STABILITY OF MODIFIED BINDERS ON BASIS OF OXIDIZED AND RESIDUAL BITUMENS TO THERMODESTRUCTIONS

The paper analyses the influence of the method for obtaining petroleum road bitumen on the stability of their structure. Stability evaluation is carried out by studying the resistance of the structure to destructive processes. The main features of the thermo-oxidative aging processes occurring in oxidized and residual compounded road bitumen are considered. The modeling of the thermo-oxidative aging process is carried out by the TFOT method. Studies of the degradation of binders are carried out over a long period of time, the evaluation of destructive processes in bitumen is obtained by different methods was carried out by means of a differential method. The characters of the change in the properties of bitumen after aging are established. The contribution of the raw material (oxidized and residual bitumen) of the polymer-bitumen binder to its resistance to thermal and oxidative aging is studied. The complex effect of the raw material on the properties characterizing the quality of the modified binder and its resistance to degradation is made using the multicriteria optimization method. Specific quality criteria has been developed that take into account the structural sensitivity to destruction and the direction of changes in properties modified by the polymer, which binds after thermal oxidative aging. Optimization is carried out according to the generalized criterion of structural stability, the form of which takes into account the features of the optimized object and the direction of the change in properties.