Optimization of Asphalt Concrete Coatings: Advances in Activation and Hydrophobization of Mineral Powders

Objective . The objective of the study is to assess the influence of various methods of processing mineral powders on the formation of high-quality and long-term characteristics of asphalt concrete pavements. The article covers the topic of production and application of activated and hydrophobized mineral powders in asphalt concrete pavements. Method . The method includes a search and theoretical analysis, as well as the systematization of existing Russian and foreign studies. Result . The practical experience of using mineral powders has been studied, the main attention is paid to the differences in processing methods, their influence on the characteristics of asphalt concrete and the determination of the optimal conditions for the use of each method for the needs of the transport and road complex as a filler. Research has shown that any type of impact on mineral powder for asphalt concrete, whether activation or hydrophobization, significantly increases its reactivity with bitumen. Chemical activation of mineral powder improves the mechanical properties and resistance of asphalt concrete to chemical reagents, while by means of hydrophobization of fillers it is possible to significantly increase the frost resistance of the composite and its resistance to water erosion. Conclusion . The choice of method and composition for treating mineral powder should be determined by the individual operating conditions of asphalt pavements. Each method is potentially promising, but it exhibits its maximum properties only in specific operational circumstances.