STUDY OF THE INFLUENCE OF MODIFIERS ON THE PROCESSES OF WETTING MINERAL FILLERS AND HYDROPHOBICITY OF BITUMEN FILMS

Abstract

As you know, the quality of asphalt pavement often does not meet the stated standards. The low degree of adhesion between bitumen and mineral material is primarily due to the insufficient ability of bitumen to effectively wet the surface of crushed stone, especially of an acidic nature. The aim of the work is to establish the influence of various modifiers on the wetting processes of bitumen compositions. The methods of the work included the study of the wetting processes of mineral fillers of various nature depending on the quantitative polymer content in bitumen, as well as the study of the regularities of the effect of modifiers on the hydrophobicity of bitumen films. The wetting angle θof the surface was experimentally determined by the lying drop method. Results and discussion: as follows from the analysis of the data obtained, the introduction of AG-4I most effectively contributes to the reduction of the surface tension σlgat the interface of the phases "bitumen composition –gray crushed stone". This is evidenced by the maximum wetting ability of the composition. Conclusion: it was found that of the two polymer modifiers, the spent sealing liquid AG-4I has the maximum effect on the wetting processes of mineral fillers and the hydrophobicity of bitumen films. A narrow range of modifier concentrations (Cmodif= 0.5%) was revealed, at which the water-repellent properties of bitumen compositions are enhanced. A hydrophobic effect comparable to AG-4I provides the introduction of 0.25% calcium chloride into the bitumen composition.