https://sci.ldubgd.edu.ua/jspui/handle/123456789/13075 2026-04-07T04:19:39Z 2026-04-07T04:19:39Z Веселівський, Роман Богданович Смоляк, Дмитро Володимирович Яковчук, Роман Святославович Петровський, Віталій Львович Гаврись, Андрій Кагітін, Олександр https://sci.ldubgd.edu.ua/jspui/handle/123456789/14739 2024-11-15T11:58:21Z 2024-04-17T00:00:00Z

Title: Environmentally safe installation for determining the fire resistance of coatings and fire resistance tests of small fragments building structures Authors: Веселівський, Роман Богданович; Смоляк, Дмитро Володимирович; Яковчук, Роман Святославович; Петровський, Віталій Львович; Гаврись, Андрій; Кагітін, Олександр Abstract: Actuality. Taking into account fire statistics, the task of preventing the occurrence and spread of fires is urgent. It is obvious that the fire resistance of building structures, which must be taken into account at the design stage, is of the greatest importance and influence on the development and spread of fires in buildings and structures. Conducting fire experiments makes it possible to obtain the most complete information about the behavior of building structures under fire effects, however, the scale of field tests, labor-intensiveness, energy consumption and damage to the environment prompts the search and development of alternative methods that would ensure the environmental friendliness of the tests, compliance with the conditions of the experiment ( standard fire temperature regime), and at the same time would make it possible to estimate the limit of fire resistance of a building structure in reduced dimensions or to experimentally determine the fire-resistant ability (efficiency) of fire-resistant coatings. Purpose. The main goal of the article is rationale use of an installation for determining the fire-resistant capacity (efficiency) of fire-resistant coatings and fire resistance tests of small-sized fragments of building structures, taking into account the reduction of the harmful load on the environment. Main results. Research has been carried out and the design features of the installation have been substantiated, the principle of which is to heat the inner space of the chamber with the help of electric heating elements, which, unlike liquid fuel (diesel fuel, fuel oil, gas), do not harm the environment. A control unit-module of variable voltage regulation designed to regulate the heating temperature of the radiation panel in the test chamber has been developed. The design of the created test setup makes it possible to increase or decrease the temperature on the heating surface of the test sample, not only with the help of the heating temperature regulator, but also in manual mode, by moving the test sample closer or further away from the radiation panel along the guides. Conclusions. According to the results of experimental tests, it was established that the chamber of the installation warms up uniformly and according to the standardized temperature-time dependence Ts = 345lg (8t+1)+20). At the same time, the temperature regulation process using BP-10 with triac output ensures stable operation of electric heating elements up to temperatures of 1000 °C. A feature of the created installation is the possibility of additional lowering or raising of the temperature on the heating surface of the experimental sample, in case of its deviation during the experiment, by means of approaching or moving away from the sample to the heating panel. The conducted studies confirm the necessary reproducibility of experimental results.

2024-04-17T00:00:00Z Веселівський, Роман Богданович Смоляк, Дмитро Володимирович Яковчук, Роман Святославович Петровський, Віталій Львович https://sci.ldubgd.edu.ua/jspui/handle/123456789/14738 2024-11-15T11:54:49Z 2024-03-28T00:00:00Z

Title: МЕТОДИКА ДОСЛІДЖЕННЯ ВОГНЕЗАХИСНОЇ ЗДАТНОСТІ ВОГНЕЗАХИСНОГО ПОКРИТТЯ НА ОСНОВІ ПОЛІСИЛОКСАНУ ТА ОКСИДІВ АЛЮМІНІЮ, ТИТАНУ І ХРОМУ ДЛЯ СТАЛЕВИХ БУДІВЕЛЬНИХ КОНСТРУКЦІЙ Authors: Веселівський, Роман Богданович; Смоляк, Дмитро Володимирович; Яковчук, Роман Святославович; Петровський, Віталій Львович Abstract: Fires and their negative consequences are a significant problem today. The final report of the World Fire Statistics Centre in 2023 shows that an average of 3.7 million fires occurred annually between 1993 and 2021. The fire resistance of building structures has paramount importance and influence on the development and spread of fires in buildings and structures, which needs consideration at the design stage. Particular attention should be paid to metal structures when used in construction since their fire resistance limit is about 15 minutes, depending on the profile and cross-section of the structure, and this, in turn, limits their use in buildings and structures where the fire resistance class of structures is REI 15. A way to increase the fire resistance class of a steel building structure is its fire protection implemented using dedicated means that protect the steel structure from the effects of high fire temperatures. The study aims to develop a methodology and determine the heating time of prototypes of steel plates with a fire-retardant coating based on polysiloxane and oxides of aluminium, titanium, and chromium to a critical temperature depending on the coating thickness (0.3, 0.45, 0.6, 0.8 mm) and the thickness of the steel plate (0.3, 0.5, 0.8 cm). To determine the fire protection capacity of the developed fireproof coating, we used the method regulated by clause 7.4 of DSTU-N-P B V.1.1-29:2010 ‘Fireproof treatment of building structures. General requirements and control methods’. The authors have developed a methodology for conducting experimental studies of the effectiveness of fire protection coatings using an installation for determining the fire protection capacity (effectiveness) of fire protection coatings, the principle of which is to heat the interior of the installation chamber using electric heating elements. The heating time of the prototypes of steel plates with the developed fire protection coating to the critical temperature was determined, depending on the coating thickness and the thickness of the steel plate. We found that the extreme temperature in a steel plate with a thickness of 0.3 cm is reached at 23, 34, and 46 minutes with a coating thickness of 0.3, 0.45, and 0.6 mm, respectively. Experimental studies of steel plates with thicknesses of 0.5 and 0.8 cm have shown that with an increase in plate thickness at the same values of the thickness of the fire protection coating, the time to reach the extreme temperature increases by about 1 minute. At a coating thickness of 0.8 mm, for steel plates with thicknesses of 0.3 and 0.8 cm, the temperature on the unheated surface of the prototype did not reach the extreme value. Given the results obtained, it will be relevant to solve the inverse problem of thermal conductivity to determine the thermal and physical characteristics of the coating based on numerical data from experimental studies.

2024-03-28T00:00:00Z Веселівський, Роман Богданович Смоляк, Дмитро Володимирович https://sci.ldubgd.edu.ua/jspui/handle/123456789/14737 2024-11-15T11:50:48Z 2024-03-27T00:00:00Z

Title: ЕКСПЕРИМЕНТАЛЬНІ ДОСЛІДЖЕННЯ ВОГНЕЗАХИСНОЇ ЗДАТНОСТІ РЕАКТИВНОГО ВОГНЕЗАХИСНОГО ПОКРИТТЯ НА СТАЛЕВІЙ ПЛАСТИНІ РОЗМІРОМ 500Х500 мм ТОВЩИНОЮ 0,3 см Authors: Веселівський, Роман Богданович; Смоляк, Дмитро Володимирович Abstract: EXPERIMENTAL STUDIES OF FIRE PROTECTION CAPACITY OF REACTIVE FIRE PROTECTION COATING ON STEEL PLATE SIZE 500X500 mm THICKNESS 0.3 cm. Experimental studies were carried out and the heating time of a prototype steel plate (0,3 cm thick) with a fireproof coating based on polysiloxane and oxides of aluminum, titanium, and chromium was determined to a critical temperature depending on the coating thickness (0,3, 0,45, 0,6, 0,8 mm).

2024-03-27T00:00:00Z