Phenolytical modification of polyurethane elastomers as a method of obtaining multifunctional additives for road coal tar bitumen

Abstract

Modification of road bitumen by introducing multifunctional additives was studied in the article. Local domestic and industrial wastes of polyurethane polymers were used as a raw material for obtaining such additives. In order to determine the optimal conditions for modification and selection of effective reagent for the process the method of probabilistically deterministic of planning of experiment was applied. Optimal parameters of phenolytical modification of mixture of polyurethane elastomers for the purpose of synthesis of additives for road asphalt bitumen blends were found on the basis of the experimental data processing. Comparison between two methods for the preparation of bituminous mixtures allowed concluding that the introduction of the modifier directly at the beginning of the heat treatment of the parent material is more appropriate in the production of modified coal tar bitumen. The carried on tests of physical and mechanical properties of modified coal tar bitumen showed that the use of synthesized modifier allows significantly expanding the range of high performance and ensuring adhesion properties of the road coal tar bitumen. Conceptual scheme of possible production of modified coal tar bitumen by intensive technology was proposed.