Bezbabicheva O. Improvement of concrete bridge decks waterproofing on automobile roads.

The subject: the waterproofing of bridge decks on highways and flyovers. The objective: design improvement of reliable waterproofing protection of concrete bridges with regard to technological features of waterproofing and paving. Methods: field observations, analytical, experimental research of physical and mechanical properties of waterproofing materials, numerical analysis, statistic processing of experimental research results, cost efficiency evaluation. Facilities: computer, deep chilling table НСЛ -259/70, tensile-testing machine. Theoretical and empirical results: the model for determination of deflected mode of waterproofing layer under simultaneous impact of live load and negative temperatures has been developed. Mathematical model of process of thermal action on the waterproofing layer when putting protective layer and hot asphalt pavement has been developed. It allowed determination of relationship between temperature change history of waterproofing layer when putting hot or mastic asphalt of different thickness. The research results have been applied when developing application software for the computation of required heat resistance of bridge waterproofing materials as well as recommendations and standards. Novelty: notions of deflected mode of waterproofing layer in pavement construction on concrete bridges have been supplemented; analytical ratios for determination of value and duration of thermal action on waterproofing material when putting hot asphalt mixes have been obtained for the first time; the selection of indexes of waterproofing materials properties taking into account design and technological features of concrete bridge decks waterproofing protection has been improved. Implementation: the recommendations have been developed and results of the thesis have been implemented when waterproofing bridge decks over the Khotomlia, the Kharkov and the Dnister rivers. Research outcome has been applied when developing the standards: П-Г.1-218-113-97 “Technical regulations of repair and maintenance of Ukrainian highways” (1997); ВБН В.2.3-218-197-2005 “Design and waterproofing of concrete bridges”. Application area: in road organizations of State Stock Company “Automobile roads of Ukraine” when designing and reconstructing concrete bridges on automobile roads