PHYSICO-CHEMICAL PROPERTIES OF FIRE-PROTECTIVE PLYWOOD  UNDER HIGH TEMPERATURES

Sergii Pozdieiev; Yana Zmahа; Mykola Zmahа; Inna Nedilko; Svitlana Fedchenko

doi:10.31731/2524-2636.2021.5.1.129.132

Sergii Pozdieiev Cherkassy Institute of Fire Safety Named after Chernobyl Heroes of National University of Civil Defense in Ukraine
Yana Zmahа Cherkassy Institute of Fire Safety Named after Chernobyl Heroes of National University of Civil Defense in Ukraine
Mykola Zmahа Cherkassy Institute of Fire Safety Named after Chernobyl Heroes of National University of Civil Defense in Ukraine
Inna Nedilko Cherkassy Institute of Fire Safety Named after Chernobyl Heroes of National University of Civil Defense in Ukraine
Svitlana Fedchenko Cherkassy Institute of Fire Safety Named after Chernobyl Heroes of National University of Civil Defense in Ukraine

DOI: https://doi.org/10.31731/2524-2636.2021.5.1.129.132

Keywords: fire-retardant plywood, mathematical modeling, fire temperature, fire propagation, field methods

Abstract

In the given article the received results of researches of physical and mechanical properties of fire-retardant plywood for facing of wooden beams as means of fire protection are processed.

The regularities of the influence of flame retardant impregnation in 2-mm birch veneer on the fire-retardant properties of 10 mm and 20 mm thick plywood have been established. It is established that fire-retardant veneer treatment increases the density of the obtained plywood, which in turn changes the physical and chemical properties of plywood, and compression is reduced, which partially saves wood raw materials, as the required thickness of 10 mm is obtained due to fewer veneer sheets.

The processes of heat exchange and heat and mass transfer occurring in veneer, which depend on the parameters of these processes (temperature, time, amount of moisture) and thermophysical properties of veneer, which are determined by thermal conductivity, specific thermal, thermal conductivity, thermogradient mass diffusion.

In addition, plywood belongs to the material, the decay and combustion of which under appropriate conditions is carried out in the form of decay, due to the structural properties of veneer sheets and gluing systems, it should be emphasized that in terms of chemical process we have identified patterns of rheological properties and rheokinetic parameters filled with epoxy compositions of protective plywood. The results of fire tests show that the content of flame retardant, in accordance with the requirements for impregnation (120, 5 kg / m3) in the veneer, has a positive effect not only on fire resistance but also on the depth of charring for different time intervals.