The problem of monolithic behavior of a metal pipe and fiberglass safety cage has been considered in the article. The prestressed case does not only decrease the deformability of a pipe on-load but it also protects metal from corrosion. The ability to withstand the arising stresses has been investigated for both strip fiberglass reinforcement and the whole construction. It has been shown that the deformability of fiberglass depends on the kind of binder. The maximum strength value has been obtained while gluing glass fibers with butvar-phenolic glue. The calculated rupture strength coefficient of strip fiberglass reinforcement and the analysis of monolithic behaviour of metal and reinforcement proved the precondition as to the plasticity of a developed material. The process of force transmission between a steel pipe and fiberglass at ductile stage has been analyzed in the article. While forecasting the work of a pipe on-load, it is necessary to take into account nonlinearity of metal-fiberglass pipe properties.
The article analyzes in detail the results of the performed reconstruction works with the application of thermosetting polymers. The method of adhesive anchoring of reinforcement rods with fixing them in the concrete body with acrylic glue was carried out on transport infrastructure facilities (railway steam shop and railway itinerary post). It has been determined that strengthening the foundation with application of the thermosetting polymers (adhesive anchor joints) gives a significant reduction in the consumption of concrete, metal and labor costs. The advantage of such acrylic adhesives is the possibility of varying the ratio of monomeric and polymeric part (powder) containing redox system, within acceptable concentrations, without significant changes in adhesion and cohesion parameters. The obtained results are very important in practice, because in the conditions of preparation of the adhesive (especially in construction conditions) it is difficult to determine the exact number of components. The experimental research data can be used for attachment joints projecting and industrial technological lines development, as well as for further polymeric adhesive materials, widely applied in industrial and civil engineering, improvement.
The composition material for waterproofing of the railway infrastructure objects, in particular, culvert pipes is suggested in the article. The waterproof composition contains an acrylic polymer and a filler. The comparison of the composition properties with two kinds of the fillers (silica sand and Portland cement) is carried out. The following properties are defined – water absorption, corrosion stability, stability in an aggressive environment, frost resistance to evaluating the suitability of the proposed composition for waterproofing. These properties are determined for three batches: an acrylic polymer without a filler, an acrylic polymer with silica sand, and an acrylic polymer with Portland cement. The test results show that the composition with silica sand possesses the best waterproofing properties. Wherein the quantity of silica sand is 1.5 mass parts to the quantity of polymer. Compared to the non-filled acrylic polymer the offered composition is characterised less water absorption, more significant corrosion stability and stability in an aggressive environment, better frost resistance. The mix with Portland cement shows a bit worse results at a higher cost of the material in whole.
Харківський національний університет міського господарства ім. О.М. Бекетова Міцність при згині із площини та міцність при розтягу вздовж волокон залежить від характеристичної міцності дошок при розтягу вздовж волокон, їх коефіцієнту варіації і кількості дошок як системи, або ефективного поперечного перерізу ПКД панелі навантажений вздовж волокон. На сьогонішній день виконані дослідження з оцінки міцності при розтягу вздовж волокон ПКД панелей, але відсутні коефіцієнти, що враховують можливе розподілення навантаження аналогічного для міцності при згині із площини панелі. Нехтування шарами поперечних дошок при визначенні площі перерізу нетто Anet підкреслює раціональність впровадження неоднорідної структури панелі виходячи з класу міцності дошок, аналогічно до комбінованої клеєної деревини для балок, де дошки високих класів міцності розташовуються у верхній і нижній чверті або третині поперечного перерізу. Показана у цій роботі методологія для розрахунку міцності неоднорідних ПКД панелей показує свою ефективність, яка призводить до оптимізації і економії матеріалу. Ортогональна структура склеєних дошок у ПКД панелі при стиску поперек волокон призводить до показників міцності та
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