Rieznik O. Designing highways in areas with an increased risk of aquaplaning

The dissertation is devoted to the design of highways in areas with an increased risk of aquaplaning. The composition of the porous asphalt concrete mixture for the arrangement of the upper layer of the coating from porous asphalt concrete has been developed, the optimality of its composition and the determined physical and mechanical properties have been experimentally confirmed. Carried out researches on determination of transport and operational indicators on sections of highways with an increased level of aquaplaning hazard - strength, equality and coefficient of clutch. The design of road clothing with the arrangement of the upper layer of the coating from porous asphalt concrete and the basalt continuous sheet of the CSB-R (soaked) layer between the layers has been improved. The mathematical model for preventing the occurrence of aquaplaning in road sections with asphalt concrete coatings taking into account the factors and physical processes occurring on the coating in the presence of a water layer with the definition of the critical speed of the car on a wet surface has become further developed. At the same time, in the mathematical model, the following values are taken into account: the speed of vehicles, in which the occurrence of the phenomenon of aquaplaning may occur; the critical thickness of the liquid layer, which will give rise to the aquaplaning phenomenon; angle of the wheel of a car. An improved mathematical model for estimating the influence of road surface irregularities on the speed of aquaplaning with the determination of the dependence of the distance and time of throwing wheels from the coating state. It was investigated that the physicomechanical properties of CSB-R solid basalt canvas fully comply with the requirements of normative documents. This made it possible to use this material to remove excess water from the road structure and to reinforce the top layer of the coating from porous asphalt concrete. According to the results of calculating the effectiveness of reinforcing a road construction with a coating of porous asphalt concrete with a basalt solid sheet of the mark CSB-R (soaked) revealed that the reinforced road construction increases its durability and reliability by 2.5 times. On the research site of the Lviv-Ternopil motorway (km 60 + 500 - km 62 + 700), the leveling depth measurements of the water layer depth on the coating and measurements of the speeds of different types of vehicles have been carried out. It is confirmed that the actual water distribution curve on the coating is subject to the law of normal distribution. New experimental dependences of the critical speed of motion, in which the occurrence of the aquaplaning phenomenon occurs, is obtained from the critical thickness of the water layer