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.

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