## 5 Conclusions  
Based on the experimental research conducted, the following conclusions were reached:  
1. Modifiers for the hydrophobic effect of the bituminous coating formed the series (in decreasing order): AG-4I \(>\) AC-1 \(>\) AMDOR-10. The maximum increase in the contact angle of wetting with water falls on their concentration of 1 g/dm\({}^{3}\). In comparison with unmodified bitumen (\(\theta\) = 95.05\({}^{\circ}\)), the wetting angle increased by 12.25\({}^{\circ}\) (AG-4I), by 8.16\({}^{\circ}\) (AC-1), and by 6.76\({}^{\circ}\) (AMDOR-10). 2. The hydrophobic effect of additives was determined by the degree of shielding of the bitumen surface by hydrophobic regions of surfactant molecules. This process was determined by the length, the branching of the hydrocarbon radical, and the number of hydrocarbon chains of additives. The concentration of surfactants at the \"bitumen-air\" interface showed a decrease in surface tension relative to unmodified bitumen (\(\Delta\sigma\)): 4.59 mN/m (AC-1), 4.08 mN/m (AG-4I), and 0.68 mN/m (AMDOR-10). 3. A close correlation was found between the hydrophobizing effect of modifiers in bitumen and the water resistance of modified asphalt concrete. The minimum water saturation of asphalt concrete samples was recorded at the same concentration of all  
Figure 6: Nomogram of the dependence of the water saturation index of asphalt concrete on the contact angle of wetting with water of modified bitumen films. Concentration of AG-4I (C\({}_{\rm AG-4I}\)): 1, 0 g/dm\({}^{3}\); 2, 0.5 g/dm\({}^{3}\); 3, 1.0 g/dm\({}^{3}\); 4, 1.5 g/dm\({}^{3}\); 5, 2.0 g/dm\({}^{3}\). studied additives (C = 1 g/dm\({}^{3}\)), at which the maximum contact angle of wetting with water \(\theta\) (min \(\cos\theta\)) was observed. 4. With the content of modifiers 1 g/dm\({}^{3}\), the best results were achieved in the presence of AG-4I: water saturation decreased by 1.96 times (relative to the base variant without AG-4I) and amounted to 4.02%. The water saturation of asphalt concrete with the introduction of nitrogen-containing modifiers was at the levels of 4.85% (AC-1) and 4.92% (AMDOR-10). 5. The addition of AC-1 to the \"bitumen-AG-4I\" system shifted the contact angle of wetting to higher values, with a maximum at C\({}_{\text{AG-4I}}\) = 1 g/dm\({}^{3}\) and C\({}_{\text{CAS-1}}\) = 1 g/dm\({}^{3}\). At these concentrations, the change in the contact angle of wetting by 20.85\({}^{\circ}\) in comparison to unmodified bitumen was an additive value (\(\theta_{\text{c}}\) = 115.46\({}^{\circ}\) and \(\theta_{\text{ex}}\) = 115.90\({}^{\circ}\)), which ensured maximum shielding of the solid surface from water. 6. The simultaneous presence of AG-4I and AC-1 in the binder at their optimal ratio (C\({}_{\text{AG-4I}}\) = 1 g/dm\({}^{3}\) and C\({}_{\text{AC-1}}\) = 1 g/dm\({}^{3}\)) led to a deeper decrease in the water saturation of asphalt concrete samples W = 3.05% than that of their individual use. 7. A close correlation was revealed between the hydrophobicity of modified bitumen and the water saturation of asphalt concrete. Generalized equations and a graphical representation of a function of several variables allowed for optimizing compositions by the content of AG-4I and AC-1 modifiers to achieve the required performance properties of asphalt concrete coatings. 8. The additives we offer can be used as effective modifiers to increase the hydrophobicity of asphalt concrete pavements. The water repellency of the two modifiers AG-4I and AC-1 manifested itself at the maximum level when they were introduced simultaneously into bitumen-mineral compositions in the optimal ratio. Additive AC-1 is obtained from petrochemical waste, which is undoubtedly a cost-effective factor, and the use of waste sealing liquid AG-4I is expedient from the point of view of environmental protection. Conceptualization, A.D. and Y.B. ; methodology, A.D. and Y.B. ; software, K.O. ; validation, A.D. and K.O. ; formal analysis, A.L. ; investigation, A.D. and Y.B. ; resources, Y.B.