Bruyev M. Fire-protective elements raising of the wood construction by antipyrine impulsive impregnation.

The object is fire protection of wood construction ele- ments. The aim of the study is to improve the fire barrier of wood construction elements using pulse percolation by fire-retardants. Research approaches. To achieve the aim set in the study mathematical and experimental methods of investigations were used. The mathematical simulation of liquid and gas percolation into pore medium was made using the finite difference method. To investigate the fire barrier rate of specimens the method of fire barrier effi- ciency determination by GOST 12.1.044-89 was used. To analyze the experimental results the methods of statistical processing were used. The novelty consists in the fact that for the first time the effect of rising the fire barrier of wood construction elements at pulse percolation by fire- retardants by means of high (more than 85%) density of wood pore space filling is proved; this effect provides achievement of "Hard Combustible" Group with the per- colation depth which is 20-30% less than usi ng the known methods. Practical importance and realization. The method of deep percolation of wood construction elements by fire-retardants allows to reduce temporary (more than 5 times as large) and economic (more than 2 times as large) inputs on processing of this elements and to provide the higher quality of element percolation in comparison with the conventional methods. Results of the study are imple- mented in KP "Kharkivspetsservis" (Kharkov), Design and Research Institute "Kharkivs'kyj PromstrojNDIproekt", and Research and Planning-and-Design Institute "Mol- niya" (Kharkov).