Abstract
The dependences of the adhesive properties and pH of bitumen of various oxidation depths and tar, raw materials of bitumen production, depending on the aging time are investigated. It is shown that in bitumen, with an increase in the depth of oxidation during CBT, a change in the type of oxo compounds formed and, as a consequence, adhesive properties occurs. In high-melting bitumen, during aging, there is an intensive formation of asphaltenes, resins and asphaltogenic acids, which allow to improvethe adhesive properties of the binder. Low-melting bitumen is characterized by intensive formation of carboxyl and hydroxyl groups of compounds that reduce adhesion to alkaline mineral materials. It is established that the rate of tar aging increases, and for oxidized bitumen it is extreme, where the maximum values are observed in the first hours of aging. It is proposed to use the adhesion index and acidity in combination with the standard quality indicator - the softening temperature after aging to select the component composition of bitumen obtained using the "oxidation-compounding" technology, as well as to develop methods to reduce the aging rate of bitumen in the initial period of operation of asphalt concrete coatings and to improve their quality and durability.
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