The phenol-cresol-formaldehyde resin (PhCR-F) obtained from phenolic fraction of coal tar has been synthesized via the polycondensation method of "raw" phenols with formaldehyde. The modification of road bitumen by this resin was carried out. PhCR-F in different concentrations was found to be effectively used as a modifier of road bitumen. It was shown that PhCR-F is an effective adhesive additive for road bitumen. The structural types of the oxidized and modified bitumen were determined according to the group-chemical composition and calculated criteria.
Abstract. Three commercial road emulsions on the basis of petroleum bitumens differing by their production method (oxidated, distillation and modified bitumens) and Redicote E-11 emulsifier were obtained. The obtained emulsions were used for the production of Slurry Seal and thin-layer road coatings on its basis. The coatings based on modified oxidated bitumen have more advantages compared with those based on oxidated bitumen. The expensive distillation bitumen may be exchanged for modified oxidative one to use it in a Slurry Seal technology. We propose to use the indene-coumarone resin for oxidated bitumen modification to improve its adhesive and cohesive properties.
The road slow-setting monophase cationic bitumen emulsions have been prepared from bitumen modified by coumarone-indene resin with epoxy groups. Еmulsions were obtained using a colloid mill at the standard temperatures (413-423 K). The physicotechnical parameters of modified monophase emulsions have been established and the comparative analysis with the bas е sample has been made.
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