EXTINGUISHING EFFECT MECHANISM OF FAST-HARDENING FOAMS ON THE BASIS OF STRUCTURED SILICA PARTICLES
PURPOSE. A new approach for assessing extinguishing effect mechanism of fast-hardening foams on the basis of structured silica particles has been considered. 
METHODS. On the basis of the conducted theoretical research, mechanism dynamics of diffusion combustion of solid combustible materials on the basis of thermophysical and mass-exchanged combustion process model has been studied. Fire-extinguishing effect mechanism by means of conventional extinguishing media in comparison with fast-hardening foam has been considered. Theoretical substantiation for combustion termination mechanism of solid combustible materials has been presented. In the process of studying the shielding ability of fast-hardening foams the analytical method to assess the impact of the specific heat values on the measured heat conductibility coefficient under all other equal conditions has been used. 
FINDINGS. The research studies proved that fast-hardening foam is superior to regular fire-extinguishing media, namely: it surpasses water not less than 50 times and foam on the basis of a foam concentrate AFFF type - 15 times. 
RESEARCH APPLICATION FIELD. It's reasonable to use the research results in extinguishing forest fires, fires of agricultural grounds, urban and rural dwelling houses, specific fire explosive facilities dealing with storage, processing and transportation of explosives and materials. 
CONCLUSIONS. A new technology to prevent fires and explosions at the objects of the Russian Federation using fast-hardening foam on the basis of structured silica particles has been developed. The technology includes the following extinguishing agent: specialized two-component composite for fire extinguishment. Fast-hardening foam in a solidified state possesses high adhesive properties without being decomposed even at a temperature higher than 1 000 °С.