites based on polymer waste such as polyethylene and polypropylene. The literature review analyzes domestic and foreign studies of the composition and properties of bitumen, its improvement by polymers, rubber crumb and composite modifiers. 

In the experimental part, the softening temperature, penetration, extensibility, Fraas brittleness temperature, viscosity, and elastic recovery parameters of primary and modified bitumen were determined. The results showed that devulcanized rubber crumb and composite modifiers such as ELTC significantly improve the performance properties of bitumen. 

In the conclusion of the study, optimal compositions were proposed to increase the strength of road surfaces in the sharply continental climate of Kazakhstan. In addition, the environmental and economic efficiency of recycling used tires and polymer waste was demonstrated.