Кузло, М. Т. та Гуйван, Є. Ф. та Kuzlo, M. T. та Guivan, E. F. (2021) ОЦІНКА СТАНУ ІСНУЮЧОГО ДОРОЖНЬОГО ОДЯГУ НА ДІЛЯНКИ АВТОМОБІЛЬНОЇ ДОРОГИ. Вісник Національного університету водного господарства та природокористування (1(93)). с. 417-427.

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Анотація

Наведено дослідження технічного стану автомобільної дороги державного значення Н-25 Городище – Рівне – Старокостянтинів на ділянці км 175+950 – км 178+000. Встановлено конструктивні параметри існуючого дорожнього одягу. Виконано оцінку міцності дорожнього одягу для прийняття обґрунтованих проектно- конструктивних рішень з підсилення існуючих шарів.

Title in English

ASSESSMENT OF THE CONDITION OF EXISTING ROAD CLOTHES ON SECTIONS OF THE ROAD

English abstract

The study of the state importance’s highway technical condition H-25 Horodyshche – Rivne – Starokostiantyniv on the section km 175 + 950 – km 178 + 000 has been given. Full-scale studies have been performed to identify such types of deformations of existing roadway covering as gauge up to 5 cm, a grid of cracks in the road surface, transverse temperature cracks. The structural layers of the existing pavement, their composition and deformation characteristics have been established on the basis of the performed field and laboratory studies. It has been found that the upper layer of asphalt pavement is characterized by a high content of binder, which has significantly lost its binder properties and is characterized by low values of deformation characteristics (1020–910 MPa). The strength of the roadway clothing structure has been checked according to the criterion of elastic deflection. Estimation of the strength of pavement has been based on the premises that the stressstrain state of the roadway clothing under load is described by the solutions of the linear elasticity theory for a layered half-space, taking into account the conditions of layers’ connection at the contacts. At the same time, the forces of inertia due to their small size have not been taken into account in the calculations. The marginal condition of roadway clothing has been characterized by indicators that depend on the material properties of each layer of pavement and the soil of the ground, as well as on their location and working conditions in the construction. It is established that the existing design of roadway clothing in this area does not meet the condition of strength for the allowable elastic deflection. Recommendations for strengthening the layers of existing pavement have ben elaborated , namely: - taking into account that the lower existing layer of asphalt concrete has significantly lost its strength, then deformation and binding properties must be completely replaced; - in case of partial replacement of the existing asphalt concrete it is recommended to arrange an additional structural layer with a complex binder (for example, cement + bitumen emulsion), 12 - 20 cm thick, in order to reduce the load on it and to prevent significant heating during the process of laying the upper asphalt concrete layers; - by using crushed existing asphalt concrete (granulate), it is recommended to add road mixtures C7 or C8 for mixing in mobile or stationary unitswith a complex binder (for example, cement + bitumen emulsion).

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