Regulation of Bitumen Properties by Two-Stage Omdation

Resumo

Oxidation of paraffinic tar in two stages at different temperatures is proposed for regulating the physicochemical properties of the oxidized bitumens. The oxidation temperature is shown to be one of the decisive factors in forming an oxidized bitumen product with a hydrocarbon group composition that conforms to state standard requirements. The adhesion indicator, thermal oxidative properties, and cohesive strength of the bitumens can be improved by adjusting the first- and second-stage oxidation temperatures. The dependence between the adhesion indicator and maximal tensile strength is used for a preliminary estimate of the adhesive properties of oxidized bitumens produced by two-stage oxidation of the studied feedstock.