Increasing pavement bitumen adhesion with DAD adhesion additives

Abstract

An important factor that largely determines the water resistance and durability of asphalt pavements is the adhesion of bituminous binders to the surface of stone materials. The most common method of increasing the adhesion of binders is the use of adhesive additives. Given that the range of adhesives used in the road industry is con-stantly updated, and their effectiveness is determined by the characteristics of binders and stone materials, issues related to the assessment of the impact of additives on the properties and, in particular, the adhesion of bituminous binders, are relevant. Goal. The aim of the study was to evaluate the effects of adhesive additives of the DAD series on the proper-ties of bitumen used in the road industry of Ukraine. Methodology. For bitumen modified with DAD-1, DAD-K and DAD-KT 2 additives, standard quality indicators have been determined in accordance with the norms of national standards DSTU 4044 and SOU 45.2-00018112-067. Particular attention was paid to determining the adhesive properties of binders, which were evaluated by the method of adhesion to the glass surface and the method of rotation of the bottle, and the thermal stability of additives is evaluated by changes in adhesion after aging of binders by TFOT and RTFOT. Based on the obtained experimental data, it was found that the adhesion additives of DAD have practically no effect on the basic standard quality indicators of road viscous bitumen. When modifying bitumen with the maximum concentrations recommended by the manufacturer, the additives significantly increase the adhesion of bitumen to the glass surface. The surface of the grains of the ac-cepted stone materials treated with bitumen modified with the additive DAD-KT 2, after the test by the method of rotation of the bottle for 6 hours showed 40% of them remain covered with binder. Novelty. The thermal stability of DAD adhesive additives significantly depends on the accepted method of aging. The main factor that reduces the adhesive properties of the DAD-1 additive is the intense interaction with air. The adhesion properties of bitumen modified with the addition of DAD-CT 2 is significantly increased after aging. Practical value. The expediency and efficiency of the use of additives of the DAD series in the production of asphalt concrete mixtures should be established based on the characteristics of the bitumen and stone materials used.